CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) DIAGNOSIS SYSTEM


  1. CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION


    1. 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.

      Connected to Code ECU/Sensor Name GTS Display Applicability
      - CGW Central gateway ECU (network gateway ECU)

      • CAN Gateway1

      • CAN Gateway2

      		 Installed on all vehicles
      V bus DLC3 DLC3 - Installed on all vehicles
      Bus 2 ENG ECM ECM (Engine) Installed on all vehicles
      BRK Brake booster with master cylinder assembly (skid control ECU) Skid Control (ABS/VSC/TRAC) Installed on all vehicles
      MB Main body ECU (multiplex network body ECU) Main Body Installed on all vehicles
      A/C Air conditioning amplifier assembly Air Conditioning Amplifier Installed on all vehicles
      EPS Power steering ECU assembly Power Steering (EPS) Installed on all vehicles
      SMT Certification ECU (smart key ECU assembly) Certification (Smart) Installed on all vehicles
      STR Spiral cable with sensor sub-assembly (steering angle sensor) Spiral cable (Steering Angle Sensor) Installed on all vehicles
      SRS Airbag ECU assembly Airbag Installed on all vehicles
      PCN Transmission control ECU assembly Transmission Control Installed on all vehicles
      MET Combination meter sub-assembly Combination Meter Installed on all vehicles
      HV Hybrid vehicle control ECU Hybrid Vehicle Control Installed on all vehicles
      Bus 3 AV Navigation receiver assembly Display and Navigation (AVN) Vehicles with Navigation Receiver Type
      Radio and display receiver assembly Display and Navigation (AVN) Vehicles with Radio and Display Type
      Bus 5 HV Hybrid vehicle control ECU Hybrid Vehicle Control Installed on all vehicles
      PAC Parking assist ECU Parking Assist (Intelligent Parking Assist) Vehicles with Intelligent Parking Assist System
      DS Driving support ECU assembly Driving Support (Cruise Control-ACC) Vehicles with Toyota Safety Sense
      F-MR Millimeter wave radar sensor assembly Front Radar Vehicles with Toyota Safety Sense
      F-CAM Forward recognition camera Front Camera Module Vehicles with Toyota Safety Sense
      Sub bus 15 HV Hybrid vehicle control ECU Hybrid Vehicle Control Installed on all vehicles
      ENG ECM - Installed on all vehicles
      BRK Brake booster with master cylinder assembly (skid control ECU) Skid Control (ABS/VSC/TRAC) Installed on all vehicles

      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.

  2. CAN BUS CHECK

    Tech Tips

    The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the GTS.


    1. Using the GTS, select the 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 Click here.

      Tech Tips

      Different connection statuses are indicated by the background color of ECUs and sensors that are displayed.

      Explanation of CAN 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 (network 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 V bus (the bus that connects the DLC3 to the central gateway ECU (network gateway ECU)) for malfunctions.

    2. 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.

  3. HOW TO INTERPRET CAN BUS CHECK SCREEN


    1. 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 power switch on (IG) (or simulate the driving conditions that enable the malfunction to be reproduced) and select "CAN Bus Check". Then observe the communication status of each ECU on the screen.

    2. 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 lines of HV on the bus 4

      B005YN9C01
      *a Bus 2 *b Bus 4
      *c Sub Bus *d V Bus
      *e Location of Malfunction *f Background color is red

      Tech Tips

      When there are communication stops, ECUs that are present in the vehicle may not be displayed on the CAN Bus Check screen.

    3. 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 sensor whose background color is red) is suspected.

      Example: Open in a CAN branch line for HV on the bus 4

      B005XGBC01
      *a Background color is red *b Background color intermittently becomes yellow or red
      *c Not displayed or background color is yellow or red - -
      Explanation of CAN 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 (network 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.

      • 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 line of HV is also unstable. In addition, in this example, MB is equipped with a gateway function. Therefore, communication is also unstable between the Sub bus ECUs of MB and the bus 4.

      • The example in the illustration shows that HV has a red background color on the CAN Bus Check screen. This indicates a more significant communication stop. In this case, a communication stop of HV is suspected.

    4. If a communication error is indicated on both the bus 4 and Sub bus on the CAN Bus Check screen, suspect any communication stop displayed for the bus 4 first.

      Example: Open in both CAN branch lines of MB on the bus 4

      B005XNQC01
      *a Background color is red *b Not displayed

      Tech Tips


      • In the CAN bus check, it is possible to confirm the communication status of ECUs connected to the bus after connecting the GTS to the DLC3. As for sub bus, it is possible to confirm which sub bus connected ECUs can communicate with a gateway function equipped ECU on the 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 MB has a gateway function and a communication stop in MB is suspected.

    5. 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 lines of MIR-R on the sub bus

      B005YHNC01
      *a Background color is red - -

      Tech Tips


      • A communication error in a sub bus does not affect the 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.)

    6. If both of the bus 2 main bus lines are open, ECUs or sensors that are located farther away from the central gateway ECU (network gateway ECU) than the open part will be displayed as a communication stop on the CAN Bus Check screen.

      (In this case, HVB, R-MGC and ENG background color changes to red.)

      B005XD7C01
      *a Bus 2 *b Bus 4
      *c Sub Bus *d V Bus
      *e Location of Malfunction *f Background color is red

      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.

    7. If both of the sub bus main bus lines 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, MIR-L background color changes to red.)

      B005YJVC01
      *a Bus 2 *b Bus 4
      *c Sub Bus *d V Bus
      *e Location of Malfunction *f Background color is red

    8. 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.

      Details of Malfunction
      Short between CAN lines (CANH and CANL)
      Short between a CAN line (CANH or CANL) and +B
      Short between a CAN line (CANH or CANL) and ground
      Open in a CAN main bus line
      B005Y62C01
      *a When any of the following malfunctions occur on the bus 4 *b When any of the following malfunctions occur on a sub bus
      *c Background color is red *d Not displayed

      Tech Tips


      • When a malfunction occurs in the bus, almost all ECUs and sensors on the 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 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 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.

    9. If a communication error of all ECUs and sensors is indicated on the CAN Bus Check screen, a communication stop of the V bus (DLC3 - central gateway ECU (network gateway ECU)) is suspected.

      Open in both CAN branch lines in the V bus

      B005ZOTC01
      *a Bus 2 *b Bus 4
      *c Sub Bus *d V 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.

  4. 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.

    • DTCs will only be stored if the Check Procedure is performed when the system is currently malfunctioning.


    1. Hybrid Vehicle Control ECU / GTS Display "Hybrid Control"

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: Refer to Hybrid Control System Click here.

      • *2: Refer to Hybrid Battery System Click here.

      Hybrid Vehicle Control ECU / GTS Display "Hybrid Control"
      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 hybrid vehicle control ECU does not receive data from the ECM for 0.68 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the hybrid vehicle control ECU is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 1.68 seconds. HV system warning light turns on. DTC is stored until it is cleared using the GTS.
      U0110*1 Lost Communication with Drive Motor Control Module ''A''

      Either condition is met:


      1. The hybrid vehicle control ECU does not receive data from the MG ECU for 0.11 seconds or more.

      2. The hybrid vehicle control ECU does not send data to the MG ECU for 0.04 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 0.1 seconds or more.

      • The power source voltage of the hybrid vehicle control ECU is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 0.21 seconds. HV system warning light turns on. DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The hybrid vehicle control ECU does not receive data from the brake booster with master cylinder assembly (skid control ECU) for 2.34 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 2 seconds or more.

      • The power source voltage of the hybrid vehicle control ECU is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 4.34 seconds. HV system warning light turns on. DTC is stored until it is cleared using the GTS.
      U0140 Communication Error from Body ECU to HV ECU The hybrid vehicle control ECU does not receive data from the main body ECU (multiplex network body ECU) for 3.6 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the hybrid vehicle control ECU is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 4.6 seconds. HV system warning light turns on. DTC is stored until it is cleared using the GTS.
      U0151 Communication Error from Airbag ECU to HV ECU The hybrid vehicle control ECU does not receive data from the airbag ECU assembly for 10.6 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the hybrid vehicle control ECU is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 11.6 seconds. HV system warning light turns on. DTC is stored until it is cleared using the GTS.
      U0164 Communication Error from A/C ECU to HV ECU The hybrid vehicle control ECU does not receive data from the air conditioning amplifier assembly for 10.6 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the hybrid vehicle control ECU is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 11.6 seconds. - DTC is stored until it is cleared using the GTS.
      U029A*2 Lost Communication with Hybrid Battery Pack Sensor Module The hybrid vehicle control ECU does not receive data from the battery smart unit for 0.52 seconds or more. The power switch is on (IG) for 0.5 seconds or more. Turn the power switch on (IG) and wait at least 1.02 seconds. HV system warning light turns on. DTC is stored until it is cleared using the GTS.
      U0424*1 Invalid Data Received from HVAC Control Module The hybrid vehicle control ECU receives an abnormal operation value command from the air conditioning amplifier assembly for 3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the hybrid vehicle control ECU is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 4 seconds. - DTC is stored until it is cleared using the GTS.
      U1107 Lost Communication with Power Management Module The hybrid vehicle control ECU does not receive data from the certification ECU (smart key ECU assembly) for 3.6 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the hybrid vehicle control ECU is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 4.6 seconds. HV system warning light turns on. DTC is stored until it is cleared using the GTS.

    2. ECM / GTS Display "Engine and ECT"

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      ECM / GTS Display "Engine and ECT"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0293 Lost Communication with HV ECU The ECM does not receive data from the hybrid vehicle control ECU for 0.576 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the ECM is 10.5 V or more.

      		 Turn the power switch on (IG) and wait at least 1.576 seconds. - DTC is stored until it is cleared using the GTS.

    3. Transmission Control ECU Assembly / GTS Display "Transmission Control"

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Transmission Control ECU Assembly / GTS Display "Transmission Control"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0146 Lost Communication with Body ECU The transmission control ECU assembly does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the transmission control ECU assembly is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 11 seconds. - DTC is stored until it is cleared using the GTS.

    4. Power Steering ECU Assembly / GTS Display "EMPS"

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Power Steering ECU Assembly / GTS Display "EMPS"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0129 Lost Communication with Brake System Control Module The power steering ECU assembly does not receive data from the brake booster with master cylinder assembly (skid control ECU) for 2.3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 2 seconds or more.

      • The power source voltage of the power steering ECU assembly is 9 V or more.

      		 Turn the power switch on (IG) and wait at least 4.3 seconds. EPS warning light illuminates. DTC remains stored only while malfunction is occurring.
      U023A Lost communication with forward recognition camera The power steering ECU assembly does not receive data from the forward recognition camera for 2 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 2 seconds or more.

      • The power source voltage of the power steering ECU assembly is 9 V or more.

      		 Turn the power switch on (IG) and wait at least 4 seconds. - DTC remains stored only while malfunction is occurring.
      U0293 Lost Communication with Hybrid Control Module The power steering ECU assembly does not receive data from the hybrid vehicle control ECU for 2.3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 2 seconds or more.

      • The power source voltage of the power steering ECU assembly is 9 V or more.

      		 Turn the power switch on (IG) and wait at least 4.3 seconds. EPS warning light illuminates. DTC remains stored only while malfunction is occurring.
      U1105 Lost Communication with Parking Assist ECU The power steering ECU assembly does not receive data from the parking assist ECU for 1.34 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 2 seconds or more.

      • The power source voltage of the power steering ECU assembly is 9 V or more.

      		 Turn the power switch on (IG) and wait at least 3.34 seconds. - DTC remains stored only while malfunction is occurring.

    5. Brake booster with master cylinder Assembly (Skid control ECU) / GTS Display "ABS/VSC/TRC"

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Brake booster with master cylinder Assembly (Skid control ECU) / GTS Display "ABS/VSC/TRC"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0073 Control Module Communication Bus OFF

      One of the following conditions is met:


      1. The brake booster with master cylinder assembly (skid control ECU) keeps sending data to an ECU or sensor for 5 seconds or more because a reception completion cannot be received.

      2. The airbag ECU assembly or spiral cable with sensor sub-assembly (steering angle sensor) and brake booster with master cylinder assembly (skid control ECU) cannot communicate for 1 second or more.

      3. The following condition occurs 10 times in succession within 60 seconds:

        - The airbag ECU assembly or spiral cable with sensor sub-assembly (steering angle sensor) cannot communicate with the brake booster with master cylinder assembly (skid control ECU) once or more within 5 seconds.

      4. The following condition occurs 10 times in succession:

        - The brake booster with master cylinder assembly (skid control ECU) cannot send/receive data (bus off) once or more within 0.1 seconds.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the brake booster with master cylinder assembly (skid control ECU) is between 10 and 17.4 V.

      		 Turn the power switch on (IG) and wait at least 60 seconds.

      • ABS warning light illuminates.

      • Brake warning light illuminates (yellow).

      • Slip warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0120 Lost Communication with Starter / Generator Control Module The brake booster with master cylinder assembly (skid control ECU) does not receive data from the certification ECU (smart key ECU assembly) for 3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the brake booster with master cylinder assembly (skid control ECU) is between 10 and 17.4 V.

      		 Turn the power switch on (IG) and wait at least 4 seconds. Brake warning light illuminates (yellow). DTC is stored until it is cleared using the GTS.
      U0123 Lost Communication with Yaw Rate Sensor Module

      Either condition is met:


      1. The brake booster with master cylinder assembly (skid control ECU) does not receive data from the airbag ECU assembly for 1 second or more.

      2. The following condition occurs 10 times in succession within 60 seconds:

        - The brake booster with master cylinder assembly (skid control ECU) does not receive data from the airbag ECU assembly once or more within 5 seconds.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the brake booster with master cylinder assembly (skid control ECU) is between 10 and 17.4 V.

      		 Turn the power switch on (IG) and wait at least 60 seconds.

      • ABS warning light illuminates.

      • Brake warning light illuminates (yellow).

      • Slip warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0124 Lost Communication with Lateral Acceleration Sensor Module

      Either condition is met:


      1. The brake booster with master cylinder assembly (skid control ECU) does not receive data from the airbag ECU assembly for 1 second or more.

      2. The following condition occurs 10 times in succession within 60 seconds:

        - The brake booster with master cylinder assembly (skid control ECU) does not receive data from the airbag ECU assembly once or more within 5 seconds.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the brake booster with master cylinder assembly (skid control ECU) is between 10 and 17.4 V.

      		 Turn the power switch on (IG) and wait at least 60 seconds.

      • ABS warning light illuminates.

      • Brake warning light illuminates (yellow).

      • Slip warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module

      Either condition is met:


      1. The brake booster with master cylinder assembly (skid control ECU) does not receive data from the spiral cable with sensor sub-assembly (steering angle sensor) for 1 second or more.

      2. The following condition occurs 10 times in succession within 60 seconds:

        - The brake booster with master cylinder assembly (skid control ECU) does not receive data from the spiral cable with sensor sub-assembly (steering angle sensor) once or more within 5 seconds.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the brake booster with master cylinder assembly (skid control ECU) is between 10 and 17.4 V.

      		 Turn the power switch on (IG) and wait at least 60 seconds. Slip warning light illuminates. DTC is stored until it is cleared using the GTS.
      U0293 Communication Error from HV ECU

      Either condition is met:


      1. The brake booster with master cylinder assembly (skid control ECU) does not receive data from the hybrid vehicle control ECU for 2 seconds or more.

      2. The following condition occurs 10 times in succession within 60 seconds:

        - With the IG2 terminal voltage of the brake booster with master cylinder assembly (skid control ECU) at 9.5 V or more, the brake booster with master cylinder assembly (skid control ECU) does not receive data from the hybrid vehicle control ECU once or more within 5 seconds.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the brake booster with master cylinder assembly (skid control ECU) is between 10 and 17.4 V.

      		 Turn the power switch on (IG) and wait at least 60 seconds.

      • Brake warning light illuminates (yellow).

      • Slip warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.

    6. Spiral Cable with Sensor Sub-assembly (Steering Angle Sensor) / GTS Display "-"

      Tech Tips

      The spiral cable with sensor sub-assembly (steering angle sensor) is connected to the CAN communication system, but the spiral cable with sensor sub-assembly (steering angle sensor) does not store or output CAN communication DTCs.

    7. Airbag ECU Assembly / GTS Display "SRS Airbag"

      Tech Tips

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

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

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Main Body ECU (Multiplex Network Body ECU) / GTS Display "Main Body"
      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 main body ECU (multiplex network body ECU) does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more have elapsed.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 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 transmission control ECU assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more have elapsed.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 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 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more have elapsed.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 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 booster with master cylinder assembly (skid control ECU) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more have elapsed.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 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 ECU assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more have elapsed.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster The main body ECU (multiplex network body ECU) does not receive data from the combination meter sub-assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more have elapsed.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0164 Lost Communication with HVAC Control Module The main body ECU (multiplex network body ECU) does not receive data from the air conditioning amplifier assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more have elapsed.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 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 5 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more have elapsed.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 15 seconds. - DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with Hybrid Powertrain Control Module The main body ECU (multiplex network body ECU) does not receive data from the hybrid vehicle control ECU for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more have elapsed.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.
      U0327 Software Incompatibility with Vehicle Security The main body ECU (multiplex network body ECU) does not receive data from the certification ECU (smart key ECU assembly) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more have elapsed.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 20 seconds. - DTC is stored until it is cleared using the GTS.

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

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Certification ECU (Smart Key ECU Assembly) / GTS Display "Power Source Control"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0103 Lost Communication with Gear Shift Module "A" The certification ECU (smart key ECU assembly) does not receive data from the transmission control ECU assembly for 5 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.
      U0129 Vehicle Speed Signal Communication The certification ECU (smart key ECU assembly) does not receive vehicle speed data from the brake booster with master cylinder assembly (skid control ECU) for 3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 3 seconds. - DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with Main Body ECU The certification ECU (smart key ECU assembly) does not receive data from the main body ECU (multiplex network body ECU) for 3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 3 seconds. - DTC is stored until it is cleared using the GTS.
      U0293 HV ECU Communication The certification ECU (smart key ECU assembly) does not receive data from the hybrid vehicle control ECU for 3.1 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 3.1 seconds. - DTC is stored until it is cleared using the GTS.

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

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Certification ECU (Smart Key ECU Assembly) / GTS Display "Entry&Start"
      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 certification ECU (smart key ECU assembly) does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 11 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 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 11 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 sub-assembly for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 11 seconds. - DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with HV ECU The certification ECU (smart key ECU assembly) does not receive data from the hybrid vehicle control ECU for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 11 seconds. - DTC is stored until it is cleared using the GTS.

    11. Air Conditioning Amplifier Assembly / GTS Display "Air Conditioner"

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Air Conditioning Amplifier Assembly / GTS Display "Air Conditioner"
      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 air conditioning amplifier assembly does not receive data from the ECM for 5 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the air conditioning amplifier assembly is 8.5 V or more.

      		 Turn the power switch on (IG) and wait at least 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 5 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the air conditioning amplifier assembly is 8.5 V or more.

      		 Turn the power switch on (IG) and wait at least 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 5 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the air conditioning amplifier assembly is 8.5 V or more.

      		 Turn the power switch on (IG) and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster Control Module (Combination Meter) The air conditioning amplifier assembly does not receive data from the combination meter sub-assembly for 5 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the air conditioning amplifier assembly is 8.5 V or more.

      		 Turn the power switch on (IG) and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with HV ECU The air conditioning amplifier assembly does not receive data from the hybrid vehicle control ECU for 5 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the air conditioning amplifier assembly is 8.5 V or more.

      		 Turn the power switch on (IG) and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.

    12. Combination Meter Sub-assembly / GTS Display "Combination Meter"

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Combination Meter Sub-assembly / GTS Display "Combination Meter"
      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 combination meter sub-assembly does not receive data from the hybrid vehicle control ECU for 2 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the combination meter sub-assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 2 seconds. - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Skid Control ECU The combination meter sub-assembly does not receive data from the brake booster with master cylinder assembly (skid control ECU) for 3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the combination meter sub-assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 3 seconds. - DTC is stored until it is cleared using the GTS.
      U0131 Lost Communication with Power Steering Control Module The combination meter sub-assembly does not receive data from the power steering ECU assembly for 3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the combination meter sub-assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 3 seconds. - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The combination meter sub-assembly does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the combination meter sub-assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 10 seconds. - DTC is stored until it is cleared using the GTS.
      U0151 Lost Communication with Airbag ECU The combination meter sub-assembly does not receive data from the airbag ECU assembly for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the combination meter sub-assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 10 seconds. - DTC is stored until it is cleared using the GTS.
      U0163 Lost Communication with Navigation Control Module The combination meter sub-assembly does not receive data from the navigation receiver assembly for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the combination meter sub-assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 10 seconds. - DTC is stored until it is cleared using the GTS.
      U023A Lost Communication with Front Camera Module The combination meter sub-assembly does not receive data from the forward recognition camera for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the combination meter sub-assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 10 seconds. - DTC is stored until it is cleared using the GTS.
      U1104 Lost Communication with Driving Support ECU The combination meter sub-assembly does not receive data from the driving support ECU assembly for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the combination meter sub-assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 10 seconds. - DTC is stored until it is cleared using the GTS.

    13. Navigation Receiver Assembly / GTS Display "Navigation System"

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Navigation Receiver Assembly / GTS Display "Navigation System"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0073 Sending Malfunction (Navigation to APGS) The navigation receiver assembly does not send/receive data for 5 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the navigation receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 6 seconds. - DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication with ECM / PCM "A" The navigation receiver assembly does not receive data from the ECM for 4 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the navigation receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The navigation receiver assembly does not receive data from the brake booster with master cylinder assembly (skid control ECU) for 1 second or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the navigation receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 2 seconds. - DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with Body Control Module The navigation receiver assembly does not receive data from the main body ECU (multiplex network body ECU) for 3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the navigation receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 4 seconds. - DTC is stored until it is cleared using the GTS.
      U0155 Meter ECU Communication The navigation receiver assembly does not receive data from the combination meter sub-assembly for 30 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the navigation receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 31 seconds. - DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with HV ECU The navigation receiver assembly does not receive data from the hybrid vehicle control ECU for 4 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the navigation receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.

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

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Radio and Display Receiver Assembly / GTS Display "Navigation System"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0073 Sending Malfunction (Navigation to APGS) The radio and display receiver assembly does not send/receive data for 5 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 6 seconds. - DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication with ECM / PCM "A" The radio and display receiver assembly does not receive data from the ECM for 4 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The radio and display receiver assembly does not receive data from the brake booster with master cylinder assembly (skid control ECU) for 1 second or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 2 seconds. - 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 3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 4 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 sub-assembly for 30 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 31 seconds. - DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with HV ECU The radio and display receiver assembly does not receive data from the hybrid vehicle control ECU for 4 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the radio and display receiver assembly is 9.5 V or more.

      		 Turn the power switch on (IG) and wait at least 5 seconds. - DTC is stored until it is cleared using the GTS.

    15. Hybrid Vehicle Control ECU / GTS Display "Radar Cruise1"

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Hybrid Vehicle Control ECU / GTS Display "Radar Cruise1"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0122 Lost Communication with Vehicle Dynamic Control Module The hybrid vehicle control ECU does not receive data from the brake booster with master cylinder assembly (skid control ECU) for 2.65 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The dynamic radar cruise control system is operating.

      		 Operate the dynamic radar cruise control system for 3.65 seconds or more. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with Hybrid Vehicle Control System The brake booster with master cylinder assembly (skid control ECU) does not receive data from the hybrid vehicle control ECU for 1 second or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The dynamic radar cruise control system is operating.

      		 Operate the dynamic radar cruise control system for 2 seconds or more. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U1104 Lost Communication with Driving Support ECU The hybrid vehicle control ECU does not receive data from the driving support ECU assembly for 0.92 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The dynamic radar cruise control system is operating.

      		 Operate the dynamic radar cruise control system for 1.92 seconds or more. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    16. Driving Support ECU Assembly / GTS Display "Radar Cruise2"

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: Refer to Dynamic Radar Cruise Control System.

        Click here

      Driving Support ECU Assembly / GTS Display "Radar Cruise2"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0125 Lost Communication with Yaw Rate Sensor Module The driving support ECU assembly does not receive data from the airbag ECU assembly for 0.72 seconds or more.

      All conditions are met:


      • The power switch is on (IG) for 3 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      • The dynamic radar cruise control system is operating.

      		 Operate the dynamic radar cruise control system for 3.72 seconds or more.

      • MIL illuminates.

      • 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 driving support ECU assembly does not receive data from the spiral cable with sensor sub-assembly (steering angle sensor) for 5.04 seconds or more.

      All conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      • The dynamic radar cruise control system is operating.

      		 Operate the dynamic radar cruise control system for 6.04 seconds or more.

      • MIL illuminates.

      • 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 driving support ECU assembly does not receive data from the brake booster with master cylinder assembly (skid control ECU) for 1.08 seconds or more.

      All conditions are met:


      • The power switch is on (IG) for 2 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      • The dynamic radar cruise control system is operating.

      		 Operate the dynamic radar cruise control system for 3.08 seconds or more.

      • MIL illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.
      U0235* Lost Communication with Cruise Control Front Distance Range Sensor The driving support ECU assembly does not receive data from the millimeter wave radar sensor assembly for 1.6 seconds or more.

      All conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      • The dynamic radar cruise control system is operating.

      		 Operate the dynamic radar cruise control system for 1.6 seconds or more.

      • MIL illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with Hybrid Vehicle Control System The driving support ECU assembly does not receive data from the hybrid vehicle control ECU for 0.92 seconds or more.

      All conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      • The dynamic radar cruise control system is operating.

      		 Operate the dynamic radar cruise control system for 1.92 seconds or more.

      • MIL illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.
      U1104* Lost Communication with Driving Support ECU The driving support ECU assembly does not receive data from the millimeter wave radar sensor assembly for 0.144 seconds or more.

      All conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      • The dynamic radar cruise control system is operating.

      		 Operate the dynamic radar cruise control system for 1.144 seconds or more.

      • MIL illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.

    17. Driving Support ECU Assembly / GTS Display "Pre-Crash2"

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: Refer to Pre-Crash Safety System.

        Click here

      Driving Support ECU Assembly / GTS Display "Pre-Crash2"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0125 Lost Communication with Yaw Rate Sensor Module The driving support ECU assembly does not receive data from the airbag ECU assembly for 0.036 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 3 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 3.036 seconds.

      • MIL illuminates.

      • PCS warning light illuminates.

      • 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 driving support ECU assembly does not receive data from the spiral cable with sensor sub-assembly (steering angle sensor) for 3.024 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 3 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 6.024 seconds.

      • MIL illuminates.

      • PCS warning light illuminates.

      • 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 driving support ECU assembly does not receive data from the brake booster with master cylinder assembly (skid control ECU) for 3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 3 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 6 seconds.

      • MIL illuminates.

      • PCS warning light illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.
      U0235* Lost Communication with Cruise Control Front Distance Range Sensor The driving support ECU assembly does not receive data from the millimeter wave radar sensor assembly for 0.3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 3 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 3.3 seconds.

      • MIL illuminates.

      • PCS warning light illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.
      U023A* Lost Communication with Front Camera Module The driving support ECU assembly does not receive data from the forward recognition camera for 3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 3 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 6 seconds.

      • MIL illuminates.

      • PCS warning light illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with HV ECU The driving support ECU assembly does not receive data from the hybrid vehicle control ECU for 3.072 seconds or more.

      All conditions are met:


      • The power switch is on (IG) for 3 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for at least 6.072 seconds.

      • MIL illuminates.

      • PCS warning light illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.
      U1002* Lost Communication with Gateway Module The driving support ECU assembly does not receive data from millimeter wave radar sensor assembly and forward recognition camera for 3 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 3 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 6 seconds.

      • MIL illuminates.

      • PCS warning light illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.
      U1104* Lost Communication with Driving Support ECU

      Either of the following conditions is met:


      • The millimeter wave radar sensor assembly and forward recognition camera do not receive data from the driving support ECU assembly for 0.224 seconds or more.

      • The brake booster with master cylinder assembly (skid control ECU) does not receive data from the driving support ECU assembly for 1.456 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 2 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 3.456 seconds.

      • MIL illuminates.

      • PCS warning light illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.

    18. Parking Assist ECU / GTS Display "IPA/Parking Assist Monitor"

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: If only U1000 is output, CAN communication is normal. Refer to Intelligent Parking Assist System Click here.

      Parking Assist ECU / GTS Display "IPA/Parking Assist Monitor"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0073 Control Module Communication Bus Off

      Either condition is met:


      1. The parking assist ECU keeps sending data to an ECU or a sensor for 1.24 seconds or more because a reception completion signal cannot be received.

      2. The parking assist ECU detects that it is disconnected from the bus (bus off) 10 times in succession.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the parking assist ECU is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 10 seconds. - DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication with ECM / PCM ''A'' The parking assist ECU does not receive data from the hybrid vehicle control ECU for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the parking assist ECU is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 11 seconds. - DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The parking assist ECU does not receive data from the spiral cable with sensor sub-assembly (steering angle sensor) for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the parking assist ECU is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 11 seconds. - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The parking assist ECU does not receive data from the brake booster with master cylinder assembly (skid control ECU) for 1.24 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the parking assist ECU is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 2.24 seconds. - DTC is stored until it is cleared using the GTS.
      U0131 Lost Communication with Power Steering Control Module The parking assist ECU does not receive data from the power steering ECU assembly for 1.4 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the parking assist ECU is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 2.4 seconds. - DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with Main Body ECU The parking assist ECU does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the parking assist ECU is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 11 seconds. - DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with HV ECU The parking assist ECU does not receive data from the hybrid vehicle control ECU for 2.34 seconds or more.

      Both conditions are met:


      • The power switch is on (IG) for 1 second or more.

      • The power source voltage of the parking assist ECU is 10 V or more.

      		 Turn the power switch on (IG) and wait at least 3.34 seconds. - DTC is stored until it is cleared using the GTS.
      U1000* Can Communication Failure (Message Registry) When the power switch is turned on (IG), a CAN communication malfunction is detected.

      Both conditions are met:


      • The power switch is on (IG).

      • The power source voltage of the parking assist ECU is 10 V or more.

      		 Turn the power switch on (IG). - DTC is stored until it is cleared using the GTS.

    19. Millimeter Wave Radar Sensor Assembly / GTS Display "-"

      Tech Tips

      The millimeter wave radar sensor assembly is connected to the CAN communication system, but CAN communication DTCs are not output.

    20. Forward Recognition Camera / GTS Display "LKA/LDA"

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: Refer to Lane Departure Alert System (w/ Steering Control).

        Click here

      Forward Recognition Camera / GTS Display "LKA/LDA"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0101 Lost Communication with TCM The forward recognition camera does not receive data from the hybrid vehicle control ECU for 5 seconds or more.

      All conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph or more.

      • Lane departure alert main switch is on.

      		 Turn the power switch on (IG), turn the lane departure alert system on using the lane departure alert main switch and drive the vehicle at a speed of 1 km/h or 1 mph or more for 7 seconds or more.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 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 ECU assembly for 5 seconds or more.

      All conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph or more.

      • Lane departure alert main switch is on.

      		 Turn the power switch on (IG), turn the lane departure alert system on using the lane departure alert main switch and drive the vehicle at a speed of 1 km/h or 1 mph or more for 7 seconds or more.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 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 spiral cable with sensor sub-assembly (steering angle sensor) for 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Lane departure alert main switch is on.

      		 Turn the power switch on (IG), turn the lane departure alert system on using the lane departure alert main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 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 booster with master cylinder assembly (skid control ECU) for 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Lane departure alert main switch is on.

      		 Turn the power switch on (IG), turn the lane departure alert system on using the lane departure alert main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 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 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Lane departure alert main switch is on.

      		 Turn the power switch on (IG), turn the lane departure alert system on using the lane departure alert main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 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 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Lane departure alert main switch is on.

      		 Turn the power switch on (IG), turn the lane departure alert system on using the lane departure alert main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Combination Meter The forward recognition camera does not receive data from the combination meter sub-assembly for 50 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Lane departure alert main switch is on.

      		 Turn the power switch on (IG), turn the lane departure alert system on using the lane departure alert main switch and wait at least 52 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0235* 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 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Lane departure alert main switch is on.

      		 Turn the power switch on (IG), turn the lane departure alert system on using the lane departure alert main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U023A* Lost Communication with Front Camera Module The power steering ECU assembly does not receive data from the forward recognition camera for 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Lane departure alert main switch is on.

      		 Turn the power switch on (IG), turn the lane departure alert system on using the lane departure alert main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with HV ECU The forward recognition camera does not receive data from the hybrid vehicle control ECU for 5 seconds or more.

      All conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph or more.

      • Lane departure alert main switch is on.

      		 Turn the power switch on (IG), turn the lane departure alert system on using the lane departure alert main switch and drive the vehicle at a speed of 1 km/h or 1 mph or more for 7 seconds or more.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U1104* Lost Communication with Driving Support ECU The forward recognition camera does not receive data from the driving support ECU assembly for 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Lane departure alert main switch is on.

      		 Turn the power switch on (IG), turn the lane departure alert system on using the lane departure alert main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.

    21. Forward Recognition Camera / GTS Display "Front Recognition Camera"

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: Refer to Forward Recognition Camera System.

        Click here

      Forward Recognition Camera / GTS Display "Front Recognition Camera"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0101 Lost Communication with TCM The forward recognition camera does not receive data from the hybrid vehicle control ECU for 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph or more.

      		 Drive the vehicle at a speed of 1 km/h or 1 mph or more for at least 7 seconds. 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 ECU assembly for 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph or more.

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

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 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 booster with master cylinder assembly (skid control ECU) for 5 seconds or more. The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more. Turn the power switch on (IG) and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 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 5 seconds or more. The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more. Turn the power switch on (IG) and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0235* 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 5 seconds or more. The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more. Turn the power switch on (IG) and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with HV ECU The forward recognition camera does not receive data from the hybrid vehicle control ECU for 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph or more.

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

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U1104* Lost Communication with Driving Support ECU The forward recognition camera does not receive data from the driving support ECU assembly for 5 seconds or more. The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more. Turn the power switch on (IG) and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.

    22. Forward Recognition Camera / GTS Display "Road Sign Assist"

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Forward Recognition Camera / GTS Display "Road Sign Assist"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0101 Lost Communication with TCM The forward recognition camera does not receive data from the hybrid vehicle control ECU for 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph or more.

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

      • MIL illuminates.

      • 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 ECU assembly for 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph or more.

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

      • MIL illuminates.

      • 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 booster with master cylinder assembly (skid control ECU) for 5 seconds or more. The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more. Turn the power switch on (IG) and wait at least 7 seconds.

      • MIL illuminates.

      • 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 5 seconds or more. The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more. Turn the power switch on (IG) and wait at least 7 seconds.

      • MIL illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Combination Meter The forward recognition camera does not receive data from the combination meter sub-assembly for 50 seconds or more. The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more. Turn the power switch on (IG) and wait at least 52 seconds.

      • MIL illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.
      U0293 Lost Communication with HV ECU The forward recognition camera does not receive data from the hybrid vehicle control ECU for 5 seconds or more.

      Both conditions are met:


      • The power source voltage of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph or more.

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

      • MIL illuminates.

      • Displays messages on the multi-information display.

      		 DTC is stored until it is cleared using the GTS.

    23. 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.

  5. CAN BUS WAVEFORMS

    B005YI6E08

    Tech Tips


    • The following 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.


    1. CAN bus waveforms (Group 1)


      1. B005ZGGE20
        *a 1 V/DIV.
        *b 50 μs./DIV.

        Normal waveform

      2. B005XCBE19
        *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.

      3. B005Z1PE20
        *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.

    2. 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.


      1. B005YWHE20
        *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.

      2. B005YOCE20
        *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.

      3. B005Y5LE20
        *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.

      4. B005XYXE20
        *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.

      5. B005XZ6E20
        *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.

  6. DATA SENDING/RECEIVING TABLE


    1. 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

      (Can be Checked in the Data List)

      Data Received by

      (Cannot be Checked in the Data List)

      		 Selected System Relevant Data List Item Link
      Accelerator position Hybrid vehicle control ECU -

      • Parking assist ECU

      • Navigation receiver assembly

      • Radio and display receiver assembly

      • Driving support ECU assembly

      • Forward recognition camera

      		 Hybrid Control Accelerator Degree

      Click here

      Engine speed ECM Hybrid vehicle control ECU

      • Airbag ECU assembly

      • Main body ECU (multiplex network body ECU)

      • Combination meter sub-assembly

      • Navigation receiver assembly

      • Radio and display receiver assembly

      		 Engine and ECT Engine Speed

      Click here

      Hybrid Control Engine Revolution

      Click here

      Engine coolant temp ECM Combination meter sub-assembly - Engine and ECT Coolant Temp

      Click here

      Combination Meter Coolant Temperature

      Click here

      Vehicle speed Brake booster with master cylinder assembly (skid control ECU)

      • Hybrid vehicle control ECU

      • Certification ECU (smart key ECU assembly)

      • Power steering ECU assembly

      • Driving support ECU assembly

      • Combination meter sub-assembly

      • Transmission control ECU assembly

      • Parking assist ECU

      • Forward recognition camera

      		 Hybrid Control Vehicle Spd

      Click here

      Power Source Control Vehicle Speed Signal

      Click here

      ABS/VSC/TRC Vehicle Speed

      Click here

      EMPS Meter Vehicle Velocity

      Click here

      Radar Cruise2 Vhcl Spd-Brake ECU

      Click here

      Combination Meter Vehicle Speed Meter

      Click here

      Vehicle speed Combination meter sub-assembly*3 -

      • Air conditioning amplifier assembly

      • Main body ECU (multiplex network body ECU)

      • Certification ECU (smart key ECU assembly)

      • Forward recognition camera

      		 Combination Meter Vehicle Speed Meter

      Click here

      Wheel speed Brake booster with master cylinder assembly (skid control ECU) -

      • Airbag ECU assembly

      • Hybrid vehicle control ECU

      • Power steering ECU assembly

      • Forward recognition camera

      • Driving support ECU assembly

      		 ABS/VSC/TRC

      • FR Wheel Speed

      • FL Wheel Speed

      • RR Wheel Speed

      • RL Wheel Speed

      Click here

      Park (P) state signal Transmission control ECU assembly Certification ECU (smart key ECU assembly) Combination meter sub-assembly*2 Power Source Control Shift P Signal Pulse

      Click here

      Transmission Control Shift Pos Display (P)

      Click here

      Ambient temperature Air conditioning amplifier assembly Parking assist ECU

      • Main body ECU (multiplex network body ECU)

      • Navigation receiver assembly

      • Radio and display receiver assembly

      • Driving support ECU assembly

      • Forward recognition camera

      		 IPA/Parking Assist Monitor

      • Temp Sensor Activate Status

      • Temp Sensor Status

      Click here

      Air Conditioner Ambient Temp Sensor

      Click here

      Steering angle sensor Spiral cable with sensor sub-assembly (Steering angle sensor)

      • Brake booster with master cylinder assembly (skid control ECU)

      • Power steering ECU assembly

      • Driving support ECU assembly

      • Hybrid vehicle control ECU

      • Parking assist ECU

      • Navigation receiver assembly

      • Radio and display receiver assembly

      • Forward recognition camera

      		 ABS/VSC/TRC Steering Angle Sensor

      Click here

      EMPS Steering Angle Velocity

      Click here

      Radar Cruise2 Steering Angle

      Click here

      Yaw rate sensor Airbag ECU assembly

      • Brake booster with master cylinder assembly (skid control ECU)

      • Driving support ECU assembly

      • Power steering ECU assembly

      • Forward recognition camera

      		 ABS/VSC/TRC

      • Yaw Rate Sensor

      • Yaw Rate Sensor2

      Click here

      Radar Cruise2 Yaw Rate Sensor

      Click here

      Deceleration sensor Airbag ECU assembly Brake booster with master cylinder assembly (skid control ECU)

      • Airbag ECU assembly

      • Hybrid vehicle control ECU

      • Power steering ECU assembly

      • Driving support ECU assembly

      • Forward recognition camera

      		 ABS/VSC/TRC

      • Deceleration Sensor

      • Deceleration Sensor2

      Click here

      Hybrid vehicle control ECU power supply condition*1 Hybrid vehicle control ECU - - Hybrid Control +B

      Click here

      Certification ECU (smart key ECU assembly) power supply condition*1 Certification ECU (smart key ECU assembly) - - Power Source Control Power Supply Condition

      Click here

      ECM power supply condition*1 ECM - - Engine and ECT Battery Voltage

      Click here

      Brake pedal stroke sensor*1 Brake booster with master cylinder assembly (skid control ECU) - - ABS/VSC/TRC

      • Stroke Sensor

      • Stroke Sensor2

      Click here

      Power steering ECU assembly power supply condition*1 Power steering ECU assembly - - EMPS IG Power Supply

      Click here

      Transmission control ECU assembly power supply condition*1 Transmission control ECU assembly - - Transmission Control IG (+B) Voltage Value

      Click here

      Parking assist ECU power supply condition*1 Parking assist ECU - - IPA/Parking Assist Monitor IG Voltage Low Status

      Click here

      Intensity of light received by the solar sensor*1 Air conditioning amplifier assembly - - Air Conditioner Solar Sensor (D Side)

      Click here

      Combination meter sub-assembly power supply condition*1 Combination meter sub-assembly - - Combination Meter +B Voltage Value

      Click here

      Driver door touch sensor*1 Certification ECU (smart key ECU assembly) - - Entry&Start D-Door Touch Sensor

      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.

      *3: The combination meter sub-assembly receives a vehicle speed signal from the brake actuator assembly (skid control ECU) and sends the signal to other ECUs.