ECUS OR SENSORS WHICH COMMUNICATE THROUGH CAN COMMUNICATION SYSTEM
V Bus
ECM
Brake actuator assembly (skid control ECU)
Spiral with sensor cable sub-assembly (steering angle sensor)*1
Air conditioning amplifier assembly*2, *3
Airbag sensor assembly*9
Certification ECU (smart key ECU assembly)*4
4 wheel drive control ECU*5
Radio and display receiver assembly*6
Navigation receiver assembly*7
Headlight leveling ECU assembly*8
Engine stop and start ECU*10
Telematics transceiver*11
Combination meter assembly
*1: w/ VSC
*2: for Automatic Air Conditioning System
*3: for Manual Air Conditioning System
*4: w/ Entry and Start System
*5: for 4WD
*6: w/ Audio and Visual System (for Radio and Display Type)
*7: w/ Navigation System
*8: for LED Headlight or w/ Headlight Cleaner System
*9: w/ Airbag System
*10: w/ Stop and Start System
*11: w/ Telematics Transceiver
CAN BUS CHECK
Tech Tips
The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the GTS.
Using the GTS, select CAN Bus Check screen.
Note
It may be possible to select buses that do not have ECUs or sensors from the bus selection pull-down menu. This is not a malfunction. (This occurs when optional devices are not on a sub bus that is monitored by a gateway function equipped ECU.)
In the bus selection pull down menu, all buses applicable to the model are displayed (e.g. LIN communication buses are also displayed). Therefore, refer to the wiring diagrams to check the names of sub buses for CAN communication.
Tech Tips
Different connection statuses are indicated by the background color of ECUs and sensors that are displayed.
Bus Type | Background Color | Connection Status |
---|---|---|
V Bus | 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 was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication). | |
Not displayed | Communication stop has continued since the start of the CAN bus check.*1 | |
Sub bus (gateway function equipped ECU that does not have history of connected ECUs)*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 was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication). | |
Not displayed | Communication stop has continued since the start of the CAN bus check.*1 | |
Sub bus (gateway function equipped ECU that has history of connected ECUs)*3 |
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 | Currently not communicating (either of the following):
|
|
Not displayed | Either of the following:
|
Tech Tips
Gateway function equipped ECUs relay signals between the ECUs connected to the different buses.
*1: ECUs that are present in the vehicle but are not displayed on the CAN Bus Check.
*2: Gateway function equipped ECU that does not memorize the sub bus ECUs that are connected to it.
*3: Gateway function equipped ECU that memorizes the sub bus ECUs that are connected to it.
If none of the connected ECUs are displayed, or there is no response from the vehicle to the GTS, check the DLC3 branch and the V bus main wires for a malfunction.
Observe the connection response screen for approximately 2 minutes to check for a change in connection status of the connected ECUs and sensors.
Tech Tips
If an open occurs in one of the lines of a CAN branch (except DLC3), output from the other branch line (the line that is not open) will be unstable and it may interfere with the response (display) of other ECUs and sensors.
If the connection status changes during the inspection, repair the open in the branch line of the ECU or sensor that does not respond (is not detected) and then perform the CAN bus check again.
HOW TO INTERPRET CAN BUS CHECK SCREEN
When a communication stop is currently occurring, the probable malfunctioning part can be determined from the CAN bus check and by using the following methods.
Note
The following CAN bus wiring diagram is provided only as an example. This wiring diagram is different from the actual wiring diagram for this vehicle.
Tech Tips
When a communication stop is currently occurring, it is easier to determine the probable malfunctioning part from the CAN bus check rather than from communication DTCs.
Wait for approximately 2 minutes after turning the ignition switch to ON (or simulate the driving conditions that enable the malfunction to be reproduced) and select the CAN bus check. Then observe the communication status of each ECU on the screen.
If a communication error of only 1 ECU or sensor is indicated on the CAN Bus Check screen, a communication stop of the ECU or sensor is suspected.
Example: Open in both CAN branch wires of ECU B on the V bus
*a | V Bus | *b | Sub bus |
*c | Terminating Resistor | *d | Location of malfunction |
*e | Not displayed or background color changes to red or yellow | *f | CAN Bus Check screen |
Tech Tips
When there are communication stops, ECUs are present in the vehicle even though they are not displayed on the CAN Bus Check screen.
*a | Background color periodically changes to yellow or red |
*b | Not displayed or background color is yellow or red |
*c | Not displayed |
If communication errors for multiple ECUs or sensors are indicated on the CAN Bus Check screen, then a communication stop of the ECU or sensor that shows a more serious communication stop (an ECU or a sensor which is not displayed) is suspected.
Example: Open in a CAN branch wire for ECU D on the V bus
Bus Type | Background Color | Connection Status |
---|---|---|
V Bus | 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 was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication). | |
Not displayed | Communication stop has continued since the start of the CAN bus check.*1 | |
Sub bus (gateway function equipped ECU that does not have history of connected ECUs)*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 was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication). | |
Not displayed | Communication stop has continued since the start of the CAN bus check.*1 | |
Sub bus (gateway function equipped ECU that has history of connected ECUs)*3 |
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 | Currently not communicating (either of the following):
|
|
Not displayed | Either of the following:
|
Tech Tips
Gateway function equipped ECUs relay signals between the ECUs connected to the different buses.
*1: ECUs that are present in the vehicle but are not displayed on the CAN Bus Check screen.
*2: Gateway function equipped ECU that does not memorize the sub bus ECUs that are connected to it.
*3: Gateway function equipped ECU that memorizes the sub bus ECUs that are connected to it.
The example of the CAN Bus Check screen in the illustration shows the result of electrical noise on the CAN bus which is caused by an open in a CAN branch wire of ECU D (output from the other branch line is unstable) and the communication of ECU C is also unstable. In addition, in this example, ECU C is equipped with a gateway function. Therefore, communication is also unstable between the sub bus ECUs of ECU C and the V bus.
The example in the illustration shows that ECU D is not displayed on the CAN Bus Check screen. This indicates a more significant communication stop. In this case, a communication stop of ECU D is suspected.
*a | Not displayed or background color changes to red |
If a communication error is indicated on both the V bus and sub bus on the CAN Bus Check screen, suspect any communication stop displayed for the V bus first.
Example: Open in both CAN branch wires of ECU C on the V bus
Tech Tips
In the CAN bus check, it is possible to confirm the communication status of ECUs connected to the V bus after connecting the GTS to the DLC3. As for sub buses, it is possible to confirm which sub bus connected ECUs can communicate with a gateway function equipped ECU on the V bus.
If a gateway function equipped ECU has a communication error, ECUs connected to the gateway function equipped ECU are also affected, and communication stops will be indicated.
The CAN Bus Check screen in the illustration shows that ECU C has a gateway function and a communication stop in ECU C is suspected.
*a | Background color changes to yellow or red |
If the CAN Bus Check screen indicates a communication stop only in the sub bus, a communication stop in the sub bus is suspected.
Example: Open in both CAN branch wires of ECU G on the sub bus
Tech Tips
A communication error in a sub bus does not affect the V bus or other buses.
When a gateway function equipped ECU has memorized the ECUs that are connected to the sub bus, if any of the ECUs connected to the gateway function equipped ECU has a communication error, the background color changes to yellow or red. (The displayed name will not disappear.)
If both of the V bus main wires are open, ECUs or sensors that are located farther away from the DLC3 than the open part will be displayed as a communication stop on the CAN Bus Check screen.
(In this case, ECU A and B are not displayed or their background color changes to red.)
*a | V Bus | *b | Sub Bus |
*c | Terminating Resistor | *d | Location of malfunction |
*e | Not displayed or background color is red | *f | CAN Bus Check screen |
Tech Tips
If a communication error occurs in an ECU, it is not displayed on the CAN Bus Check screen even though the ECU is present.
If both of the sub bus main wires are open, ECUs that are located farther away from the gateway function equipped ECU than the open part will be displayed as a communication stop on the CAN Bus Check screen.
(In this case, ECU I and J are not displayed or their background color changes to red.)
*a | V Bus | *b | Sub Bus |
*c | Terminating Resistor | *d | Location of malfunction |
*e | Not displayed or background color is red | *f | CAN Bus Check screen |
*g | Gateway function equipped ECU | - | - |
*a | When any of the following malfunctions occur on the V bus |
*b | When any of the following malfunctions occur on a sub bus |
*c | Not displayed |
When any of the following malfunctions occur, CAN communication cannot be established and almost all ECUs and sensors on the bus show a communication error on the CAN Bus Check screen.
Short between CAN wires (CANH and CANL) |
Short between a CAN wire (CANH or CANL) and +B |
Short between a CAN wire (CANH or CANL) and ground |
Open in a CAN main wire |
Tech Tips
When a malfunction occurs on the V bus, almost all ECUs and sensors on the V bus and sub bus indicate a communication error (almost all ECUs are not displayed). As communication with the gateway function equipped ECU that is connected to the V bus stops, communication from the ECUs connected to the sub bus that is monitored by the gateway function equipped ECU also stops (these ECUs are not displayed).
When a malfunction occurs in a sub bus, almost all ECUs connected to the sub bus indicate a communication error.
A communication error in a sub bus does not affect the V bus or other buses.
The malfunctioning part can be determined by checking for a short circuit between CAN bus lines or between a CAN bus line and ground or +B short using an electrical tester.
HOW TO INTERPRET COMMUNICATION DTCS (DTCS THAT START WITH U)
If a CAN communication error cannot be reproduced, determine the suspected malfunctioning part using the DTCs stored in ECUs that are connected to the CAN buses by following the procedure below.
Tech Tips
Communication DTCs (DTCs that start with U) indicate a communication error between the ECU that stores the DTC and the ECU that is indicated by the DTC.
If multiple ECUs store a communication DTC for a particular ECU, a communication stop of the ECU is suspected.
*a | Items to be checked | - | - |
Note
This DTC table is from another model, and is only used here to show an example of DTCs that are output when there is an open in a CAN branch wire for the main body ECU. This table does not show DTCs applicable to this vehicle.
Even though a DTC title may indicate a communication error with a specific ECU, the ECU name used in the DTC name on the GTS may differ depending on the ECU that stores the DTC. (Regarding output DTCs, refer to step 6 and the DTC chart for each ECU.)
Tech Tips
As multiple ECUs indicate a communication stop with the main body ECU, the possibility of a communication stop of the main body ECU is high.
If almost all of the communication DTCs of an ECU are stored, a communication stop of the ECU is suspected.
*a | Items to be checked | - | - |
Note
This DTC table is from another model, and is only used here to show an example of DTCs that are output when there is an open in a CAN branch wire for the main body ECU. This table does not show DTCs applicable to this vehicle.
Tech Tips
If almost all of the DTCs of the main body ECU are stored, the possibility of a communication stop of the main body ECU is high.
When a CAN communication error occurs, many DTCs are output. DTCs other than communication error DTCs (such as DTCs that start with C or B) and communication DTCs for the ABS system are important DTCs, however it may be easier to determine the malfunctioning part by examining the overall situation without considering these DTCs.
To help determine the part of the sub bus that has a communication error, prioritize the communication stop DTCs stored in the gateway function equipped ECU.
*a | Items to be checked | *b | ECM |
*c | Gateway function equipped ECU | *d | Location of malfunction |
*e | V Bus | *f | Sub Bus |
Note
This DTC table is from another model, and is only used here to show the ECUs connected to both a V bus and a sub bus. It shows DTCs output when there is an open in the main wires for the ECM on the sub bus. This table does not show DTCs applicable to this vehicle.
Tech Tips
As gateway function equipped ECUs (sub bus monitor ECU) monitor signals from all ECUs that are connected to sub buses, gateway function equipped ECUs can detect ECUs with a communication stop more accurately.
When there is a communication stop for the gateway function equipped ECU (gateway), communication with ECUs connected to other buses such as the V bus stops. Therefore, communication DTCs for ECUs connected to other buses are also stored.
When any of the following malfunctions occurs, many DTCs are likely to be output from many ECUs. Because of this, it may be difficult to determine the probable malfunctioning part.
Short between CAN wires (CANH and CANL)
Short between a CAN wire (CANH or CANL) and ground
Short between a CAN wire (CANH or CANL) and +B
Open in a CAN branch wire (CANH or CANL) of an ECU or sensor
Open in a CAN main wire (CANH or CANL) between 2 ECUs that have a terminating resistor
CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION
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 on the vehicle.
Tech Tips
The names of ECUs and sensors shown on the GTS display may differ from those shown in the DTC Table by ECU section that follows.
ECU/Sensor Name | GTS Display | Installed on |
---|---|---|
ECM | ECM (Engine) | All vehicles |
Brake actuator assembly (skid control ECU) | Skid Control (ABS/VSC/TRAC) | All vehicles |
Spiral with sensor cable sub-assembly (steering angle sensor) | Spiral cable (Steering Angle Sensor) | Vehicles with VSC |
Air conditioning amplifier assembly | Air Conditioning Amplifier | Vehicles with automatic air conditioning system or manual air conditioning system |
Airbag sensor assembly | Airbag | Vehicles with airbag system |
Certification ECU (smart key ECU assembly) | Certification (Smart) | Vehicles with entry and start system |
4 wheel drive control ECU | Four Wheel Drive Control | Vehicles with 4WD |
Navigation receiver assembly | Display and Navigation (AVN1) | Vehicles with navigation system |
Radio and display receiver assembly | Display and Navigation (AVN1) | Vehicles with audio and visual system (for radio and display type) |
Headlight leveling ECU assembly | Headlight swivel (AFS) | Vehicles with LED headlight or headlight cleaner system |
Engine stop and start ECU | Stop and Go/Start | Vehicles with stop and start system |
Combination meter assembly | Combination Meter | All vehicles |
Telematics transceiver | DCM | Vehicles with telematics transceiver |
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 trouble cannot be determined solely from the DTCs. Perform troubleshooting according to "How to Proceed with Troubleshooting".
If system function temporarily returns to normal, DTCs may not be output again even though the following DTC check procedures are used.
ECM
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Detection Precondition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U1103 | Lost Communication with Stop and Start Control Module | The ECM is unable to receive certain data from the engine stop and start ECU for 1 second or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 2 seconds. | Displays messages on the multi-information display. | The DTC remains stored until it is cleared using the GTS. |
BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Detection Precondition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0073 | Control Module Communication Bus Off | Either condition is met:
|
Both conditions are met:
|
Turn the ignition switch to ON and wait at least 60 seconds. |
|
The DTC remains stored until it is cleared using the GTS. |
U0073 | Control Module Communication Bus Off | Either condition is met:
|
Both conditions are met:
|
Turn the ignition switch to ON and wait at least 60 seconds. |
|
The DTC remains stored until it is cleared using the GTS. |
U0100 | Lost Communication With ECM/PCM "A" | The brake actuator assembly (skid control ECU) is unable to receive certain data from the ECM for 2 seconds or more. | All conditions are met:
|
Drive the vehicle for 3 seconds at a speed of 15 km/h (9 mph) or more. | SLIP indicator light illuminates. | The DTC remains stored until it is cleared using the GTS. |
U0114 | Lost Communication With Four-Wheel Drive Clutch Control Module | The brake actuator assembly (skid control ECU) is unable to receive certain data from the 4 wheel drive control ECU for 1.2 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 2.2 seconds. |
|
The DTC remains stored until it is cleared using the GTS. |
U0124 | Lost Communication With Lateral Acceleration Sensor Module | Either condition is met:
|
Both conditions are met:
|
Turn the ignition switch to ON and wait at least 60 seconds. |
|
The DTC remains stored until it is cleared using the GTS. |
U0126 | Lost Communication With Steering Angle Sensor Module | Either condition is met:
|
Both conditions are met:
|
Turn the ignition switch to ON and wait at least 60 seconds. | SLIP indicator light illuminates. | The DTC remains stored until it is cleared using the GTS. |
AIR CONDITIONING AMPLIFIER ASSEMBLY (for Automatic Air Conditioning System, Manual Air Conditioning System)
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Detection Precondition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0100 | Lost Communication With ECM/PCM "A" | The air conditioning amplifier assembly is unable to receive certain data from the ECM for 5 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 5 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
U0155 | Lost Communication With Instrument Panel Cluster (IPC) Control Module | The air conditioning amplifier assembly is unable to receive certain data from the combination meter assembly for 5 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 5 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
COMBINATION METER ASSEMBLY
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Check Procedure | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0100 | Lost Communication with ECM/PCM "A" | The combination meter assembly is unable to receive certain data from the ECM for 2 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 2 seconds. | MIL illuminates. | The DTC remains stored until it is cleared using the GTS. |
U0129 | Lost Communication with Brake System Control Module | Either condition is met:
|
Both conditions are met:
|
Turn the ignition switch to ON and wait at least 3 seconds. | SLIP indicator light illuminates. | The DTC remains stored until it is cleared using the GTS. |
U0151 | Lost Communication with Restraints Control Module | The combination meter assembly is unable to receive certain data from the airbag sensor assembly for 10 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 10 seconds. | The SRS warning light illuminates. | The DTC remains stored until it is cleared using the GTS. |
NAVIGATION RECEIVER ASSEMBLY (w/ Navigation System)
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Detection Precondition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0073 | Sending Malfunction (Navigation to APGS) | The navigation receiver assembly is unable to send or receive data 10 times consecutively. | - | Turn the ignition switch to ON and wait at least 1 second. | - | The DTC remains stored until it is cleared using the GTS. |
U0100 | Engine ECU Communication | Either condition is met:
|
Both conditions are met:
|
Turn the ignition switch to ON and wait at least 13 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
U0129 | VSC(ECB*)ECU Communication | The navigation receiver assembly is unable to receive certain data from the brake actuator assembly (skid control ECU) for 1 second or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 2 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
U0155 | Meter ECU Communication | Either condition is met:
|
Both conditions are met:
|
Turn the ignition switch to ON and wait at least 31 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
ECB*: Electronically Controlled Brake System
RADIO AND DISPLAY RECEIVER ASSEMBLY (w/ Audio and Visual System [for Radio and Display Type])
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Detection Precondition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0073 | Sending Malfunction (Navigation to APGS) | The radio and display receiver assembly is unable to send or receive data 10 times consecutively. | - | Turn the ignition switch to ON and wait at least 1 second. | - | The DTC remains stored until it is cleared using the GTS. |
U0100 | Engine ECU Communication | Either condition is met:
|
Both conditions are met:
|
Turn the ignition switch to ON and wait at least 13 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
U0129 | VSC(ECB*)ECU Communication | The radio and display receiver assembly is unable to receive certain data from the brake actuator assembly (skid control ECU) for 1 second or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 2 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
U0155 | Meter ECU Communication | Either condition is met:
|
Both conditions are met:
|
Turn the ignition switch to ON and wait at least 31 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
U0164 | Air Conditioner ECU Communication | The radio and display receiver assembly is unable to receive certain data from the air conditioning amplifier assembly for 10 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 11 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
ECB*: Electronically Controlled Brake System
4 WHEEL DRIVE CONTROL ECU (for 4WD)
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Detection Precondition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0100 | Lost Communication with ECM/PCM "A" | Either condition is met:
|
Both conditions are met:
|
Turn the ignition switch to ON and wait at least 8.12 seconds. |
|
The DTC remains stored until it is cleared using the GTS. |
U0122 | Lost Communication With Vehicle Dynamics Control Module | The 4 wheel drive control ECU is unable to receive certain data from the brake actuator assembly (skid control ECU) for 0.72 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 3.72 seconds. |
|
The DTC remains stored until it is cleared using the GTS. |
CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Entry and Start System)
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Detection Precondition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0100 | Lost Communication With ECM/PCM "A" | The certification ECU (smart key ECU assembly) is unable to receive certain data from the ECM for 10 seconds or more. | Both conditions are met:
|
Wait 20 seconds after turning the ignition switch ACC or ON. | - | The DTC remains 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) is unable to receive certain data from the combination meter assembly for 10 seconds or more. | Both conditions are met:
|
Wait 20 seconds after turning the ignition switch ACC or ON. | - | The DTC remains stored until it is cleared using the GTS. |
U1103 | Lost Communication with Stop and Start Control Module | The certification ECU (smart key ECU assembly) is unable to receive certain data from the engine stop and start ECU for 10 seconds or more. | Both conditions are met:
|
Wait 20 seconds after turning the ignition switch ACC or ON. | - | The DTC remains stored until it is cleared using the GTS. |
CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Entry and Start System)
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Detection Precondition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0100 | ECM Communication | The certification ECU (smart key ECU assembly) is unable to receive certain data from the ECM for 10 seconds or more. | Both conditions are met:
|
Wait 20 seconds after turning the ignition switch ACC or ON. | - | The DTC remains stored until it is cleared using the GTS. |
U0129 | Vehicle Speed Signal Communication | The certification ECU (smart key ECU assembly) is unable to receive certain data from the brake actuator assembly (skid control ECU) for 10 seconds or more. | Both conditions are met:
|
Wait 20 seconds after turning the ignition switch ACC or ON. | - | The DTC remains 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) is unable to receive certain data from the combination meter assembly for 10 seconds or more. | Both conditions are met:
|
Wait 20 seconds after turning the ignition switch ACC or ON. | - | The DTC remains stored until it is cleared using the GTS. |
U1103 | Lost Communication with Stop and Start Control Module | The certification ECU (smart key ECU assembly) is unable to receive certain data from the engine stop and start ECU for 10 seconds or more. | Both conditions are met:
|
Wait 20 seconds after turning the ignition switch ACC or ON. | - | The DTC remains stored until it is cleared using the GTS. |
CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Entry and Start System)
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Detection Precondition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0100 | Lost Communication with ECM/PCM "A" | The certification ECU (smart key ECU assembly) is unable to receive certain data from the ECM for 10 seconds or more. | Both conditions are met:
|
Wait 20 seconds after turning the ignition switch ACC or ON. | - | The DTC remains stored until it is cleared using the GTS. |
HEADLIGHT LEVELING ECU ASSEMBLY (for LED Headlight or w/ Headlight Cleaner System)
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Detection Precondition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0100 | Lost Communication with ECM/PCM "A" | The headlight leveling ECU assembly is unable to receive certain data from the ECM for 10 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 20 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
U0129 | Lost Communication with Brake System Control Module | The headlight leveling ECU assembly is unable to receive certain data from the brake actuator assembly (skid control ECU) for 10 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 20 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
U0142 | Lost Communication with Body Control Module "B" | The headlight leveling ECU assembly is unable to receive certain data from the combination meter assembly for 10 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 20 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
U1000* | CAN Communication Failure(Message Registry) | CAN communication malfunction (message register) | Turn the ignition switch to ON. | Turn the ignition switch to ON. | - | The DTC remains stored until it is cleared using the GTS. |
*: Refer to the Lighting System.
ENGINE STOP AND START ECU (w/ Stop and Start System) / GTS Display "Stop and Start"
Tech Tips
DTC communication uses the CAN communication system.
DTC No. | Detection Item | DTC Detection Condition | DTC Detection Precondition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0100 | Lost Communication with ECM/PCM "A" | The engine stop and start ECU is unable to receive certain data from the ECM for 0.92 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 1.92 seconds. | Stop and start indicator light illuminates. | The DTC remains stored until it is cleared using the GTS. |
U0114 | Lost Communication with Four-Wheel Drive Clutch Control Module | The engine stop and start ECU is unable to receive certain data from the 4 wheel drive control ECU for 0.92 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 1.92 seconds. | Stop and start indicator light illuminates. | The DTC remains 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 is unable to receive certain data from the brake actuator assembly (skid control ECU) for 2.2 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 4.3 seconds. | Stop and start indicator light illuminates. | The DTC remains stored until it is cleared using the GTS. |
U0126 | Lost Communication with Steering Angle Sensor Module | The engine stop and start ECU is unable to receive certain data from the spiral with sensor cable sub-assembly (steering angle sensor) for 0.72 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 1.72 seconds. | Stop and start indicator light illuminates. | The DTC remains stored until it is cleared using the GTS. |
U0151 | Lost Communication with SRS Airbag ECU | The engine stop and start ECU is unable to receive certain data from the airbag sensor assembly for 10.6 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 11.6 seconds. | Stop and start indicator light illuminates. | The DTC remains stored until it is cleared using the GTS. |
U0155 | Lost Communication with Instrument Panel Cluster Control Module (Combination Meter) | The engine stop and start ECU is unable to receive certain data from the combination meter assembly for 3.6 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 4.6 seconds. | Stop and start indicator light illuminates. | The DTC remains stored until it is cleared using the GTS. |
U0164 | Lost Communication with HVAC Control Module | The engine stop and start ECU is unable to receive certain data from the air conditioning amplifier assembly for 10.6 seconds or more. | Both conditions are met:
|
Turn the ignition switch to ON and wait at least 11.6 seconds. | Stop and start indicator light illuminates. | The DTC remains stored until it is cleared using the GTS. |
TELEMATICS TRANSCEIVER (w/ Telematics Transceiver) / GTS Display "Telematics"
Tech Tips
DTC communication uses the CAN communication system.
DTC | Detection Item | DTC Detection Condition | DTC Detection Pre-condition | DTC Check Procedure | Warning Indication in Meter | DTC Storage Method |
---|---|---|---|---|---|---|
U0100 | Lost Communication with ECM/PCM "A" | The telematics transceiver is unable to receive certain data from the ECM for approximately 5 seconds or more. | 10 seconds or more elapse after turning the ignition switch to ON. | Turn the ignition switch to ON and wait at least approximately 15 seconds. | - | The DTC remains stored until it is cleared using the GTS. |
AIRBAG SENSOR ASSEMBLY (w/ Airbag System)
Tech Tips
The airbag sensor assembly is connected to the CAN communication system but CAN communication DTCs are not stored.
SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY (STEERING ANGLE SENSOR) (w/ VSC)
Tech Tips
The spiral with sensor cable sub-assembly (steering angle sensor) is connected to the CAN communication system but CAN communication DTCs are not stored.
Regarding the past communication error of ECUs and sensors connected to the V bus (in this case, normal was displayed when performing the CAN bus check, but communication DTCs are output), the probable CAN branch that had a malfunction can be determined based on the following DTC combination table.
DTC COMBINATION TABLE (OPEN IN CAN BRANCH OF V BUS, PAST COMMUNICATION ERROR)
Regarding the past communication error of ECUs and sensors connected to the V bus (in this case, normal was displayed when performing the CAN bus check, but communication DTCs are output), the probable CAN branch that had a malfunction can be determined based on the following DTC combination table.
Tech Tips
Based on the table below and DTCs output from ECUs connected via CAN communication, the probable part for which communication stop occurred can be determined.
Regarding an open in a CAN branch and a communication stop that is currently occurring, the malfunctioning part can be confirmed easily by performing the CAN bus check using the GTS because the ECU or sensor connected to the CAN branch does not respond (the ECU or sensor name will not be displayed on the screen).
If an open in a CAN main bus wire, a short between the CAN bus lines (CANH and CANL) or a +B or ground short in the CAN bus occurs, DTCs of almost all ECUs (or sensors) on the CAN bus may be output, or a message indicating a communication error may be displayed on the GTS screen. In this case, check the resistance of the CAN bus (steps 7 to 9) first.
If an open occurs in just one of the lines of a CAN branch, DTCs which are not related to malfunctioning parts may be output (DTCs may be displayed randomly), or a message indicating a communication error may be displayed.
○: DTC is output.
X: DTC is likely output.
▲: DTC is unlikely output.
-: DTC is not output.
Output from | Output DTC | Trouble Mode (Open in one side of CAN branch wire) | |||
---|---|---|---|---|---|
V Bus | |||||
Center Airbag Sensor Communication Stop Mode |
Air Conditioning Amplifier Communication Stop Mode |
AFS ECU Communication Stop Mode |
Navigation ECU Communication Stop Mode |
||
Air Conditioning Amplifier Assembly | U0100 | ▲ | X | ▲ | ▲ |
U0155 | ▲ | X | ▲ | ▲ | |
Headlight Leveling ECU Assembly | U0100 | ▲ | ▲ | X | ▲ |
U0129 | ▲ | ▲ | X | ▲ | |
U0142 | ▲ | ▲ | X | ▲ | |
Navigation Receiver Assembly | U0100 | ▲ | ▲ | ▲ | X |
U0129 | ▲ | ▲ | ▲ | X | |
U0155 | ▲ | ▲ | ▲ | X | |
Radio and Display Receiver Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0129 | ▲ | ▲ | ▲ | ▲ | |
U0155 | ▲ | ▲ | ▲ | ▲ | |
U0164 | ▲ | X | ▲ | ▲ | |
Engine Stop and Start ECU | U0100 | ▲ | ▲ | ▲ | ▲ |
U0114 | ▲ | ▲ | ▲ | ▲ | |
U0121 | ▲ | ▲ | ▲ | ▲ | |
U0126 | ▲ | ▲ | ▲ | ▲ | |
U0151 | X | ▲ | ▲ | ▲ | |
U0155 | ▲ | ▲ | ▲ | ▲ | |
U0164 | ▲ | X | ▲ | ▲ | |
ECM | U1103 | ▲ | ▲ | ▲ | ▲ |
4 Wheel Drive Control ECU | U0100 | ▲ | ▲ | ▲ | ▲ |
U0122 | ▲ | ▲ | ▲ | ▲ | |
Certification ECU (Smart Key ECU Assembly) <Entry&Start> |
U0100 | ▲ | ▲ | ▲ | ▲ |
U0155 | ▲ | ▲ | ▲ | ▲ | |
U1103 | ▲ | ▲ | ▲ | ▲ | |
Certification ECU (Smart Key ECU Assembly) <Power Source Control> |
U0100 | ▲ | ▲ | ▲ | ▲ |
U0129 | ▲ | ▲ | ▲ | ▲ | |
U0155 | ▲ | ▲ | ▲ | ▲ | |
U1103 | ▲ | ▲ | ▲ | ▲ | |
Certification ECU (Smart Key ECU Assembly) <Starting Control> |
U0100 | ▲ | ▲ | ▲ | ▲ |
Combination Meter Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0129 | ▲ | ▲ | ▲ | ▲ | |
U0151 | X | ▲ | ▲ | ▲ | |
Brake Actuator Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0114 | ▲ | ▲ | ▲ | ▲ | |
U0124 | X | ▲ | ▲ | ▲ | |
U0126 | ▲ | ▲ | ▲ | ▲ | |
Telematics Transceiver | U0100 | ▲ | ▲ | ▲ | ▲ |
Airbag Sensor Assembly | - | - | - | - | - |
Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) | - | - | - | - | - |
Output from | Output DTC | Trouble Mode (Open in one side of CAN branch wire) | |||
---|---|---|---|---|---|
V Bus | |||||
Steering Angle Sensor Communication Stop Mode |
Skid Control ECU Communication Stop Mode |
DLC3 | Engine Stop and Start ECU Communication Stop Mode |
||
Air Conditioning Amplifier Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0155 | ▲ | ▲ | ▲ | ▲ | |
Headlight Leveling ECU Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0129 | ▲ | X | ▲ | ▲ | |
U0142 | ▲ | ▲ | ▲ | ▲ | |
Navigation Receiver Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0129 | ▲ | ▲ | ▲ | ▲ | |
U0155 | ▲ | ▲ | ▲ | ▲ | |
Radio and Display Receiver Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0129 | ▲ | X | ▲ | ▲ | |
U0155 | ▲ | ▲ | ▲ | ▲ | |
U0164 | ▲ | ▲ | ▲ | ▲ | |
Engine Stop and Start ECU | U0100 | ▲ | ▲ | ▲ | X |
U0114 | ▲ | ▲ | ▲ | X | |
U0121 | ▲ | X | ▲ | X | |
U0126 | X | ▲ | ▲ | X | |
U0151 | ▲ | ▲ | ▲ | X | |
U0155 | ▲ | ▲ | ▲ | X | |
U0164 | ▲ | ▲ | ▲ | X | |
ECM | U1103 | ▲ | ▲ | ▲ | X |
4 Wheel Drive Control ECU | U0100 | ▲ | ▲ | ▲ | ▲ |
U0122 | ▲ | X | ▲ | ▲ | |
Certification ECU (Smart Key ECU Assembly) <Entry&Start> |
U0100 | ▲ | ▲ | ▲ | ▲ |
U0155 | ▲ | ▲ | ▲ | ▲ | |
U1103 | ▲ | ▲ | ▲ | X | |
Certification ECU (Smart Key ECU Assembly) <Power Source Control> |
U0100 | ▲ | ▲ | ▲ | ▲ |
U0129 | ▲ | X | ▲ | ▲ | |
U0155 | ▲ | ▲ | ▲ | ▲ | |
U1103 | ▲ | ▲ | ▲ | X | |
Certification ECU (Smart Key ECU Assembly) <Starting Control> |
U0100 | ▲ | ▲ | ▲ | ▲ |
Combination Meter Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0129 | ▲ | X | ▲ | ▲ | |
U0151 | ▲ | ▲ | ▲ | ▲ | |
Brake Actuator Assembly | U0100 | ▲ | X | ▲ | ▲ |
U0114 | ▲ | X | ▲ | ▲ | |
U0124 | ▲ | X | ▲ | ▲ | |
U0126 | X | X | ▲ | ▲ | |
Telematics Transceiver | U0100 | ▲ | ▲ | ▲ | ▲ |
Airbag Sensor Assembly | - | - | - | - | - |
Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) | - | - | - | - | - |
Output from | Output DTC | Trouble Mode (Open in one side of CAN branch wire) | |||
---|---|---|---|---|---|
V Bus | |||||
4WD Control ECU Communication Stop Mode |
Certification ECU Communication Stop Mode |
Audio Receiver Assembly Communication Stop Mode |
DCM Communication Stop Mode |
||
Air Conditioning Amplifier Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0155 | ▲ | ▲ | ▲ | ▲ | |
Headlight Leveling ECU Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0129 | ▲ | ▲ | ▲ | ▲ | |
U0142 | ▲ | ▲ | ▲ | ▲ | |
Navigation Receiver Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0129 | ▲ | ▲ | ▲ | ▲ | |
U0155 | ▲ | ▲ | ▲ | ▲ | |
Radio and Display Receiver Assembly | U0100 | ▲ | ▲ | X | ▲ |
U0129 | ▲ | ▲ | X | ▲ | |
U0155 | ▲ | ▲ | X | ▲ | |
U0164 | ▲ | ▲ | X | ▲ | |
Engine Stop and Start ECU | U0100 | ▲ | ▲ | ▲ | ▲ |
U0114 | X | ▲ | ▲ | ▲ | |
U0121 | ▲ | ▲ | ▲ | ▲ | |
U0126 | ▲ | ▲ | ▲ | ▲ | |
U0151 | ▲ | ▲ | ▲ | ▲ | |
U0155 | ▲ | ▲ | ▲ | ▲ | |
U0164 | ▲ | ▲ | ▲ | ▲ | |
ECM | U1103 | ▲ | ▲ | ▲ | ▲ |
4 Wheel Drive Control ECU | U0100 | X | ▲ | ▲ | ▲ |
U0122 | X | ▲ | ▲ | ▲ | |
Certification ECU (Smart Key ECU Assembly) <Entry&Start> |
U0100 | ▲ | X | ▲ | ▲ |
U0155 | ▲ | X | ▲ | ▲ | |
U1103 | ▲ | X | ▲ | ▲ | |
Certification ECU (Smart Key ECU Assembly) <Power Source Control> |
U0100 | ▲ | X | ▲ | ▲ |
U0129 | ▲ | X | ▲ | ▲ | |
U0155 | ▲ | X | ▲ | ▲ | |
U1103 | ▲ | X | ▲ | ▲ | |
Certification ECU (Smart Key ECU Assembly) <Starting Control> |
U0100 | ▲ | X | ▲ | ▲ |
Combination Meter Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0129 | ▲ | ▲ | ▲ | ▲ | |
U0151 | ▲ | ▲ | ▲ | ▲ | |
Brake Actuator Assembly | U0100 | ▲ | ▲ | ▲ | ▲ |
U0114 | X | ▲ | ▲ | ▲ | |
U0124 | ▲ | ▲ | ▲ | ▲ | |
U0126 | ▲ | ▲ | ▲ | ▲ | |
Telematics Transceiver | U0100 | ▲ | ▲ | ▲ | X |
Airbag Sensor Assembly | - | - | - | - | - |
Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) | - | - | - | - | - |
Output from | Output DTC | Trouble Mode (Open in CAN branch wire) | |||
---|---|---|---|---|---|
V Bus | |||||
Center Airbag Sensor Communication Stop Mode |
Air Conditioning Amplifier Communication Stop Mode |
AFS ECU Communication Stop Mode |
Navigation ECU Communication Stop Mode |
||
Air Conditioning Amplifier Assembly | U0100 | - | ○ | - | - |
U0155 | - | ○ | - | - | |
Headlight Leveling ECU Assembly | U0100 | - | - | ○ | - |
U0129 | - | - | ○ | - | |
U0142 | - | - | ○ | - | |
Navigation Receiver Assembly | U0100 | - | - | - | ○ |
U0129 | - | - | - | ○ | |
U0155 | - | - | - | ○ | |
Radio and Display Receiver Assembly | U0100 | - | - | - | - |
U0129 | - | - | - | - | |
U0155 | - | - | - | - | |
U0164 | - | ○ | - | - | |
Engine Stop and Start ECU | U0100 | - | - | - | |
U0114 | - | - | - | - | |
U0121 | - | - | - | - | |
U0126 | - | - | - | - | |
U0151 | ○ | - | - | - | |
U0155 | - | - | - | - | |
U0164 | - | ○ | - | - | |
ECM | U1103 | - | - | - | - |
4 Wheel Drive Control ECU | U0100 | - | - | - | - |
U0122 | - | - | - | - | |
Certification ECU (Smart Key ECU Assembly) <Entry&Start> |
U0100 | - | - | - | - |
U0155 | - | - | - | - | |
U1103 | - | - | - | - | |
Certification ECU (Smart Key ECU Assembly) <Power Source Control> |
U0100 | - | - | - | - |
U0129 | - | - | - | - | |
U0155 | - | - | - | - | |
U1103 | - | - | - | - | |
Certification ECU (Smart Key ECU Assembly) <Starting Control> |
U0100 | - | - | - | - |
Combination Meter Assembly | U0100 | - | - | - | - |
U0129 | - | - | - | - | |
U0151 | ○ | - | - | - | |
Brake Actuator Assembly | U0100 | - | - | - | - |
U0114 | - | - | - | - | |
U0124 | ○ | - | - | - | |
U0126 | - | - | - | - | |
Telematics Transceiver | U0100 | - | - | - | - |
Airbag Sensor Assembly | - | - | - | - | - |
Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) | - | - | - | - | - |
Output from | Output DTC | Trouble Mode (Open in CAN branch wire) | |||
---|---|---|---|---|---|
V Bus | |||||
Steering Angle Sensor Communication Stop Mode |
Skid Control ECU Communication Stop Mode |
DLC3 | Engine Stop and Start ECU Communication Stop Mode |
||
Air Conditioning Amplifier Assembly | U0100 | - | - | - | - |
U0155 | - | - | - | - | |
Headlight Leveling ECU Assembly | U0100 | - | - | - | - |
U0129 | - | ○ | - | - | |
U0142 | - | - | - | - | |
Navigation Receiver Assembly | U0100 | - | - | - | - |
U0129 | - | - | - | - | |
U0155 | - | - | - | - | |
Radio and Display Receiver Assembly | U0100 | - | - | - | - |
U0129 | - | ○ | - | - | |
U0155 | - | - | - | - | |
U0164 | - | - | - | - | |
Engine Stop and Start ECU | U0100 | - | - | - | ○ |
U0114 | - | - | - | ○ | |
U0121 | - | ○ | - | ○ | |
U0126 | ○ | - | - | ○ | |
U0151 | - | - | - | ○ | |
U0155 | - | - | - | ○ | |
U0164 | - | - | - | ○ | |
ECM | U1103 | - | - | - | ○ |
4 Wheel Drive Control ECU | U0100 | - | - | - | - |
U0122 | - | ○ | - | - | |
Certification ECU (Smart Key ECU Assembly) <Entry&Start> |
U0100 | - | - | - | - |
U0155 | - | - | - | - | |
U1103 | - | - | - | ○ | |
Certification ECU (Smart Key ECU Assembly) <Power Source Control> |
U0100 | - | - | - | - |
U0129 | - | ○ | - | - | |
U0155 | - | - | - | - | |
U1103 | - | - | - | ○ | |
Certification ECU (Smart Key ECU Assembly) <Starting Control> |
U0100 | - | - | - | - |
Combination Meter Assembly | U0100 | - | - | - | - |
U0129 | - | ○ | - | - | |
U0151 | - | - | - | - | |
Brake Actuator Assembly | U0100 | - | ○ | - | - |
U0114 | - | ○ | - | - | |
U0124 | - | ○ | - | - | |
U0126 | ○ | ○ | - | - | |
Telematics Transceiver | U0100 | - | - | - | - |
Airbag Sensor Assembly | - | - | - | - | - |
Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) | - | - | - | - | - |
Output from | Output DTC | Trouble Mode (Open in CAN branch wire) | |||
---|---|---|---|---|---|
V Bus | |||||
4WD Control ECU Communication Stop Mode |
Certification ECU Communication Stop Mode |
Audio Receiver Assembly Communication Stop Mode |
DCM Communication Stop Mode |
||
Air Conditioning Amplifier Assembly | U0100 | - | - | - | - |
U0155 | - | - | - | - | |
Headlight Leveling ECU Assembly | U0100 | - | - | - | - |
U0129 | - | - | - | - | |
U0142 | - | - | - | - | |
Navigation Receiver Assembly | U0100 | - | - | - | - |
U0129 | - | - | - | - | |
U0155 | - | - | - | - | |
Radio and Display Receiver Assembly | U0100 | - | - | ○ | - |
U0129 | - | - | ○ | - | |
U0155 | - | - | ○ | - | |
U0164 | - | - | ○ | - | |
Engine Stop and Start ECU | U0100 | - | - | - | - |
U0114 | ○ | - | - | - | |
U0121 | - | - | - | - | |
U0126 | - | - | - | - | |
U0151 | - | - | - | - | |
U0155 | - | - | - | - | |
U0164 | - | - | - | - | |
ECM | U1103 | - | - | - | - |
4 Wheel Drive Control ECU | U0100 | ○ | - | - | - |
U0122 | ○ | - | - | - | |
Certification ECU (Smart Key ECU Assembly) <Entry&Start> |
U0100 | - | ○ | - | - |
U0155 | - | ○ | - | - | |
U1103 | - | ○ | - | - | |
Certification ECU (Smart Key ECU Assembly) <Power Source Control> |
U0100 | - | ○ | - | - |
U0129 | - | ○ | - | - | |
U0155 | - | ○ | - | - | |
U1103 | - | ○ | - | - | |
Certification ECU (Smart Key ECU Assembly) <Starting Control> |
U0100 | - | ○ | - | - |
Combination Meter Assembly | U0100 | - | - | - | - |
U0129 | - | - | - | - | |
U0151 | - | - | - | ||
Brake Actuator Assembly | U0100 | - | - | - | - |
U0114 | ○ | - | - | - | |
U0124 | - | - | - | - | |
U0126 | - | - | - | - | |
Telematics Transceiver | U0100 | - | - | - | ○ |
Airbag Sensor Assembly | - | - | - | - | - |
Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) | - | - | - | - | - |
Output from | Output DTC | Trouble Mode (Open in one side of CAN main bus wire) | ||
---|---|---|---|---|
V Bus | ||||
ECM Communication Stop Mode |
No. 1 CAN Junction Connector - No. 2 CAN Junction Connector | Combination Meter ECU Communication Stop Mode |
||
Air Conditioning Amplifier Assembly | U0100 | X | X | ▲ |
U0155 | ▲ | ▲ | X | |
Headlight Leveling ECU Assembly | U0100 | X | X | ▲ |
U0129 | ▲ | ▲ | ▲ | |
U0142 | ▲ | ▲ | X | |
Navigation Receiver Assembly | U0100 | X | ▲ | ▲ |
U0129 | ▲ | X | ▲ | |
U0155 | ▲ | X | X | |
Radio and Display Receiver Assembly | U0100 | X | ▲ | ▲ |
U0129 | ▲ | X | ▲ | |
U0155 | ▲ | X | X | |
U0164 | ▲ | X | ▲ | |
Engine Stop and Start ECU | U0100 | X | X | ▲ |
U0114 | ▲ | X | ▲ | |
U0121 | ▲ | ▲ | ▲ | |
U0126 | ▲ | ▲ | ▲ | |
U0151 | ▲ | ▲ | ▲ | |
U0155 | ▲ | ▲ | X | |
U0164 | ▲ | X | ▲ | |
ECM | U1103 | X | X | ▲ |
4 Wheel Drive Control ECU | U0100 | X | ▲ | ▲ |
U0122 | ▲ | X | ▲ | |
Certification ECU (Smart Key ECU Assembly) <Entry&Start> |
U0100 | X | ▲ | ▲ |
U0155 | ▲ | X | X | |
U1103 | ▲ | X | ▲ | |
Certification ECU (Smart Key ECU Assembly) <Power Source Control> |
U0100 | X | ▲ | ▲ |
U0129 | ▲ | X | ▲ | |
U0155 | ▲ | X | X | |
U1103 | ▲ | X | ▲ | |
Certification ECU (Smart Key ECU Assembly) <Starting Control> |
U0100 | X | ▲ | ▲ |
Combination Meter Assembly | U0100 | X | X | X |
U0129 | ▲ | ▲ | X | |
U0151 | ▲ | ▲ | X | |
Brake Actuator Assembly | U0100 | X | X | ▲ |
U0114 | ▲ | X | ▲ | |
U0124 | ▲ | ▲ | ▲ | |
U0126 | ▲ | ▲ | ▲ | |
Telematics Transceiver | U0100 | X | X | ▲ |
Airbag Sensor Assembly | - | - | - | - |
Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) | - | - | - | - |
Output from | Output DTC | Trouble Mode (Open in CAN main bus wire) | ||
---|---|---|---|---|
V Bus | ||||
ECM Communication Stop Mode |
No. 1 CAN Junction Connector - No. 2 CAN Junction Connector | Combination Meter ECU Communication Stop Mode |
||
Air Conditioning Amplifier Assembly | U0100 | ○ | ○ | - |
U0155 | - | - | ○ | |
Headlight Leveling ECU Assembly | U0100 | ○ | ○ | - |
U0129 | - | - | - | |
U0142 | - | - | ○ | |
Navigation Receiver Assembly | U0100 | ○ | - | - |
U0129 | - | ○ | - | |
U0155 | - | ○ | ○ | |
Radio and Display Receiver Assembly | U0100 | ○ | - | - |
U0129 | - | ○ | - | |
U0155 | - | ○ | ○ | |
U0164 | - | ○ | - | |
Engine Stop and Start ECU | U0100 | ○ | ○ | - |
U0114 | - | ○ | - | |
U0121 | - | - | - | |
U0126 | - | - | - | |
U0151 | - | - | - | |
U0155 | - | - | ○ | |
U0164 | - | ○ | - | |
ECM | U1103 | ○ | ○ | - |
4 Wheel Drive Control ECU | U0100 | ○ | - | - |
U0122 | - | ○ | - | |
Certification ECU (Smart Key ECU Assembly) <Entry&Start> |
U0100 | ○ | - | - |
U0155 | - | ○ | ○ | |
U1103 | - | ○ | - | |
Certification ECU (Smart Key ECU Assembly) <Power Source Control> |
U0100 | ○ | - | - |
U0129 | - | ○ | - | |
U0155 | - | ○ | ○ | |
U1103 | - | ○ | - | |
Certification ECU (Smart Key ECU Assembly) <Starting Control> |
U0100 | ○ | - | - |
Combination Meter Assembly | U0100 | ○ | ○ | ○ |
U0129 | - | - | ○ | |
U0151 | - | - | ○ | |
Brake Actuator Assembly | U0100 | ○ | ○ | - |
U0114 | - | ○ | - | |
U0124 | - | - | - | |
U0126 | - | - | - | |
Telematics Transceiver | U0100 | ○ | ○ | - |
Airbag Sensor Assembly | - | - | - | - |
Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) | - | - | - | - |
Output from | Output DTC | Trouble Mode (Short) | |
---|---|---|---|
V Bus | |||
CANH - CANL | CANH - GND CANL - GND |
||
Air Conditioning Amplifier Assembly | U0100 | ○ | ○ |
U0155 | ○ | ○ | |
Headlight Leveling ECU Assembly | U0100 | ○ | ○ |
U0129 | ○ | ○ | |
U0142 | ○ | ○ | |
Navigation Receiver Assembly | U0100 | ○ | ○ |
U0129 | ○ | ○ | |
U0155 | ○ | ○ | |
Radio and Display Receiver Assembly | U0100 | ○ | ○ |
U0129 | ○ | ○ | |
U0155 | ○ | ○ | |
U0164 | ○ | ○ | |
Engine Stop and Start ECU | U0100 | ○ | ○ |
U0114 | ○ | ○ | |
U0121 | ○ | ○ | |
U0126 | ○ | ○ | |
U0151 | ○ | ○ | |
U0155 | ○ | ○ | |
U0164 | ○ | ○ | |
ECM | U1103 | ○ | ○ |
4 Wheel Drive Control ECU | U0100 | ○ | ○ |
U0122 | ○ | ○ | |
Certification ECU (Smart Key ECU Assembly) <Entry&Start> |
U0100 | ○ | ○ |
U0155 | ○ | ○ | |
U1103 | ○ | ○ | |
Certification ECU (Smart Key ECU Assembly) <Power Source Control> |
U0100 | ○ | ○ |
U0129 | ○ | ○ | |
U0155 | ○ | ○ | |
U1103 | ○ | ○ | |
Certification ECU (Smart Key ECU Assembly) <Starting Control> |
U0100 | ○ | ○ |
Combination Meter Assembly | U0100 | ○ | ○ |
U0129 | ○ | ○ | |
U0151 | ○ | ○ | |
Brake Actuator Assembly | U0100 | ○ | ○ |
U0114 | ○ | ○ | |
U0124 | ○ | ○ | |
U0126 | ○ | ○ | |
Telematics Transceiver | U0100 | ○ | ○ |
Airbag Sensor Assembly | - | - | - |
Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) | - | - | - |
CAN BUS WAVEFORMS
Tech Tips
This waveform is measured between terminals CANH and GND, and terminals CANL and GND of the DLC3. (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.
If a waveform is not similar to one of the following 3 patterns (Group 1), then an open in a CAN main wire, an open in a CAN branch wire, or a short between a CAN wire (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 output 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 wire (CANH)
Tech Tips
An abnormal waveform is output from an ECU with an open in one of its CAN branch wires. 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 wire is disconnected.
*a | 1 V/DIV. |
*b | 50 μs/DIV. |
Open in a CAN branch wire (CANL)
Tech Tips
An abnormal waveform is output from an ECU with an open in one of its CAN branch wires. 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 wire is disconnected.
*a | 1 V/DIV. |
*b | 50 μs/DIV. |
Open in a CAN main wire (CANH)
Tech Tips
Waveforms of ECUs or sensors that are closer to the DLC3 than the open part are almost normal.
Waveforms of ECUs or sensors that are on the opposite side of the DLC3 from the open part are abnormal.
An open in a CAN main wire 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 connector(s) from the CAN junction connector(s) 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 connector(s) from the CAN junction connector(s) 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 from (Can be Checked in Data List) |
Data Received (Cannot be Checked in Data List) |
Selected System*2 | Relevant Data List Item |
---|---|---|---|---|---|
Engine speed | ECM |
|
|
Engine | Engine Speed |
ABS/VSC/TRC | Engine Revolutions | ||||
Combination Meter | Engine Rpm | ||||
Stop and Start | Engine Spd (ECM) | ||||
Engine coolant temperature | ECM |
|
Certification ECU (smart key ECU assembly) | Engine | Coolant Temp |
Combination Meter | Coolant Temperature | ||||
Air Conditioner | Engine Coolant Temp | ||||
Stop and Start | Coolant Temp | ||||
Stop light switch | Brake actuator assembly (skid control ECU) |
|
Airbag sensor assembly | ABS/VSC/TRC | Stop Light SW |
Power Source Control | Stop Light Switch1 | ||||
Stop and Start | Stop Light SW (ECM) | ||||
Wheel speed signal | Brake actuator assembly (skid control ECU) | 4 wheel drive control ECU |
|
ABS/VSC/TRC |
|
Four Wheel Drive |
|
||||
Steering angle signal | Spiral with sensor cable sub-assembly (steering angle sensor) |
|
|
ABS/VSC/TRC | Steering Angle Sensor |
Stop and Start | Steering Angle | ||||
Vehicle speed | Brake actuator assembly (skid control ECU) |
|
|
ABS/VSC/TRC | Vehicle Speed |
Engine | Vehicle Speed | ||||
Combination Meter | Vehicle Speed Meter | ||||
Four Wheel Drive | Vehicle Speed | ||||
Navigation System | Vehicle Speed | ||||
Stop and Start | Vehicle Spd1 (ABS/VSC) | ||||
Combination meter assembly*1 | - |
|
Combination Meter | Vehicle Speed Meter | |
Ambient temperature | Combination meter assembly | Air conditioning amplifier assembly | - | Combination Meter | Ambient Temperature |
Air Conditioner | Ambient Temp Sensor | ||||
Door courtesy | Combination meter assembly | - |
|
Combination Meter |
|
*1: The combination meter assembly receives a vehicle speed signal from the brake actuator assembly (skid control ECU) and sends the signal to other ECUs.
*2: According to the display on the GTS, read the Data List.
Enter the following menus: Powertrain / Engine / Data List
for 1TR-FE: Click here
for 2TR-FE: Click here
for 1GR-FE: Click here
for 1GD-FTV (w/o EGR System): Click here
for 1GD-FTV (w/o EGR Cooler): Click here
for 1GD-FTV: Click here
for 1GD-FTV (w/ DPF): Click here
for 2GD-FTV (w/o EGR System): Click here
for 2GD-FTV (w/o EGR Cooler): Click here
for 2GD-FTV: Click here
for 2GD-FTV (w/ DPF): Click here
for 2GD-FTV (w/ Urea SCR System): Click here
for 2KD-FTV: Click here
for 5L-E: Click here
Enter the following menus: Chassis / ABS/VSC/TRC / Data List
w/ VSC: Click here
w/o VSC: Click here
Enter the following menus: Body Electrical / Combination Meter / Data List
Enter the following menus: Powertrain / Stop and Start / Data List
Enter the following menus: Body Electrical / Air Conditioner / Data List
for Automatic Air Conditioning System: Click here
for Manual Air Conditioning System: Click here
Enter the following menus: Body Electrical / Power Source Control / Data List
Enter the following menus: Powertrain / Four Wheel Drive / Data List
Enter the following menus: Body Electrical / Navigation System / Data List
w/ Navigation System: Click here
w/ Audio and Visual System (for Radio and Display Type): Click here