VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:U0073/94, U0100/65, U0123/62, U0126/63

DTC Code DTC Name
U0073/94 Control Module Communication Bus OFF
U0100/65 Lost Communication with ECM / PCM
U0123/62 Lost Communication with Yaw Rate Sensor Module
U0126/63 Lost Communication with Steering Angle Sensor Module

DESCRIPTION

The skid control ECU receives the signals from the ECM, steering angle sensor and yaw rate sensor via the CAN communication system.

DTC Code DTC Detection Condition Trouble Area
U0073/94

When any of the following is detected:


  1. With the IG1 terminal voltage at 10 V or higher, after the output of data from the skid control ECU is completed, the sending operation continues for 5 seconds or more.

  2. The bus OFF state occurs once or more within 100 ms 10 times in succession (sent signals cannot be received).

  3. With the IG1 terminal voltage 10 V or higher, a delay in receiving data from the yaw rate sensor and steering angle sensor continues for 1 second or more.

  4. With the IG1 terminal voltage 10 V or higher, the following occurs 10 times in succession.


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

 CAN communication system
U0100/65

When all conditions below are detected:


  1. IG1 terminal voltage is at 10 V or higher.

  2. The vehicle speed is 15 km/h (9 mph) or more.

  3. Data cannot be sent to or received from the ECM for 2 seconds or more.

CAN communication system

(Skid control ECU to ECM)
U0123/62

When either of the following is detected:


  1. With the IG1 terminal voltage at 10 V or higher, data from the yaw rate sensor cannot be received for 1 second or more.

  2. With the IG1 terminal voltage at 10 V or higher, the following occurs 10 times in succession within 60 seconds.


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

CAN communication system

(Skid control ECU to yaw rate sensor)
U0126/63

When either of the following is detected:


  1. With the IG1 terminal voltage at 10 V or higher, data from the steering angle sensor cannot be received for 1 second or more.

  2. With the IG1 terminal voltage at 10 V or higher, the following occurs 10 times in succession within 60 seconds.


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

CAN communication system

(Skid control ECU to steering angle sensor)

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the intelligent tester, check for any momentary interruption in the wire harnesses and connectors corresponding to the DTC Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      EFI Communication Open EFI communication open detection/ Error or Normal Normal -
      Yaw Rate Open Yaw rate sensor open detection/ Error or Normal Normal -
      Steering Open Steering angle sensor open detection/ Error or Normal Normal -
      Result
      Result Proceed to
      There is a constant open circuit. A
      There are no momentary interruptions. B
      There are momentary interruptions. C

      Tech Tips

      Perform the above inspection before removing the sensor and connector.


    B

    RECONFIRM DTC Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    A

  2. CHECK IF EACH SENSOR AND ECM CONNECTOR IS SECURELY CONNECTED


    1. Turn the ignition switch off.

    2. Check if each sensor and 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 ignition switch off.

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

      Tech Tips

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

      Result
      Result Proceed to
      DTC (CAN communication system DTC) is output. A
      DTC (ABS and/or VSC DTC) is output. B
      DTC is not output. C

    A

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) 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 ignition switch off.

    2. Repair or replace the harness or connector.

    3. Check that there is no momentary interruption between the skid control ECU and each sensor or the ECM Click here.


    NEXT

  5. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs Click here.

    3. Start the engine.

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

    5. Check that no CAN communication system DTC is output Click here.

      Tech Tips

      If ABS and VSC DTCs are output, record them.

      Result
      Result Proceed to
      DTC is output for the CAN communication system. A
      No CAN DTC is output (ABS and/or VSC DTC is output). B
      No CAN DTC is output (No ABS and/or VSC DTC is output). C

      Tech Tips

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


    A

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    B

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC Click here

    C

    END