CAN COMMUNICATION SYSTEM DIAGNOSIS SYSTEM

CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION (for LHD)

The systems (ECUs and sensors) that use CAN communication vary depending on the vehicle and optional equipment. Check which systems (ECUs and sensors) are installed to the vehicle.

GTS display and installed systems

Tech Tips

The names of ECUs and sensors shown on the GTS display may differ from those shown in DTC Table by ECU.

Connected to	Code	ECU/Sensor Name	GTS Display	Applicability
-	CGW	Central gateway ECU (network gateway ECU)	-	Installed on all vehicles
-	DLC3	DLC3	-	Installed on all vehicles
Bus 1	BSM	Blind spot monitor sensor LH	Blind Spot Monitor Master	Vehicles with Blind Spot Monitor System
	CS	Clearance warning ECU assembly	Clearance Warning (Clearance Sonar)	Vehicles with TOYOTA Parking Assist-sensor System
	F-CAM	Forward recognition camera	Front Camera Module	Vehicles with Toyota Safety Sense
	F-MR	Millimeter wave radar sensor assembly	Front Radar	Vehicles with Toyota Safety Sense
Bus 2	S&S	Engine Stop and Start ECU	Stop and Go/Start	Vehicles with Stop and Start System
Bus 2	ENG	ECM	ECM (Engine)	Installed on all vehicles
Bus 3	AV	Radio and display receiver assembly	Display and Navigation (AVN)	Vehicles with Radio and Display Type
Bus 3	DCM	Telematics transceiver	DCM	Vehicles with Manual (SOS) Switch
Bus 4	STR	Steering sensor	Spiral cable (Steering Angle Sensor)	Installed on all vehicles
	EPS	Power steering ECU assembly	Power Steering (EPS)	Installed on all vehicles
	BRK	Brake actuator assembly	Skid Control (ABS/VSC/TRC)	Installed on all vehicles
	SRS	Airbag sensor assembly	Airbag	Installed on all vehicles
	AWD	4WD ECU assembly	Four Wheel Drive Control	Vehicles with AWD
Bus 5	A/C	Air conditioning amplifier assembly	Air Conditioning Amplifier	Installed on all vehicles
	SMT	Certification ECU (smart key ECU assembly)	Certification (Smart)	Vehicles with Entry and Start System
	MB	Main body ECU (multiplex network body ECU)	Main Body	Installed on all vehicles
	MET	Combination meter assembly	Combination Meter	Installed on all vehicles
	LIT	Headlight ECU sub-assembly LH	Headlight swivel (AFS)	Vehicles with LED Headlight

CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION (for RHD)

The systems (ECUs and sensors) that use CAN communication vary depending on the vehicle and optional equipment. Check which systems (ECUs and sensors) are installed to the vehicle.

GTS display and installed systems

Tech Tips

The names of ECUs and sensors shown on the GTS display may differ from those shown in DTC Table by ECU.

Connected to	Code	ECU/Sensor Name	GTS Display	Applicability
-	CGW	Central gateway ECU (network gateway ECU)	-	Installed on all vehicles
-	DLC3	DLC3	-	Installed on all vehicles
Bus 1	BSM	Blind spot monitor sensor LH	Blind Spot Monitor Master	Vehicles with Blind Spot Monitor System
	CS	Clearance warning ECU assembly	Clearance Warning (Clearance Sonar)	Vehicles with TOYOTA Parking Assist-sensor System
	F-CAM	Forward recognition camera	Front Camera Module	Vehicles with Toyota Safety Sense
	F-MR	Millimeter wave radar sensor assembly	Front Radar	Vehicles with Toyota Safety Sense
Bus 2	S&S	Engine Stop and Start ECU	Stop and Go/Start	Vehicles with Stop and Start System
Bus 2	ENG	ECM	ECM (Engine)	Installed on all vehicles
Bus 3	AV	Radio and display receiver assembly	Display and Navigation (AVN)	Vehicles with Radio and Display Type
Bus 4	STR	Steering sensor	Spiral cable (Steering Angle Sensor)	Installed on all vehicles
	EPS	Power steering ECU assembly	Power Steering (EPS)	Installed on all vehicles
	BRK	Brake actuator assembly	Skid Control (ABS/VSC/TRC)	Installed on all vehicles
	SRS	Airbag sensor assembly	Airbag	Installed on all vehicles
	AWD	4WD ECU assembly	Four Wheel Drive Control	Vehicles with AWD
Bus 5	A/C	Air conditioning amplifier assembly	Air Conditioning Amplifier	Installed on all vehicles
	SMT	Certification ECU (smart key ECU assembly)	Certification (Smart)	Vehicles with Entry and Start System
	MB	Main body ECU (multiplex network body ECU)	Main Body	Installed on all vehicles
	MET	Combination meter assembly	Combination Meter	Installed on all vehicles
	LIT	Headlight ECU sub-assembly LH	Headlight swivel (AFS)	Vehicles with LED Headlight

Description of "Communication Bus Check" Screen

Note

The following communication bus check screen is provided only as an example. This screen differs from the actual screen for this vehicle.

Tech Tips

The ECUs and sensors that are normally connected to the CAN communication system are displayed on the GTS.

Select "Communication Bus Check" on the menu screen of the GTS.

CAN Bus Check

Tech Tips

If items are not selected correctly in the vehicle specification pop up screen, the name of the CAN junction connector to which the ECUs or sensors are connected may not be displayed on the "Communication Bus Check" screen.
Confirm that the "Communication Bus Check" screen is displayed and the ECUs and sensors that are normally connected to the CAN communication system are displayed.
Tech Tips
- Even if an ECU or sensor that is connected to a bus that is monitored by a bus monitoring ECU (gateway function equipped ECU) is not communicating, it will remain displayed on the "Communication Bus Check" screen.
- When an ECU or sensor that is connected to a bus that is not monitored by a bus monitoring ECU (gateway function equipped ECU) is not displayed on the "Communication Bus Check" screen, it means that it is not communicating.

The default display setting selected on the combo box is ALL. When checking for ECUs or sensors for a specific bus, choose the bus from the drop down list. ALL, each bus, each sub bus and Central Gateway are listed in the drop down list.

Combo box

Background color is red or yellow

Item	Detail
Combo box: ALL	Displays all ECUs and sensors connected to the central bus and sub buses.
Combo box: Bus	Displays ECUs and sensors connected to the selected bus.
Combo box: Sub bus	Displays ECUs and sensors connected to the selected sub bus.
Combo box: Central Gateway	Displays all ECUs and sensors connected to the central bus.

Note

When using the combo box, it may be possible to select a sub bus from the drop down list that does not have any connected ECUs or sensors. This is not a malfunction and occurs when there is no optional device connected to a sub bus which is monitored by a sub bus monitoring ECU (gateway function equipped ECU).
In the drop down list, all sub buses applicable to the model are displayed (e.g. LIN communication sub buses are also displayed). For information on sub buses necessary to diagnose the CAN communication system, refer to System Diagram.

Click here

Tech Tips

The background color of an ECU or sensor changes according to its connection status as indicated in the following table.

Description of "Communication Bus Check" Screen
Bus Type	Background Color	Connection Status
Bus	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS.4 No ECUs or sensors are connected to the bus.5
Sub bus with a gateway function equipped ECU that does not memorize connected ECUs or sensors*2	White	Communication has been normal since the start of the CAN bus check.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Communication stop has continued since the start of the CAN bus check.*1
Sub bus with a gateway function equipped ECU that memorizes connected ECUs and sensors*3	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The gateway function equipped ECU cannot communicate with the central gateway ECU.6 No ECUs or sensors are connected to the sub bus.7

Gateway function equipped ECUs relay signals between ECUs and sensors connected to different buses.
*1: An ECU or sensor is installed to the vehicle but is not displayed on the "Communication Bus Check" screen.
*2: The gateway function equipped ECU does not memorize ECUs and sensors connected to its respective sub bus.
*3: The gateway function equipped ECU memorizes ECUs and sensors connected to its respective sub bus.
*4: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS, the name of buses, sub buses, ECUs and sensors will not be displayed.
*5: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.
*6: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.
*7: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.
If there is no communication between the GTS and the vehicle, or no ECUs or sensors are displayed as connected, check the central gateway ECU (network gateway ECU) and diagnosis bus (the bus that connects the DLC3 to the central gateway ECU (network gateway ECU)) for malfunctions.

Monitor the screen for any ECU or sensor connection status changes for a period of 2 minutes.
Tech Tips
- If an open occurs in one of the wires of a CAN branch line, it may interfere with the communication of other ECUs or sensors resulting in an incorrect state being displayed.
- If the connection status changes intermittently during the inspection, repair the open in the branch line of the ECU or sensor that is not communicating, and then perform Communication Bus Check again.

Description of "Communication Bus Check (Detail)" Screen

Note

The following communication bus check screen is provided only as an example. This screen differs from the actual screen for this vehicle.

Tech Tips

The communication error history of ECUs or sensors which have communication error history can be displayed on the "Communication Bus Check (Detail)" screen.

Select "Communication Bus Check" on the menu screen of the GTS.

CAN Bus Check

Tech Tips

If items are not selected correctly in the vehicle specification pop up screen, the name of the CAN junction connector to which the ECUs or sensors are connected may not be displayed on the "Communication Bus Check" screen.
Select "Detail" on the "Communication Bus Check" screen.

*a Communication Bus Check (Detail) - -
Confirm that the "Communication Bus Check (Detail)" screen is displayed and the communication error history of the ECUs or sensors up to present is displayed.
Tech Tips
- Lost Communication Time and Lost Communication Trip are only displayed for the central bus.
- Lost Communication Time and Lost Communication Trip are not displayed for sub buses.

Combo box

Background color is red

Item	Detail
Combo box: ALL	Displays all ECUs and sensors connected to the central bus and sub buses.
Combo box: Bus	Displays ECUs and sensors connected to the selected bus.
Combo box: Sub bus	Displays ECUs and sensors connected to the selected sub bus.
Combo box: Central Gateway	Displays all ECUs and sensors connected to the central bus.
Bus Monitoring ECU	Displays the gateway function equipped ECU which monitors the selected bus or sub bus.
Current Trip	Displays the total number of trips up to now*
Lost Communication Time(s)	Displays the longest period of time in seconds that the ECU or sensor connected to the central bus was not communicating.
Lost Communication Trip	Displays the trip in which the longest period of time that the ECU or sensor connected to the central bus was not communicating occurred.

*: If the component has been replaced with a new one, the total number of trips after the replacement is displayed.

Note

The Lost Communication Time column displays the longest period of time in seconds that the central gateway ECU (network gateway ECU) detected a communication stop in the respective ECU or sensor.
The Lost Communication Trip column displays the trip in which the central gateway ECU (network gateway ECU) detected the longest communication stop in the respective ECU or sensor.
When using the combo box, it may be possible to select a sub bus from the drop down list that does not have any connected ECUs or sensors. This is not a malfunction and occurs when there is no optional device connected to a sub bus which is monitored by a sub bus monitoring ECU (gateway function equipped ECU).
In the drop down list, all sub buses applicable to the model are displayed (e.g. LIN communication sub buses are also displayed). For information on sub buses necessary to diagnose CAN communication system, refer to the System Diagram.

Click here

Tech Tips

The background color of an ECU or sensor changes according to its connection status as indicated in the following table.

Description of "Communication Bus Check (Detail)" Screen
Bus Type	Background Color	Connection Status
Bus	White	Either of the following: Communication has been normal. Lost Communication Time is below 6 seconds.
	Red	Lost Communication Time is 6 seconds or more.
	Not displayed	Either of the following: The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS.1 No ECUs or sensors are connected to the bus.2
Sub bus	White	Lost Communication Time is displayed as "-".
Sub bus	Not displayed	Either of the following: The gateway function equipped ECU cannot communicate with the central gateway ECU.3 No ECUs or sensors are connected to the sub bus.4

If there is no communication between the GTS and the vehicle, or no ECUs or sensors are displayed as connected, check the central gateway ECU (network gateway ECU) and diagnosis bus (the bus that connects the DLC3 to the central gateway ECU (network gateway ECU)) for malfunctions.
Lost Communication Time and Lost Communication Trip are not displayed for sub buses.
*1: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS, the name of buses, sub buses, ECUs and sensors will not be displayed.
*2: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.
*3: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.
*4: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.

Communication Bus Check (Communication Malfunction Check)
Tech Tips

DTCs related to CAN communication are displayed for each ECU on the GTS.
1. Select "Communication Bus Check" on the menu screen of the GTS.
  
  CAN Bus Check
2. Select "Communication Malfunction Check" on the "Communication Bus Check" screen.
  
  *a Communication Malfunction Check - -
3. Confirm that the "Communication Malfunction Check" screen is displayed and CAN communication DTCs for each ECU are displayed.
  
  Tech Tips
  
  When there are no CAN communication DTCs stored, no DTCs will be displayed.

How to Use "Communication Bus Check" Screen in Inspection

Note

The following CAN bus wiring diagram or communication bus check screen is provided only as an example. This wiring diagram or screen differs from the actual one for this vehicle.

Tech Tips

If the CAN communication system is currently malfunctioning, it is recommended to use Communication Bus Check rather than Communication DTCs for determining the suspected area.
Turn the ignition switch to ON, or perform the necessary operations to reproduce the problem symptom, select "Communication Bus Check" and wait approximately 2 minutes. Check the communication status of each ECU or sensor on the screen while performing this operation.

If the CAN communication system is currently malfunctioning, determine the suspected area through Communication Bus Check as follows:

Problem Symptoms Table
Problem Symptom Pattern	Display on Communication Bus Check Screen	Suspected Area
A	Almost all of the ECUs and sensors connected to the malfunctioning CAN bus are displayed as not communicating on the "Communication Bus Check" screen.	Short between CAN bus lines (CANH and CANL) Short to +B in a CAN bus line (CANH or CANL) Short to ground in a CAN bus line (CANH or CANL)
B	ECUs or sensors farther from the central gateway ECU (network gateway ECU) than the open in the wires are displayed as not communicating on the "Communication Bus Check" screen.	Open in both wires of a main bus line in the central bus
C	One ECU or sensor is displayed as not communicating on the "Communication Bus Check" screen.	Open in both wires of a branch line connected to an ECU or sensor in the central bus Internal malfunction of an ECU or sensor in the central bus Malfunction in the power supplied to an ECU or sensor in the central bus
D	No ECUs or sensors are displayed on the "Communication Bus Check" screen.	Internal malfunction of the central gateway ECU (network gateway ECU) Malfunction in the power supplied to the central gateway ECU (network gateway ECU) Open in both wires of the branch line in the diagnosis bus (DLC3 - Central gateway ECU (network gateway ECU)) Short between CAN bus lines (CANH and CANL) in the diagnosis bus (DLC3 - Central gateway ECU (network gateway ECU)) Short to +B in a CAN bus line (CANH or CANL) in the diagnosis bus (DLC3 - Central gateway ECU (network gateway ECU)) Short to ground in a CAN bus line (CANH or CANL) in the diagnosis bus (DLC3 - Central gateway ECU (network gateway ECU))
E	One ECU or sensor is displayed as not communicating in multiple buses on the "Communication Bus Check" screen.	Internal malfunction of an ECU or sensor connected to multiple buses Malfunction in the power supplied to an ECU or sensor connected to multiple buses
F	Some ECUs or sensors are displayed as not communicating in the central bus and other ECUs or sensors are displayed as not communicating in a sub bus.	Open in a wire of a branch line connected to an ECU or sensor in the central bus Internal malfunction of an ECU or sensor in the central bus
G	A gateway function equipped ECU is displayed as not communicating in the central bus and ECUs and sensors connected to its respective sub bus are not displayed.	Open in both wires of a branch line connected to a gateway function equipped ECU Internal malfunction of a gateway function equipped ECU Malfunction in the power supplied to a gateway function equipped ECU
H	One ECU or sensor is displayed as not communicating in a sub bus on the "Communication Bus Check" screen.	Open in both wires of a branch line connected to an ECU or sensor in a sub bus Internal malfunction of an ECU or sensor in a sub bus Malfunction in the power supplied to an ECU or sensor in a sub bus
I	ECUs or sensors farther from the sub bus monitoring ECU (gateway function equipped ECU) than the open in the wires are displayed as not communicating on the "Communication Bus Check" screen.	Open in both wires of a main bus line in a sub bus

Problem Symptom Pattern A

Details of Malfunction

Short between CAN bus lines (CANH and CANL) in Bus 2
Short to +B in a CAN bus line (CANH or CANL) in Bus 2
Short to ground in a CAN bus line (CANH or CANL) in Bus 2

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red

Tech Tips

Due to the malfunction, almost all of the ECUs and sensors connected to Bus 2 will be displayed as not communicating and their background color will be red.
The malfunction in Bus 2 will not affect the other buses.
The malfunctioning part can be determined by inspecting for an open in the main bus line, a short between bus lines or a short to +B or ground.
Make sure to perform the inspection to measure resistances of buses to determine the cause of the malfunction.

Details of Malfunction

Short between CAN bus lines (CANH and CANL) in Bus 4
Short to +B in a CAN bus line (CANH or CANL) in Bus 4
Short to ground in a CAN bus line (CANH or CANL) in Bus 4

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red
*g	Not displayed	-	-

Tech Tips

Due to the malfunction, almost all of the ECUs and sensors connected to Bus 4 will be displayed as not communicating and their background color will be red.
The malfunction will not affect the other buses of the central bus. However, the sub bus connected to Bus 4 is likely to be affected. The gateway function equipped ECU connected to Bus 4 will not communicate and consequently the sub bus and its respective ECUs or sensors monitored by the gateway function equipped ECU (sub bus monitoring ECU) will not be displayed, indicating that the gateway function equipped ECU is not communicating with the central gateway ECU (network gateway ECU).
The malfunctioning part can be determined by inspecting for an open in the main bus line, a short between bus lines or a short to +B or ground.
Make sure to perform the inspection to measure resistances of buses to determine the cause of the malfunction.

Problem Symptom Pattern B

Details of Malfunction

Open in both wires of the main bus line between the CGW and No. 1 CAN junction connector in Bus 2

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red

Tech Tips

Due to the malfunction, almost all of the ECUs and sensors connected to Bus 2 will be displayed as not communicating and their background color will be red.
The malfunction in Bus 2 will not affect the other buses.
The malfunctioning part can be determined by inspecting for an open in the main bus line.
Make sure to perform the inspection to measure resistances of buses to determine the cause of the malfunction.

Details of Malfunction

Open in both wires of the main bus line between the No. 1 CAN junction connector and No. 1 CAN junction connector in Bus 2

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red

Tech Tips

Due to the malfunction, ECUs or sensors farther from the CGW than the open in the wires will be displayed as not communicating and their background color will be red.
The malfunction in Bus 2 will not affect the other buses.
The malfunctioning part can be determined by inspecting for an open in the main bus line.
Make sure to perform the inspection to measure resistances of buses to determine the cause of the malfunction.

Details of Malfunction

Open in both wires of the main bus line between the No. 1 CAN junction connector and ENG in Bus 2

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red
*g	Pattern 1	*h	Pattern 2

Tech Tips

Even when the same part of the main bus line is open, depending on internal electrical noise which changes according to the position of the open in the line, the information displayed on the "Communication Bus Check" screen may differ.
In pattern 2, the information displayed may be the same as when there is an open in both wires in the main bus line between the No. 1 CAN junction connector and No. 2 CAN junction connector, which may make it difficult to determine the malfunctioning part.
The malfunction in Bus 2 will not affect the other buses.
Make sure to perform the inspection to measure resistances of buses to determine the cause of the malfunction.

Problem Symptom Pattern C

Details of Malfunction

Open in both wires of the branch line connected to F-MGC in Bus 2

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red

Tech Tips

The information displayed on the "Communication Bus Check" screen will be the same for an open in both wires of a branch line, an internal malfunction of an ECU or sensor or a malfunction in the power supplied to an ECU or sensor. In this example, the background color of the malfunctioning ECU or sensor will be red.

Details of Malfunction

Internal malfunction of F-MGC in Bus 2
Malfunction in the power supplied to F-MGC in Bus 2

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red

Tech Tips

Details of Malfunction

Open in both wires of the branch line connected to ENG in Bus 4

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red

Tech Tips

The malfunction in Bus 4 will not affect the other buses.
Due to the malfunction, although ENG is communicating normally with CGW via Bus 2, it is not communicating with CGW via Bus 4. Consequently, it will be displayed as not communicating in Bus 4.

Problem Symptom Pattern D

Details of Malfunction

Internal malfunction of the CGW
Malfunction in the power supplied to the CGW

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Not displayed

Tech Tips

When there is no communication between the GTS and the vehicle, no ECUs or sensors will be displayed.

Details of Malfunction

Open in both wires of the branch lines in the diagnosis bus

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Not displayed

Tech Tips

When there is no communication between the GTS and the vehicle, no ECUs or sensors will be displayed.

Problem Symptom Pattern E

Details of Malfunction

Internal malfunction of BRK
Malfunction in the power supplied to BRK

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red

Tech Tips

The information displayed on the "Communication Bus Check" screen will be the same for an internal malfunction of an ECU or sensor, or a malfunction in the power supplied to an ECU or sensor.

Due to the malfunction, BRK is not communicating with the CGW via both Bus 2 and Bus 4. Consequently, the background color of BRK will be red for both Bus 2 and Bus 4.

Problem Symptom Pattern F

Details of Malfunction

Open in a wire of the branch line connected to HV in Bus 4
Internal malfunction of HV in Bus 4

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red
*g	Background color intermittently becomes yellow or red	*h	Not displayed or background color is yellow or red

Tech Tips

In the "Communication Bus check" screen shown in the illustration, electrical noise in the CAN bus caused by an open in a wire in the branch line connected to HV interferes with the communication of MB causing unstable communication. Also, since MB is a gateway function equipped ECU, communication of ECUs connected to its respective sub bus will also be unstable.
In the "Communication Bus Check" screen shown in the illustration, because the background color of HV is red, it is suspected that HV is the most likely cause of the malfunction. Therefore, it is suspected that HV is not communicating.

Problem Symptom Pattern G

Details of Malfunction

Open in both wires of the branch line connected to MB in Bus 4
Internal malfunction of MB in Bus 4
Malfunction in the power supplied to MB in Bus 4

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red
*g	Not displayed	-	-

Tech Tips

If there is a communication malfunction in a gateway function equipped ECU, ECUs connected to its respective sub bus will also be affected and will not be displayed.
In the "Communication Bus Check" screen shown in the illustration, MB is a gateway function equipped ECU. Therefore, MB is suspected as not communicating.

Problem Symptoms Pattern H

Details of Malfunction

Internal malfunction of MIR-L in the sub bus
Malfunction in the power supplied to MIR-L in the sub bus

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red

Tech Tips

The malfunction in the sub bus will not affect the other buses.
When a gateway function equipped ECU memorizes ECUs and sensors connected to its respective sub bus and there is a communication malfunction in one of the ECUs or sensors, the background color of the ECU or sensor will change to red and the ECU or sensor will remain displayed.
The information displayed on the "Communication Bus Check" screen will be the same for an open in both wires of a branch line, an internal malfunction of an ECU or sensor or a malfunction in the power supplied to an ECU or sensor.

Details of Malfunction

Open in both wires of the branch line connected to MIR-L in the sub bus

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red

Tech Tips

The malfunction in the sub bus will not affect the other buses.
When a gateway function equipped ECU memorizes ECUs and sensors connected to its respective sub bus and there is a communication malfunction in one of the ECUs or sensors, the background color of the ECU or sensor will change to red and the ECU or sensor will remain displayed.
The information displayed on the "Communication Bus Check" screen will be the same for an open in both wires of a branch line, an internal malfunction of an ECU or sensor or a malfunction in the power supplied to an ECU or sensor.

Problem Symptom Pattern I

Details of Malfunction

Open in both wires of the main bus line in the sub bus

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red

Tech Tips

Due to the malfunction, ECUs or sensors farther from the sub bus monitoring ECU (gateway function equipped ECU) than the open in the wires will be displayed as not communicating and their background color will be red.

How to Use "Communication Bus check (Detail)" Screen in Inspection

If the CAN communication system is currently normal but has communication stop history, determine the malfunctioning part using Communication Bus Check (Detail) as follows:
Note
- The following CAN bus wiring diagram or communication bus check screen is provided only as an example. This wiring diagram or screen differs from the actual one for this vehicle.
- The Lost Communication Time column displays the longest period of time in seconds that the central gateway ECU (network gateway ECU) detected a communication stop in the respective ECU or sensor.
- The Lost Communication Trip column displays the trip in which the central gateway ECU (network gateway ECU) detected the longest communication stop in the respective ECU or sensor.
- When using the combo box, it may be possible to select a sub bus from the drop down list that does not have any connected ECUs or sensors. This is not a malfunction and occurs when there is no optional device connected to a sub bus which is monitored by a sub bus monitoring ECU (gateway function equipped ECU).
- In the drop down list, all sub buses applicable to the model are displayed (e.g. LIN communication sub buses are also displayed). For information on sub buses necessary to diagnose CAN communication system, refer to the System Diagram.
  
  Click here
Tech Tips
- If the CAN communication system is currently malfunctioning, it is recommended to use Communication Bus Check rather than Communication Bus Check (Detail) for determining the suspected area.
- The communication error history of ECUs or sensors which have communication error history can be displayed on the "Communication Bus Check (Detail)" screen.
- Lost Communication Time and Lost Communication Trip are only displayed for the central bus.
- Lost Communication Time and Lost Communication Trip are not displayed for sub buses.

If there is an ECU or sensor displayed with a red background on the "Communication Bus Check (Detail)" screen to indicate that it was not communicating, it is suspected that the ECU or sensor was not communicating.

Details of Malfunction

Past malfunction in the wire harness or power supplied to F-MGC in Bus 2

*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction	*f	Background color is red

Description of "Communication Bus Check (Detail)" Screen
Bus Type	Background Color	Connection Status
Bus	White	Either of the following: Communication has been normal. Lost Communication Time is below 6 seconds.
	Red	Lost Communication Time is 6 seconds or more.
	Not displayed	Either of the following: The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS.1 No ECUs or sensors are connected to the bus.2
Sub bus	White	Lost Communication Time is displayed as "-".
Sub bus	Not displayed	Either of the following: The gateway function equipped ECU cannot communicate with the central gateway ECU.3 No ECUs or sensors are connected to the sub bus.4

Tech Tips

Check the values of Lost Communication Trip and Current Trip for the ECUs or sensors that have a red background color.
If the values of Lost Communication Trip and Current Trip are the same for an ECU or sensor, the ECU or sensor is currently not communicating. In this case, it is recommended to use Communication Bus Check rather than Communication Bus Check (Detail) for determining the suspected area.
In the "Communication Bus Check (Detail)" screen shown in the illustration, F-MGC had a communication malfunction in the 10th trip. Thus, it is suspected that F-MGC was not communicating.
*1: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS, the name of buses, sub buses, ECUs and sensors will not be displayed.
*2: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.
*3: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.
*4: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.

DTC TABLE BY ECU

Tech Tips

In the CAN communication system, the CAN communication DTCs of each ECU can be displayed using the GTS.
If CAN communication system DTCs are output, the malfunction cannot be determined only by the DTCs. Perform troubleshooting according to How to Proceed with Troubleshooting.

Click here
If there is a malfunction currently, DTCs can be checked by performing steps in the DTC check procedure.

ECM (for 8NR-FTS) / GTS Display "Engine"

Powertrain > Engine > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Refer to SFI System.

Click here
*2: w/ Differential pressure sensor
*3: w/o Differential pressure sensor

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	Multi-information Display	DTC Storage Method
U010187*1	Lost Communication with TCM Missing Message	The ECM does not receive data from the TCM for approximately 2 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the ECM is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	MIL illuminates.	-	DTC is stored until it is cleared using the GTS.
U010487*2	Lost Communication with Cruise Control Module Missing Message	The ECM does not receive data from the millimeter wave radar sensor assembly for approximately 2 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The dynamic radar cruise control system (vehicle control mode) is operating.	Drive the vehicle at a speed of 40 km/h (25 mph) or more with the cruise control main switch on and operate the dynamic radar cruise control system for approximately 5 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U012587	Lost Communication with Multi-Axis Acceleration Sensor Module	The ECM does not receive data from the airbag sensor assembly for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the ECM is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 2 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U012987	Lost Communication with Brake System Control Module	The ECM does not receive data from the brake actuator assembly for approximately 3 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the ECM is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 5 seconds.	MIL illuminates.	-	DTC is stored until it is cleared using the GTS.
U110387	Lost Communication with Stop and Start Control Module	The ECM does not receive data from the engine stop and start ECU for approximately 3 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the ECM is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 5 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U110487*3	Lost Communication with Cruise Control Module Missing Message	The ECM does not receive data from the millimeter wave radar sensor assembly for approximately 2 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The dynamic radar cruise control system (vehicle control mode) is operating.	Drive the vehicle at a speed of 40 km/h (25 mph) or more with the cruise control main switch on and operate the dynamic radar cruise control system for approximately 5 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

ECM (8NR-FTS) / GTS Display "Transmission"

Powertrain > Transmission > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Refer to Continuously Variable Transaxle System.

for 2WD: Click here
for AWD: Click here

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed	DTC Storage Method
U010087*1	Lost Communication with ECM/PCM "A" Missing Message	The TCM does not receive data from the ECM for approximately 2 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the ECM is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	MIL illuminates.	-	DTC is stored until it is cleared using the GTS.

DTC

Detection Item

DTC Detection Condition

DTC Detection Pre-condition

DTC Check Procedure

Warning Displayed

DTC Storage Method

Indication in Meter

Multi-information Display

U010087*1

Lost Communication with ECM/PCM "A" Missing Message

The TCM does not receive data from the ECM for approximately 2 seconds or more.

Both conditions are met:

The ignition switch is ON for approximately 1 second or more.
The power source voltage of the ECM is 10.5 V or more.

Turn the ignition switch ON and wait for at least approximately 3 seconds.

MIL illuminates.

DTC is stored until it is cleared using the GTS.

ECM (for 3ZR-FAE) / GTS Display "Engine and ECT"

Powertrain > Engine and ECT > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Refer to SFI System.

Click here

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U011B*1	Lost Communication with Rocker Arm Control Module "A"	The ECM does not receive data from the continuously variable valve lift controller assembly for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the ECM is 8 V or more.	Turn the ignition switch ON and wait for at least approximately 2 seconds.	MIL illuminates.	-	DTC is stored until it is cleared using the GTS.
U0124	Lost Communication with Lateral Acceleration Sensor Module	The ECM does not receive data from the airbag sensor assembly for approximately 3 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 10 seconds or more. The power source voltage of the ECM is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 13 seconds.	MIL illuminates.	-	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The ECM does not receive data from the brake actuator assembly for approximately 3 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 10 seconds or more. The power source voltage of the ECM is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 13 seconds.	MIL illuminates.	-	DTC is stored until it is cleared using the GTS.

Brake Actuator Assembly / GTS Display "ABS/VSC/TRC/EPB"

Chassis > ABS/VSC/TRC/EPB > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0073	Control Module Communication Bus Off	A communication error (bus-off status) occurs consecutively for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the brake booster with master cylinder assembly is 9.6 to 16.5 V.	Turn the ignition switch ON and wait for at least approximately 2 seconds.	ABS warning light illuminates. Brake warning light illuminates. Slip indicator light illuminates.	-	DTC is stored until it is cleared using the GTS.
U0100	Lost Communication with ECM/PCM "A"	The brake actuator assembly does not receive data from the ECM for approximately 1 second or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. Vehicle speed is 6 km/h (4 mph) or more. The power source voltage of the brake actuator assembly is 9.6 to 16.5 V.	Drive the vehicle at a speed of 6 km/h (4 mph) or more for approximately 2 seconds or more.	Slip indicator light illuminates. Electric parking brake warning light illuminates. Brake hold operated indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U0123	Lost Communication with Yaw Rate Sensor Module	The brake actuator assembly does not receive data from the airbag sensor assembly for approximately 1 second or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. Vehicle speed is 6 km/h (4 mph) or more. The power source voltage of the brake actuator assembly is 9.6 to 16.5 V.	Drive the vehicle at a speed of 6 km/h (4 mph) or more for approximately 2 seconds or more.	Slip indicator light illuminates. Electric parking brake warning light illuminates. Brake hold operated indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U0124	Lost Communication with Lateral Acceleration Sensor Module	The brake actuator assembly does not receive data from the airbag sensor assembly for approximately 1 second or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. Vehicle speed is 6 km/h (4 mph) or more. The power source voltage of the brake actuator assembly is 9.6 to 16.5 V.	Drive the vehicle at a speed of 6 km/h (4 mph) or more for approximately 2 seconds or more.	Slip indicator light illuminates. Electric parking brake warning light illuminates. Brake hold operated indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The brake actuator assembly does not receive data from the steering sensor for approximately 1 second or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. Vehicle speed is 6 km/h (4 mph) or more. The power source voltage of the brake actuator assembly is 9.6 to 16.5 V.	Drive the vehicle at a speed of 6 km/h (4 mph) or more for approximately 2 seconds or more.	Slip indicator light illuminates. Electric parking brake warning light illuminates. Brake hold operated indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The brake actuator assembly does not receive data from the main body ECU (multiplex network body ECU) approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the brake actuator assembly is 9.6 to 16.5 V.	Turn the ignition switch ON and wait for at least approximately 2 seconds.	Electric parking brake warning light illuminates. Brake hold operated indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U1103	Lost Communication with Stop and Start Control Module	The brake actuator assembly does not receive data from the engine stop and start ECU approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. Vehicle speed is 6 km/h (4 mph) or more. The power source voltage of the brake actuator assembly is 9.6 to 16.5 V.	Drive the vehicle at a speed of 6 km/h (4 mph) or more for approximately 2 seconds or more.	Electric parking brake warning light illuminates. Brake hold operated indicator light blinks.	-	DTC is stored until it is cleared using the GTS.

Power Steering ECU Assembly / GTS Display "EMPS"

Chassis > EMPS > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The power steering ECU assembly does not receive data from the ECM for approximately 5 minutes or more.	All conditions are met: The ignition switch is ON for approximately 3 seconds or more. Vehicle speed is 20 km/h (12 mph) or more. The power source voltage of the power steering ECU assembly is 9 V or more.	Drive the vehicle at a speed of 20 km/h (12 mph) or more for approximately 5 minutes or more.	-	-	DTC remains stored only while malfunction is occurring.
U0129	Lost Communication with Brake System Control Module	The power steering ECU assembly does not receive data from the brake actuator assembly for approximately 3 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the power steering ECU assembly is 9 V or more.	Turn the ignition switch ON and wait for at least approximately 6 seconds.	EPS warning light illuminates.	-	DTC remains stored only while malfunction is occurring.
U023A	Lost Communication with Front Camera Module	The power steering ECU assembly does not receive data from the forward recognition camera for approximately 2 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the power steering ECU assembly is 9 V or more.	Turn the ignition switch ON and wait for at least approximately 5 seconds.	-	-	DTC remains stored only while malfunction is occurring.
U1110	Lost Communication with Clearance Sonar Module	The power steering ECU assembly does not receive data from the clearance warning ECU assembly for approximately 2 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the power steering ECU assembly is 9 V or more.	Turn the ignition switch ON and wait for at least approximately 5 seconds.	-	-	DTC remains stored only while malfunction is occurring.

Main Body ECU (Multiplex Network Body ECU) / GTS Display "Main Body"

Body Electrical > Main Body > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The main body ECU (multiplex network body ECU) does not receive data from the ECM for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 10 seconds or more. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 20 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0101	Lost Communication with TCM	The main body ECU (multiplex network body ECU) does not receive data from the ECM for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 10 seconds or more. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 20 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0120	Lost Communication with Starter / Generator Control Module	The main body ECU (multiplex network body ECU) does not receive data from the certification ECU (smart key ECU assembly) for approximately 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and approximately 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 20 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The main body ECU (multiplex network body ECU) does not receive data from the brake actuator assembly for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 10 seconds or more. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 20 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0151	Lost Communication with Restraints Control Module	The main body ECU (multiplex network body ECU) does not receive data from the airbag sensor assembly for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 10 seconds or more. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 20 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	The main body ECU (multiplex network body ECU) does not receive data from the combination meter assembly for approximately 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and approximately 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 20 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0182	Lost Communication with AFS	The main body ECU (multiplex network body ECU) does not receive data from the headlight ECU sub-assembly LH for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 10 seconds or more. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 20 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U023A	Lost Communication With Image Processing Module "A"	The main body ECU (multiplex network body ECU) does not receive data from the forward recognition camera for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 10 seconds or more. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 15 seconds.	Automatic high beam indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U0327	Software Incompatibility with Vehicle Security Control Module	The main body ECU (multiplex network body ECU) does not receive data from the certification ECU (smart key ECU assembly) for approximately 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and approximately 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 20 seconds.	-	-	DTC is stored until it is cleared using the GTS.

Certification ECU (Smart Key ECU Assembly) / GTS Display "Entry&Start"

Body Electrical > Entry&Start > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The certification ECU (smart key ECU assembly) does not receive data from the ECM for approximately 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and approximately 10 seconds or more elapse. The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 20 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The certification ECU (smart key ECU assembly) does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and approximately 10 seconds or more elapse. The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 20 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	The certification ECU (smart key ECU assembly) does not receive data from the combination meter assembly for approximately 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and approximately 10 seconds or more elapse. The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 20 seconds.	-	-	DTC is stored until it is cleared using the GTS.

Certification ECU (Smart Key ECU Assembly) / GTS Display "Power Source Control"

Body Electrical > Power Source Control > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM Communication	The certification ECU (smart key ECU assembly) does not receive data from the ECM for approximately 4 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 4 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0140	Lost Communication with Body Control Module	The certification ECU (smart key ECU assembly) does not receive data from the main body ECU (multiplex network body ECU) for approximately 3 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	The certification ECU (smart key ECU assembly) does not receive data from the combination meter assembly for approximately 4 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 4 seconds.	-	-	DTC is stored until it is cleared using the GTS.

Headlight ECU Sub-assembly LH / GTS Display "HL AutoLeveling"

Body Electrical > HL AutoLeveling > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Refer to Lighting System.

Click here
*2: Refer to Lighting System.

Click here

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0073	Control Module Communication Bus Off	The headlight ECU sub-assembly LH does not send/receive data.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the headlight ECU sub-assembly LH is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0100	Lost Communication with ECM/PCM "A"	The headlight ECU sub-assembly LH does not receive data from the ECM for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the headlight ECU sub-assembly LH is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 13 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The headlight ECU sub-assembly LH does not receive data from the brake booster with master cylinder assembly for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the headlight ECU sub-assembly LH is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 13 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The headlight ECU sub-assembly LH does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the headlight ECU sub-assembly LH is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 13 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0242*1	Lost Communication with Headlamp Control Module "B"	The headlight ECU sub-assembly LH does not receive data from the headlight ECU sub-assembly RH for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the headlight ECU sub-assembly LH is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 13 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U1000*2	CAN Communication Failure(Message Registry)	CAN communication malfunction (message register)	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the headlight ECU sub-assembly LH is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	-	-	DTC is stored until it is cleared using the GTS.

Combination Meter Assembly / GTS Display "Combination Meter"

Body Electrical > Combination Meter > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The combination meter assembly does not receive data from the ECM for approximately 2 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	MIL illuminates.	-	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The combination meter assembly does not receive data from the brake actuator assembly for approximately 3 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	Brake warning light illuminates. Slip indicator light illuminates. ABS warning light illuminates.	-	DTC is stored until it is cleared using the GTS.
U0131	Lost Communication with Power Steering Control Module	The combination meter assembly does not receive data from the power steering ECU assembly for approximately 3 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	EPS warning light illuminates.	-	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The combination meter assembly does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 10 seconds.	Tire pressure warning light illuminates.	-	DTC is stored until it is cleared using the GTS.
U0151	Lost Communication with Restraints Control Module	The combination meter assembly does not receive data from the airbag sensor assembly for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 10 seconds.	SRS warning light illuminates.	-	DTC is stored until it is cleared using the GTS.
U0163	Lost Communication with Navigation Control Module	The combination meter assembly does not receive data from the radio and display receiver assembly for approximately 3 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0182	Lost Communication with Lighting Control Module Front	The combination meter assembly does not receive data from the headlight ECU sub-assembly LH for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 10 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0235	Lost Communication with Cruise Control Front Distance Range Sensor	The combination meter assembly does not receive data from the millimeter wave radar sensor assembly for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 10 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U023A	Lost Communication with Front Camera Module	When either of the following conditions is met*1: The combination meter assembly does not receive data from the forward recognition camera for approximately 10 seconds or more. The combination meter assembly does not receive data from the millimeter wave radar sensor assembly for approximately 10 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 10 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

*1: When U0235 and U023A are output simultaneously, there may be a malfunction in the millimeter wave radar sensor assembly.

Air Conditioning Amplifier Assembly / GTS Display "Air Conditioner"

Body Electrical > Air Conditioner > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM	The air conditioning amplifier assembly does not receive data from the ECM for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the air conditioning amplifier assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 5 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0131	Lost Communication With Power Steering Control Module	The air conditioning amplifier assembly does not receive data from the power steering ECU assembly for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the air conditioning amplifier assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 5 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication With Body Control Module "B"	The air conditioning amplifier assembly does not receive data from the main body ECU (multiplex network body ECU) for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the air conditioning amplifier assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 5 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication With Instrument Panel Cluster (IPC) Control Module	The air conditioning amplifier assembly does not receive data from the combination meter assembly for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the air conditioning amplifier assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 5 seconds.	-	-	DTC is stored until it is cleared using the GTS.

ECM (for 8NR-FTS) / GTS Display "Cruise Control"

Powertrain > Cruise Control > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC

Detection Item

DTC Detection Condition

DTC Detection Pre-condition

DTC Check Procedure

Warning Displayed

DTC Storage Method

Indication in Meter

Multi-information Display

U012287

Lost Communication with Vehicle Dynamics Control Module Missing Message

The ECM does not receive data from the brake actuator assembly for approximately 3 seconds or more.

All conditions are met:

The ignition switch is ON for approximately 1 second or more.
The cruise control main switch is on.
The power source voltage of the ECM is 10.5 V or more.

Turn the cruise control main switch on and wait at least approximately 4 seconds.

Displays messages on the multi-information display.

DTC is stored until it is cleared using the GTS.

ECM (for 3ZR-FAE) / GTS Display "Cruise Control"

Powertrain > Cruise Control > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC

Detection Item

DTC Detection Condition

DTC Detection Pre-condition

DTC Check Procedure

Warning Displayed

DTC Storage Method

Indication in Meter

Multi-information Display

U0122

Lost Communication with Vehicle Dynamics Control Module

The ECM does not receive data from the brake actuator assembly for approximately 3 seconds or more.

All conditions are met:

The ignition switch is ON for approximately 1 second or more.
The cruise control main switch is on.
The power source voltage of the ECM is 10.5 V or more.

Turn the cruise control main switch on and wait at least approximately 4 seconds.

Displays messages on the multi-information display.

DTC is stored until it is cleared using the GTS.

ECM (for 8NR-FTS) / GTS Display "Cruise Control"

Powertrain > Cruise Control > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: w/ Differential pressure sensor
*2: w/o Differential pressure sensor

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U010087	Lost Communication with ECM/PCM "A" Missing Message	The ECM does not receive data from the brake actuator assembly for approximately 1 second or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The cruise control main switch is on. The power source voltage of the ECM is 10.5 V or more.	Turn the cruise control main switch on and wait at least approximately 2 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U010487*1	Lost Communication with Cruise Control Module Missing Message	The ECM does not receive data from the millimeter wave radar sensor assembly for approximately 1 second or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The cruise control main switch is on. The power source voltage of the ECM is 10.5 V or more.	Turn the cruise control main switch on and wait at least approximately 2 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U012287	Lost Communication with Vehicle Dynamics Control Module Missing Message	The ECM does not receive data from the brake actuator assembly for approximately 3 seconds or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The cruise control main switch is on. The power source voltage of the ECM is 10.5 V or more.	Turn the cruise control main switch on and wait at least approximately 4 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U110487*2	Lost Communication with Cruise Control Module Missing Message	The ECM does not receive data from the millimeter wave radar sensor assembly for approximately 1 second or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The cruise control main switch is on. The power source voltage of the ECM is 10.5 V or more.	Turn the cruise control main switch on and wait at least approximately 2 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Millimeter Wave Radar Sensor Assembly / GTS Display "Radar Cruise2"

Powertrain > Radar Cruise2 > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The millimeter wave radar sensor assembly does not receive data from the ECM for approximately 1 second or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The cruise control main switch is on. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the cruise control main switch on and drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 2 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0125	Lost Communication with Yaw Rate Sensor Module	The millimeter wave radar sensor assembly does not receive data from the airbag sensor assembly for approximately 1 second or more.	All conditions are met: The ignition switch is ON for approximately 3 seconds or more. The cruise control main switch is on. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the cruise control main switch on and drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 4 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The millimeter wave radar sensor assembly does not receive data from the steering sensor for approximately 1 second or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The cruise control main switch is on. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the cruise control main switch on and drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 2 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The millimeter wave radar sensor assembly does not receive data from the brake actuator assembly for approximately 3 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The cruise control main switch is on. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the cruise control main switch on and drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 5 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Millimeter Wave Radar Sensor Assembly / GTS Display "Pre-Collision 2"

Body Electrical > Pre-Collision 2 > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Refer to Pre-Collision System.

Click here

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The millimeter wave radar sensor assembly does not receive data from the ECM for approximately 1 second or more.	All conditions are met: The ignition switch is ON for approximately 3 seconds or more. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 4 seconds or more.	PCS indicator blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0125	Lost Communication with Yaw Rate Sensor Module	The millimeter wave radar sensor assembly does not receive data from the airbag sensor assembly for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 4 seconds.	PCS indicator blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The millimeter wave radar sensor assembly does not receive data from the steering sensor for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 4 seconds.	PCS indicator blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The millimeter wave radar sensor assembly does not receive data from the brake actuator assembly for approximately 4 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 7 seconds.	PCS indicator blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0235*1	Lost Communication with Cruise Control Front Distance Range Sensor	The millimeter wave radar sensor assembly does not receive data from the brake actuator assembly for approximately 2 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 4 seconds.	PCS indicator blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U023A*1	Lost Communication with Image Processing Module "A"	The millimeter wave radar sensor assembly does not receive data from the forward recognition camera for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 4 seconds.	PCS indicator blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U1002*1	Lost Communication with Gateway Module	The millimeter wave radar sensor assembly does not receive data from the forward recognition camera for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 4 seconds.	PCS indicator blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Forward Recognition Camera / GTS Display "LKA/LDA"

Chassis > LKA/LDA > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Refer to Lane Departure Alert System.

Click here

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The forward recognition camera does not receive data from the ECM for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The LDA main switch is on. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the LDA main switch on and then drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 7 seconds or more.	LDA indicator illuminates (yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0123	Lost Communication with Yaw Rate Sensor Module	The forward recognition camera does not receive data from the airbag sensor assembly for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The LDA main switch is on. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the LDA main switch on and then drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 7 seconds or more.	LDA indicator illuminates (yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The forward recognition camera does not receive data from the steering sensor for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The LDA main switch is on. Vehicle speed is 1 km/h (1 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the LDA main switch on and then drive the vehicle at a speed of 1 km/h (1 mph) or more for approximately 7 seconds or more.	LDA indicator illuminates (yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The forward recognition camera does not receive data from the brake actuator assembly for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 7 seconds.	LDA indicator illuminates (yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0131	Lost Communication with Power Steering Control Module	The forward recognition camera does not receive data from the power steering ECU assembly for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The LDA main switch is on. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the LDA main switch on and then drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 7 seconds or more.	LDA indicator illuminates (yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The forward recognition camera does not receive data from the main body ECU (multiplex network body ECU) for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The LDA main switch is on. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch ON, turn the LDA main switch on and wait for at least approximately 7 seconds.	LDA indicator illuminates (yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter)	The forward recognition camera does not receive data from the combination meter assembly for approximately 50 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The LDA main switch is on. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch ON, turn the LDA main switch on and wait for at least approximately 52 seconds.	LDA indicator illuminates (yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0235*1	Lost Communication with Cruise Control Front Distance Range Sensor	The forward recognition camera does not receive data from the millimeter wave radar sensor assembly for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 7 seconds or more.	LDA indicator illuminates (yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U023A*1	Lost Communication with Image Processing Module "A"	The power steering ECU assembly does not receive data from the forward recognition camera for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The LDA main switch is on. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the LDA main switch on and then drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 7 seconds or more.	LDA indicator illuminates (yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Forward Recognition Camera / GTS Display "Front Recognition Camera"

Chassis > Front Recognition Camera > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Refer to Front Recognition Camera System.

Click here

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The forward recognition camera does not receive data from the ECM for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. Vehicle speed is 1 km/h (1 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Drive the vehicle at a speed of 1 km/h (1 mph) or more for approximately 7 seconds or more.	-	-	DTC is stored until it is cleared using the GTS.
U0101	Lost Communication with TCM	The forward recognition camera does not receive data from the ECM for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. Vehicle speed is 1 km/h (1 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Drive the vehicle at a speed of 1 km/h (1 mph) or more for approximately 7 seconds or more.	-	-	DTC is stored until it is cleared using the GTS.
U0123	Lost Communication with Yaw Rate Sensor Module	The forward recognition camera does not receive data from the airbag sensor assembly for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. Vehicle speed is 1 km/h (1 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Drive the vehicle at a speed of 1 km/h (1 mph) or more for approximately 7 seconds or more.	-	-	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The forward recognition camera does not receive data from the steering sensor for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 7 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The forward recognition camera does not receive data from the brake actuator assembly for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 7 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0131	Lost Communication with Power Steering Control Module	The forward recognition camera does not receive data from the power steering ECU assembly for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 7 seconds..	-	-	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The forward recognition camera does not receive data from the main body ECU (multiplex network body ECU) for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 7 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	The forward recognition camera does not receive data from the combination meter assembly for approximately 5 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 7 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0235*1	Lost Communication with Cruise Control Front Distance Range Sensor	The forward recognition camera does not receive data from the millimeter wave radar sensor assembly for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 7 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U023A*1	Lost Communication with Image Processing Module "A"	The power steering ECU assembly does not receive data from the forward recognition camera for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 7 seconds.	-	-	DTC is stored until it is cleared using the GTS.

Forward recognition camera / GTS Display "Road Sign Assist"

Body Electrical > Road Sign Assist > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Illuminates when the road sign assist system is malfunctioning.
*2: for Monochrome TFT Type

DTC

Detection Item

DTC Detection Condition

DTC Detection Pre-condition

DTC Check Procedure

Warning Displayed

DTC Storage Method

Indication in Meter

Multi-information Display

U0123

Lost Communication with Yaw Rate Sensor Module

The forward recognition camera does not receive data from the airbag sensor assembly for approximately 5 seconds or more.

All conditions are met:

The ignition switch is ON for approximately 2 seconds or more.
Vehicle speed is 1 km/h (1 mph) or more.
The power source voltage of the forward recognition camera is 10 V or more.

Drive the vehicle at a speed of 1 km/h (1 mph) or more for approximately 7 seconds or more.

Master warning light illuminates.*1, *2

Displays messages on the multi-information display.

DTC is stored until it is cleared using the GTS.

U0129

Lost Communication with Brake System Control Module

The forward recognition camera does not receive data from the brake actuator assembly for approximately 5 seconds or more.

Both conditions are met:

The ignition switch is ON for approximately 2 seconds or more.
The power source voltage of the forward recognition camera is 10 V or more.

Turn the Ignition switch ON, and wait at least approximately 7 seconds or more.

Master warning light illuminates.*1, *2

Displays messages on the multi-information display.

DTC is stored until it is cleared using the GTS.

Clearance Warning ECU Assembly / GTS Display "IPA/ICS/Clearance Sonar"

Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Refer to Toyota Parking Assist-sensor System and Simple Intelligent Parking Assist System.

for Toyota Parking Assist-sensor System with Simple Intelligent Parking Assist System:

Click here

for Toyota Parking Assist-sensor System without Simple Intelligent Parking Assist System:

Click here

for Simple Intelligent Parking Assist System:

Click here

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0073	Control Module Communication Bus "A" Off	Either of the following conditions is met: The clearance warning ECU assembly does not receive data from an ECU or sensor to which it sent data for approximately 2 seconds or more. The clearance warning ECU assembly does not send/receive data consecutively 10 times or more within 5 seconds.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the clearance warning ECU assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 8 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0100	Lost Communication with ECM/PCM "A"	The clearance warning ECU assembly does not receive data from the ECM for approximately 6 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the clearance warning ECU assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 9 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication With Steering Angle Sensor Module	The clearance warning ECU assembly does not receive data from the steering sensor for approximately 6 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the clearance warning ECU assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 9 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The clearance warning ECU assembly does not receive data from the brake actuator assembly for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the clearance warning ECU assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 8 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0131	Lost Communication with Power Steering Control Module	The clearance warning ECU assembly does not receive data from the power steering ECU assembly for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the clearance warning ECU assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 4 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0140	Lost Communication with Body Control Module	The clearance warning ECU assembly does not receive data from the main body ECU (multiplex network body ECU) for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the clearance warning ECU assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 8 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0151	Lost Communication with Restraints Control Module (Air Bag)	The clearance warning ECU assembly does not receive data from the airbag sensor assembly for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the clearance warning ECU assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 4 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication With Instrument Panel Cluster (IPC) Control Module	The clearance warning ECU assembly does not receive data from the combination meter assembly for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the clearance warning ECU assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 8 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0164	Lost Communication with HVAC Control Module	The clearance warning ECU assembly does not receive data from the air conditioning amplifier assembly for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the clearance warning ECU assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 8 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U1000*1	CAN Communication Failure(Message Registry)	CAN communication malfunction (message register)	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the clearance warning ECU assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U1103	Lost Communication with Stop and Start Control Module	The clearance warning ECU assembly does not receive data from the engine stop and start ECU for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the clearance warning ECU assembly is 9.5 V or more.	Turn the ignition switch ON and wait for at least approximately 4 seconds.	-	-	DTC is stored until it is cleared using the GTS.

Blind Spot Monitor Sensor LH / GTS Display "Blind Spot Monitor Master"

Body Electrical > Blind Spot Monitor Master > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Refer to Blind Spot Monitor System.

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*2: Refer to Blind Spot Monitor System.

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DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The blind spot monitor sensor LH does not receive data from the ECM for approximately 11 seconds or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The blind spot monitor main switch is on. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait for approximately 12 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0125	Lost Communication with Yaw Rate Sensor Module	The blind spot monitor sensor LH does not receive data from the airbag sensor assembly for approximately 4 seconds or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The blind spot monitor main switch is on. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait for approximately 5 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The blind spot monitor sensor LH does not receive data from the steering sensor for approximately 11 seconds or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The blind spot monitor main switch is on. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait for approximately 12 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The blind spot monitor sensor LH does not receive data from the brake booster with master cylinder assembly for approximately 3 seconds or more.	All conditions are met: The ignition switch is ON for approximately 2 seconds or more. The blind spot monitor main switch is on. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait for approximately 5 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The blind spot monitor sensor LH does not receive data from the main body ECU (multiplex network body ECU) for approximately 11 seconds or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The blind spot monitor main switch is on. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait for approximately 12 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0232*1	Lost Communication with Blind Spot Monitor Slave Module	The blind spot monitor sensor LH does not receive data from the blind spot monitor sensor RH for approximately 11 seconds or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The blind spot monitor main switch is on. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait for approximately 12 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U1331*2	Software Incompatibility with Body Control Module "B"	Destination information of the main body ECU (multiplex network body ECU) and blind spot monitor sensor LH do not match.	All conditions are met: The ignition switch is ON for approximately 1 second or more. The blind spot monitor main switch is on. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait for approximately 1 second or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Radio and Display Receiver Assembly / GTS Display "Navigation System"

Body Electrical > Navigation System > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0073	Sending Malfunction (Navigation to APGS)	The radio and display receiver assembly does not send/receive data for approximately 5 seconds or more.	The ignition switch is ON.	Turn the ignition switch ON and wait for at least approximately 5 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0100	Engine ECU Communication	The radio and display receiver assembly does not receive data from the ECM for approximately 10 seconds or more.	The ignition switch is ON.	Turn the ignition switch ON and wait for at least approximately 10 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0129	VSC(ECB)ECU Communication	The radio and display receiver assembly does not receive data from the brake actuator assembly for approximately 1 second or more.	The ignition switch is ON.	Turn the ignition switch ON and wait for at least approximately 1 second.	-	-	DTC is stored until it is cleared using the GTS.
U0140	Lost Communication with Body Control Module	The radio and display receiver assembly does not receive data from the main body ECU (multiplex network body ECU) for approximately 3 seconds or more.	The ignition switch is ON.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0155	Meter ECU Communication	The radio and display receiver assembly does not receive data from the combination meter assembly for approximately 30 seconds or more.	The ignition switch is ON.	Turn the ignition switch ON and wait for at least approximately 30 seconds.	-	-	DTC is stored until it is cleared using the GTS.
U0164	Air Conditioner ECU Communication	The radio and display receiver assembly does not receive data from the air conditioning amplifier assembly for approximately 15 seconds or more.	The ignition switch is ON.	Turn the ignition switch ON and wait for at least approximately 15 seconds.	-	-	DTC is stored until it is cleared using the GTS.

Engine Stop and Start ECU / GTS Display "Stop and Start"

Powertrain > Stop and Start > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The engine stop and start ECU does not receive data from the ECM for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the engine stop and start ECU is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 2 seconds.	Stop and start cancel indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U0121	Lost Communication with Anti-Lock Brake System (ABS) Control Module	The engine stop and start ECU does not receive data from the skid control ECU (brake actuator assembly) for approximately 3 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 3 seconds or more. The power source voltage of the engine stop and start ECU is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 6 seconds.	Stop and start cancel indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The engine stop and start ECU does not receive data from the steering sensor for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the engine stop and start ECU is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 2 seconds.	Stop and start cancel indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U0131	Lost Communication with Power Steering Control Module	The engine stop and start ECU does not receive data from the power steering ECU assembly for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the engine stop and start ECU is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 2 seconds.	Stop and start cancel indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U0140	Lost Communication with J/B ECU	The engine stop and start ECU does not receive data from the main body ECU (multiplex network body ECU) assembly for approximately 4 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the engine stop and start ECU is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 5 seconds.	Stop and start cancel indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U0151	Lost Communication with SRS Airbag ECU	The engine stop and start ECU does not receive data from the airbag sensor assembly for approximately 11 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the engine stop and start ECU is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 12 seconds.	Stop and start cancel indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U0164	Lost Communication with HVAC Control Module	The engine stop and start ECU does not receive data from the air conditioning amplifier assembly for approximately 11 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the engine stop and start ECU is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 12 seconds.	Stop and start cancel indicator light blinks.	-	DTC is stored until it is cleared using the GTS.
U1110	Lost Communication with Clearance Sonar Module	The engine stop and start ECU does not receive data from the clearance warning ECU assembly for approximately 1 second or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the engine stop and start ECU is 10.5 V or more.	Turn the ignition switch ON and wait for at least approximately 2 seconds.	Stop and start cancel indicator light blinks.	-	DTC is stored until it is cleared using the GTS.

Telematics Transceiver / GTS Display "Telematics"

Body Electrical > Telematics > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Engine ECU Communication	The telematics transceiver does not receive data from the ECM for approximately 2 seconds or more.	The ignition switch ON for approximately 10 seconds or more.	Turn the ignition switch ON and wait at least approximately 12 seconds.	-	-	The DTC remains stored until it is cleared using the GTS.

4WD ECU Assembly / GTS Display "Four Wheel Drive"

Chassis > Four Wheel Drive > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0073	Control Module Communication Bus Off	The 4WD ECU assembly does not send/receive data for approximately 5 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the 4WD ECU assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 6 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0100	Lost Communication with ECM/PCM "A"	The 4WD ECU assembly does not receive data from the ECM for approximately 4 seconds or more.	All conditions are met: The ignition switch is ON for approximately 1 second or more. Vehicle speed is 60 km/h (37 mph) or more. The power source voltage of the 4WD ECU assembly is 10 V or more.	Drive the vehicle at a speed of 60 km/h (37 mph) or more for approximately 5 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	Either of the following conditions is met: The 4WD ECU assembly does not receive data from the steering sensor for approximately 1 second or more. The following condition occurs 10 times or more within approximately 60 seconds: The 4WD ECU assembly does not receive data from the steering sensor once or more within 5 seconds.	Both conditions are met: The ignition switch is ON for approximately 1 second or more. The power source voltage of the 4WD ECU assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 61 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The 4WD ECU assembly does not receive data from the brake actuator assembly for approximately 8 seconds or more.	Both conditions are met: The ignition switch is ON for approximately 2 seconds or more. The power source voltage of the 4WD ECU assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 10 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Central Gateway ECU (Network Gateway ECU) / GTS Display "Central Gateway"

Tech Tips

The central gateway ECU (network gateway ECU) is connected to the CAN communication system, but the central gateway ECU (network gateway ECU) does not store or output CAN communication DTCs.
Steering Sensor / GTS Display "-"

Tech Tips

The steering sensor is connected to the CAN communication system, but the steering sensor does not store or output CAN communication DTCs.
Airbag Sensor Assembly / GTS Display "SRS Airbag"

Tech Tips

The airbag sensor assembly is connected to the CAN communication system, but the airbag sensor assembly does not store or output CAN communication DTCs.

CAN BUS WAVEFORMS

Tech Tips

This waveform is measured between terminals CANH and GND, and terminals CANL and GND of the central gateway ECU (network gateway ECU). (Use this as a reference for diagnosis of CAN communication lines.)
When malfunctions in multiple ECUs are suspected based on the CAN bus check and DTCs checked using the GTS, check the resistance of the CAN bus using an ohmmeter first. If no problems are found, check the following waveforms.

Click here
If a waveform is not similar to one of the following 3 patterns (Group 1), then an open in a CAN main bus line, an open in a CAN branch line, or a short between a CAN line (CANH or CANL) and ground is suspected (Group 2).
Wiggle the connector and wire harness to check if the waveform changes.

CAN bus waveforms (Group 1)


*a	1 V/DIV.
*b	50 μs/DIV.

Normal waveform


*a	1 V/DIV.
*b	50 μs/DIV.

Open in both of the lines (CANH and CANL) of a CAN branch

Tech Tips

Waveforms (waveforms shown using dotted lines) are not present from an ECU or sensor connected to a CAN branch with an open circuit in both lines. (Waveforms from other ECUs or sensors are normal.)
Because this waveform is similar to a normal waveform, instead of using the waveform, the malfunctioning part can be narrowed down by performing a CAN bus check.


*a	1 V/DIV.
*b	50 μs/DIV.

Short between the CAN bus lines (CANH and CANL)

Tech Tips

Waveforms disappear.
If the malfunction is in an ECU, disconnecting the ECU will change the waveform. If the waveform does not change, a malfunction in the wire harness is suspected.

CAN bus waveforms (reference) (Group 2)

Note

The following CAN bus waveforms can be used only as reference. The actual measured waveform may differ significantly depending on the location of the open or short circuit.


*a	1 V/DIV.
*b	50 μs/DIV.

Open in a CAN branch line (CANH)

Tech Tips

An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.
Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.


*a	1 V/DIV.
*b	50 μs/DIV.

Open in a CAN branch line (CANL)

Tech Tips

An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.
Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.


*a	1 V/DIV.
*b	50 μs/DIV.

Open in a CAN main bus line (CANH)

Tech Tips

Waveforms of ECUs or sensors that are closer to the central gateway ECU (network gateway ECU) than the open part are almost normal.
Waveforms of ECUs or sensors that are on the opposite side of the central gateway ECU (network gateway ECU) from the open part are abnormal.
An open in a CAN main bus line can be confirmed by measuring the resistance between the CANH and CANL terminals of any CAN branch.


*a	1 V/DIV.
*b	50 μs/DIV.

Short between a CAN bus line (CANH) and ground

Tech Tips

Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.
A short to ground in the CANH line can be confirmed by measuring the resistance between CANH and ground using an ohmmeter.


*a	1 V/DIV.
*b	50 μs/DIV.

Short between a CAN bus line (CANL) and ground

Tech Tips

Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.
A short to ground in the CANL line can be confirmed by measuring the resistance between CANL and ground using an ohmmeter.

DATA SENDING/RECEIVING TABLE

Data sending/receiving table

Tech Tips

If Data List items related to sent/received data are not displayed properly, the part for which communication is interrupted can be determined using the table below.

Data Content	Data Detected and Sent by	Data Received by		Relevant Data List Item
Data Content	Data Detected and Sent by	Can be Checked in the Data List	Cannot be Checked in the Data List	Selected System	Data List Items	Link
Accelerator position	ECM	Brake actuator assembly Engine stop and start ECU	Forward recognition camera Clearance warning ECU assembly 4WD ECU assembly Radio and display receiver assembly Millimeter wave radar sensor assembly	Engine	Accelerator Position (for 8NR-FTS)	Click here
				Engine	Accelerator Position (for 3ZR-FAE)	Click here
				ABS/VSC/TRC/EPB	Accelerator Opening Angle %	Click here
				Stop and Start	Accelerator Position	Click here
Engine speed	ECM	Brake actuator assembly Engine stop and start ECU Power steering ECU assembly	Clearance warning ECU assembly Airbag sensor assembly Combination meter assembly Certification ECU (smart key ECU assembly) Main body ECU (multiplex network body ECU) Air conditioning amplifier assembly 4WD ECU assembly Telematics transceiver Radio and display receiver assembly	Engine	Engine Speed (for 8NR-FTS)	Click here
				Engine	Engine Speed (for 3ZR-FAE)	Click here
				ABS/VSC/TRC/EPB	Engine Revolution	Click here
				Stop and Start	Engine Spd (ECM)	Click here
				EMPS	Engine Revolution	Click here
Engine coolant temperature	ECM	Combination meter assembly Air conditioning amplifier assembly Engine stop and start ECU	-	Engine	Coolant Temperature (for 8NR-FTS)	Click here
				Engine	Coolant Temperature (for 3ZR-FAE)	Click here
				Combination Meter	Coolant Temperature	Click here
				Air Conditioner	Engine Coolant Temp (for Automatic Air Conditioning System with Top-mounted Air Conditioner Pressure Sensor)	Click here
					Engine Coolant Temp (for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor)	Click here
					Engine Coolant Temp (for Manual Air Conditioning System)	Click here
				Stop and Start	Coolant Temp	Click here
Vehicle speed	Brake actuator assembly	Power steering ECU assembly ECM Combination meter assembly Radio and display receiver assembly Millimeter wave radar sensor assembly Engine stop and start ECU	Forward recognition camera Clearance warning ECU assembly Airbag sensor assembly Certification ECU (smart key ECU assembly) Main body ECU (multiplex network body ECU) Telematics transceiver	ABS/VSC/TRC/EPB	Vehicle Speed	Click here
				EMPS	Meter Vehicle Velocity	Click here
				Engine	Vehicle Speed (for 8NR-FTS)	Click here
				Engine	Vehicle Speed (for 3ZR-FAE)	Click here
				Combination Meter	Vehicle Speed Meter	Click here
				Navigation System	Vehicle Speed	Click here
				Radar Cruise2	Vhcl Spd-Brake ECU	Click here
				Stop and Start	Vehicle Spd1 (ABS/VSC)	Click here
Vehicle speed	Combination meter assembly*3	-	Clearance warning ECU assembly Certification ECU (smart key ECU assembly) Main body ECU (multiplex network body ECU) Air conditioning amplifier assembly Telematics transceiver	Combination Meter	Vehicle Speed Meter	Click here
Wheel speed	Brake actuator assembly	Headlight ECU sub-assembly LH Power steering ECU assembly 4WD ECU assembly	Forward recognition camera Clearance warning ECU assembly Blind spot monitor sensor LH Airbag sensor assembly Millimeter wave radar sensor assembly	ABS/VSC/TRC/EPB	FR Wheel Speed FL Wheel Speed RR Wheel Speed RL Wheel Speed	Click here
				HL AutoLeveling	Front Right Wheel Speed Value Front Left Wheel Speed Value	Click here
				EMPS	Wheel Speed Right Wheel Speed Left	Click here
				Four Wheel Drive	FR Wheel Speed FL Wheel Speed RR Wheel Speed RL Wheel Speed	Click here
Shift position	ECM	Clearance warning ECU assembly Blind spot monitor sensor LH Certification ECU (smart key ECU assembly) Radio and display receiver assembly Engine stop and start ECU	Forward recognition camera Airbag sensor assembly Combination meter assembly*2 Main body ECU (multiplex network body ECU) Headlight ECU sub-assembly LH Air conditioning amplifier assembly Millimeter wave radar sensor assembly	Engine	Neutral Position SW (for 8NR-FTS)	Click here
				Engine	Neutral Position SW (for 3ZR-FAE)	Click here
				IPA/ICS/Clearance Sonar	Parking Signal Reverse Signal	Click here
				Blind Spot Monitor Master	Reverse (Only for AT/CVT)	Click here
				Power Source Control	Shift P Signal	Click here
				Navigation System	Reverse Signal	Click here
				Stop and Start	Shift Position	Click here
Ambient temperature	Air conditioning amplifier assembly	Engine stop and start ECU Combination meter assembly	ECM Brake actuator assembly Forward recognition camera Clearance warning ECU assembly Radio and display receiver assembly Millimeter wave radar sensor assembly	Air Conditioner	Ambient Temp Sensor (for Automatic Air Conditioning System with Top-mounted Air Conditioner Pressure Sensor)	Click here
					Ambient Temp Sensor (for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor)	Click here
					Ambient Temp Sensor (for Manual Air Conditioning System)	Click here
				Stop and Start	Ambient Temperature	Click here
				Combination Meter	Ambient Temperature	Click here
Driver door courtesy switch	Main body ECU (multiplex network body ECU)	Engine stop and start ECU	Forward recognition camera Clearance warning ECU assembly Combination meter assembly*2 Certification ECU (smart key ECU assembly) Air conditioning amplifier assembly Radio and display receiver assembly Telematics transceiver	Main Body	FL Door Courtesy SW (for LHD) FR Door Courtesy SW (for RHD)	Click here
Driver door courtesy switch	Main body ECU (multiplex network body ECU)	Engine stop and start ECU		Stop and Start	D Courtesy Switch Signal	Click here
Steering angle	Steering sensor	Blind spot monitor sensor LH Power steering ECU assembly Brake actuator assembly Millimeter wave radar sensor assembly Engine stop and start ECU 4WD ECU assembly	ECM Forward recognition camera Clearance warning ECU assembly Airbag sensor assembly Radio and display receiver assembly	Blind Spot Monitor Master	Steering Angle	Click here
				EMPS	Steering Angle Velocity	Click here
				ABS/VSC/TRC/EPB	Steering Angle Sensor	Click here
				Radar Cruise2	Steering Angle	Click here
				Stop and Start	Steering Angle	Click here
				Four Wheel Drive	Steering Angle Value	Click here
Yaw rate	Airbag sensor assembly	Brake actuator assembly Millimeter wave radar sensor assembly 4WD ECU assembly	Forward recognition camera Clearance warning ECU assembly Power steering ECU assembly	ABS/VSC/TRC/EPB	Yaw Rate Sensor Yaw Rate Sensor2	Click here
				Radar Cruise2	Yaw Rate Sensor	Click here
				Lateral G Four Wheel Drive	Yaw Rate Value	Click here
Acceleration	Airbag sensor assembly	Brake actuator assembly 4WD ECU assembly	Forward recognition camera Clearance warning ECU assembly Power steering ECU assembly ECM Engine stop and start ECU Millimeter wave radar sensor assembly	ABS/VSC/TRC/EPB	Deceleration Sensor Deceleration Sensor2	Click here
Acceleration	Airbag sensor assembly	Brake actuator assembly 4WD ECU assembly		Four Wheel Drive	Forward and Rearward G	Click here
Ignition switch condition	Main body ECU (multiplex network body ECU)	Headlight ECU sub-assembly LH	Certification ECU (smart key ECU assembly)	Main Body	IG SW	Click here
Ignition switch condition	Main body ECU (multiplex network body ECU)	Headlight ECU sub-assembly LH	Certification ECU (smart key ECU assembly)	HL AutoLeveling	+B	Click here
Stop light switch signal	Brake actuator assembly	Certification ECU (smart key ECU assembly) Engine stop and start ECU 4WD ECU assembly	Airbag sensor assembly Combination meter assembly Radio and display receiver assembly Telematics transceiver	ABS/VSC/TRC/EPB	Stop Light SW	Click here
				Power Source Control	Stop Light Switch1	Click here
				Stop and Start	Stop Light SW (ABS/VSC)	Click here
				Four Wheel Drive	Stop Light SW	Click here
Headlight switch signal (high beam)	Main body ECU (multiplex network body ECU)	Headlight ECU sub-assembly LH	Forward recognition camera Combination meter assembly*2 Millimeter wave radar sensor assembly	Main Body	Head Light SW (Head)	Click here
Headlight switch signal (high beam)	Main body ECU (multiplex network body ECU)	Headlight ECU sub-assembly LH		HL AutoLeveling	HeadLight High Beam State	Click here
Side turn signal	Combination meter assembly*2	Blind spot monitor sensor LH Forward recognition camera	Clearance warning ECU assembly Headlight ECU sub-assembly LH Millimeter wave radar sensor assembly	Combination Meter	Turn Signal Switch (Right) Turn Signal Switch (Left)	Click here
				Blind Spot Monitor Master	Turn Switch State	Click here
				LKA/LDA	Turn Signal Switch (Right) Turn Signal Switch (Left)	Click here
Taillight signal	Main body ECU (multiplex network body ECU)	Headlight ECU sub-assembly LH	Clearance warning ECU assembly Blind spot monitor sensor LH Combination meter assembly Millimeter wave radar sensor assembly	Main Body	Head Light SW (Tail)	Click here
Taillight signal	Main body ECU (multiplex network body ECU)	Headlight ECU sub-assembly LH		HL AutoLeveling	Clearance Light State	Click here
ECM power source voltage*1	ECM	-	-	Engine	BATT Voltage (for 8NR-FTS)	Click here
ECM power source voltage*1	ECM	-	-	Engine	BATT Voltage (for 3ZR-FAE)	Click here
Combination meter assembly power source voltage*1	Combination meter assembly	-	-	Combination Meter	+B Voltage Value	Click here
Power steering ECU assembly power source voltage*1	Power steering ECU assembly	-	-	EMPS	IG Power Supply	Click here
Headlight ECU sub-assembly LH power source voltage*1	Headlight ECU sub-assembly LH	-	-	HL AutoLeveling	+B Voltage Value	Click here
Driver door touch sensor*1	Certification ECU (smart key ECU assembly)	-	-	Entry&Start	D-Door Touch Sensor	Click here
Clearance sonar main switch condition*1	Clearance warning ECU assembly	-	-	IPA/ICS/Clearance Sonar	IPA Switch	Click here
Blind spot monitor main switch condition*1	Blind spot monitor sensor LH	-	-	Blind Spot Monitor Master	Main Switch	Click here
Solar sensor*1	Air conditioning amplifier assembly	-	-	Air Conditioner	Solar Sensor (D Side) (for Automatic Air Conditioning System with Top-mounted Air Conditioner Pressure Sensor)	Click here
Solar sensor*1	Air conditioning amplifier assembly	-	-	Air Conditioner	Solar Sensor (D Side) (for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor)	Click here
Radio and display receiver assembly power source voltage*1	Radio and display receiver assembly	-	-	Navigation System	Battery Voltage	Click here

*1: Whether the ECU that sends data is functioning or not can be judged by using the GTS to check items such as switches or sensors that send signals to the ECU via direct lines.
*2: Although the received contents cannot be checked in the Data List, whether or not the data is received normally can be checked by observing the combination meter assembly.
*3: The combination meter assembly receives a vehicle speed signal from the brake actuator assembly and sends the signal to other ECUs.