VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:U0073, U0100, U0124, U0126, U0128

DTC Code DTC Name
U0073 Control Module Communication Bus OFF
U0100 Lost Communication with ECM
U0124 Lost Communication with Lateral Acceleration Sensor Module
U0126 Lost Communication with Steering Angle Sensor Module
U0128 Lost Communication With EPB Module

DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area Note
U0073 Control Module Communication Bus OFF

Either of the following is detected:


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

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

  3. When the +BS terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession within 60 seconds.


    • The condition that a delay in receiving data from the yaw rate sensor and steering angle sensor occurs more than once within 5 seconds.

 CAN communication system -
U0100 Lost Communication with ECM When the +BS 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 Lost Communication with Lateral Acceleration Sensor Module

Either of the following is detected:


  1. When the +BS terminal voltage is between 10 and 17.4 V, and the vehicle speed is 7 km/h or more, data from the acceleration sensor cannot be received for 1 second or more.

  2. When the +BS terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession within 60 seconds.


    • The condition that data from the acceleration sensor cannot be received occurs once or more within 5 seconds.

  • CAN communication system

  • Skid control ECU (brake actuator assembly)

  • Acceleration sensor (yaw rate and acceleration sensor)

 -
U0126 Lost Communication with Steering Angle Sensor Module

Either of the following is detected:


  1. When the +BS 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 +BS terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession.


    • The condition that data from the steering angle sensor cannot be received occurs once or more within 5 seconds.

  • CAN communication system

  • Skid control ECU (brake actuator assembly)

  • Steering angle sensor

 -
U0128 Lost Communication With EPB Module When voltage at terminal +BS is 10 to 17.4 V, data cannot be received from parking brake ECU assembly continuously for 1 second or more.

  • CAN communication system

  • Skid control ECU (brake actuator assembly)

  • Parking brake ECU assembly

 EPB: Electric Parking Brake System

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


      Chassis > ABS/VSC/TRC > Data List
      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

      		 -
      Deceleration Open Acceleration 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

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      EFI Communication Open
      Yaw Rate Open
      Deceleration Open
      Steering Open

      Tech Tips

      Perform the above inspection before removing the sensor and connector.

      Result
      Result Proceed to
      There is a constant open circuit. A
      There are no momentary interruptions. B
      There are momentary interruptions. C

    B

    GO TO STEP 3 Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    A

  2. CHECK IF EACH CONNECTOR IS SECURELY CONNECTED (ECM, SENSOR, PARKING BRAKE ECU ASSEMBLY, AIRBAG ECU ASSEMBLY)


    1. Turn the engine switch off.

    2. Check if each sensor, ECM, parking brake ECU assembly and yaw rate and acceleration sensor (airbag ECU assembly) connector is securely connected.

      OK
      Each connector is securely connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTOR TO EACH SENSOR, ECM, PARKING BRAKE ECU ASSEMBLY AND AIRBAG ECU ASSEMBLY CORRECTLY

    OK

  3. RECONFIRM DTC


    1. Turn the engine switch off.

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

      for VSC system: Click here

      for CAN communication system (for LHD): Click here

      for CAN communication system (for RHD): Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      Tech Tips

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

      Result
      Result Proceed to
      DTCs (relating to CAN communication system) are output. A
      DTCs (relating to VSC system) are output. B
      DTCs are not output. C

    A

    CHECK CAN COMMUNICATION SYSTEM for LHD: Click here
    CHECK CAN COMMUNICATION SYSTEM for RHD: Click here

    B

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC Click here

    C

    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 interruption between the skid control ECU (brake actuator assembly) and each sensor, ECM, parking brake ECU assembly and yaw rate and acceleration sensor (airbag ECU assembly).

      Click here

    4. Check that there is no momentary interruption.

      Result
      Proceed to
      NEXT

    NEXT

  5. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    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 DTC is output.

      for LHD: Click here

      for RHD: Click here

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

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

      Tech Tips

      The CAN communication system must be normal when repairing each sensor DTC (for VSC system).

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output (relating to VSC system). B
      DTCs are output (relating to CAN communication system). C

    A

    END

    B

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC Click here

    C

    CHECK CAN COMMUNICATION SYSTEM for LHD: Click here
    CHECK CAN COMMUNICATION SYSTEM for RHD: Click here