VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:U0073, U0100, U0124, U0126

DTC Code DTC Name
U0073 Control Module Communication Bus OFF
U0100 Lost Communication with ECM / PCM
U0124 Lost Communication with Lateral Acceleration Sensor Module
U0126 Lost Communication with Steering Angle Sensor Module

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the ECM, steering angle sensor and yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.

DTC No. DTC Detection Condition Trouble Area
U0073

Any of the following is detected:


  1. When the IG1 terminal voltage is between 10 and 17.4 V, after the output of data from the skid control ECU (brake actuator assembly) is completed, the signals cannot be sent for 5 seconds or more.

  2. A bus OFF state occurs once or more within 0.1 seconds, 10 times in succession. (Sent signals cannot be received.)

  3. When the IG1 terminal voltage is between 10 and 17.4 V, a delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor continues for 1 second or more.

  4. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession:


    • A delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor occurs more than once within 5 seconds.

 CAN communication system
U0100 The IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed is 15 km/h (9 mph) or more, data cannot be received from the ECM for 2 seconds or more.

  • CAN communication system

  • Skid control ECU (Brake actuator assembly)

  • ECM
U0124

Either of the following is detected:


  1. When the IG1 terminal voltage is between 10 and 17.4 V, data from the acceleration sensor cannot be received for 1 second or more.

  2. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession:


    • Data from the acceleration sensor cannot be received once or more within 5 seconds.

  • CAN communication system

  • Skid control ECU (Brake actuator assembly)

  • Yaw rate and acceleration sensor (Airbag sensor assembly)
U0126

Either of the following is detected:


  1. When the IG1 terminal voltage is between 10 and 17.4 V, data from the steering angle sensor cannot be received for 1 second or more.

  2. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession:


    • Data from the steering angle sensor cannot be received once or more within 5 seconds.

  • CAN communication system

  • Skid control ECU (Brake actuator assembly)

  • Steering angle sensor

WIRING DIAGRAM


  1. for LHD

    A01G51RE02

  2. for RHD

    A01G5NOE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the GTS, check for any momentary interruption in the wire harness and connector corresponding to a DTC Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      EFI Communication Open ECM communication open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      Yaw Rate Open Yaw rate sensor open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      Steering Open Steering angle sensor open detection / Error or Normal

      Error: Momentary interruption

      Normal: Normal

      		 -
      Result
      Result Proceed to
      There is a constant interruption. (Error is displayed without interruption.) A
      There are no momentary interruptions. B
      There are momentary interruptions. (Error is displayed intermittently.) C

      Tech Tips

      Perform the above inspection before disconnecting any sensors or connectors.


    B

    RECONFIRM DTC Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    A

  2. CHECK IF EACH CONNECTOR IS SECURELY CONNECTED (ECM, SENSOR)


    1. Turn the engine switch off.

    2. Check if each sensor or ECM connector is securely connected.

      OK
      Each connector is securely connected.

    NG

    CONNECT CONNECTOR TO EACH SENSOR OR ECM CORRECTLY

    OK

  3. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Record the output DTCs (for VSC system and/or CAN communication system) Click here for VSC system, or Click here for CAN communication system).

      Tech Tips

      If CAN communication system DTCs and related sensor DTCs are output simultaneously, troubleshoot the DTCs (for VSC system) after the CAN communication system returns to normal.

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B
      CAN communication system DTCs are output. C

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  4. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Turn the engine switch off.

    2. Repair or replace the harness or connector.

    3. Check for any momentary interruptions between the skid control ECU (brake actuator assembly) and each sensor or ECM Click here.


    NEXT

  5. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off.

    4. Start the engine.

    5. Drive the vehicle at a speed of 15 km/h (9 mph) or more and turn the steering wheel to the right and left.

    6. Check that no CAN communication system DTCs are output Click here.

    7. If VSC system DTCs are output, record them Click here.

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B
      CAN communication system DTCs are output. C

      Tech Tips

      The CAN communication system must be normal when performing troubleshooting for sensor DTCs (for VSC system).


    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

    END