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VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:U0073, U0100, U0123, U0124, U0126

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DTC Code DTC Name
U0073 Control Module Communication Bus OFF
U0100 Lost Communication with ECM / PCM
U0123 Lost Communication with Yaw Rate Sensor Module
U0124 Lost Communication with Lateral Acceleration Sensor Module
U0126 Lost Communication with Steering Angle Sensor Module
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DESCRIPTION

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

DTC Code 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 is completed, the signals cannot be sent for 5 seconds or more.

  2. The condition that bus OFF state occurs once or more within 0.1 seconds occurs 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.


    • The condition that 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 to ECM)

U0123

Either of the following is detected:


  1. When the IG1 terminal voltage is between 10 and 17.4 V, data from the yaw rate 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.


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

CAN communication system

(Skid control ECU to yaw rate and acceleration sensor)

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.


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

CAN communication system

(Skid control ECU to yaw rate and acceleration sensor)

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.


    • 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 to steering angle sensor)

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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to the DTC (Click here).

      Table 1. ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      EFI Communication Open EFI 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 open circuit A
      There are no momentary interruptions B
      There are momentary interruptions C
      Tip:

      Perform the above inspection before removing the sensor and connector.


  2. Click here

    CHECK IF EACH SENSOR AND ECM CONNECTOR IS SECURELY CONNECTED


    1. Turn the engine switch off.

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

      OK
      Each connector is securely connected.

  3. Click here

    RECONFIRM DTC


    1. Turn the engine switch off.

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

      Tip:

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

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

  4. Click here

    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 and each sensor or ECM (Click here).

    4. Check that there are no momentary interruptions.


  5. Click here

    RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs (Click here).

    3. Start the engine.

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

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

    6. If ABS and/or VSC system DTCs are output, record them.

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

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


  6. Click here

    CHECK FOR INTERMITTENT PROBLEMSClick here

  7. Click here

    END

  8. Click here

    CONNECT CONNECTOR TO EACH SENSOR OR ECM CORRECTLY

  9. Click here

    REPAIR CIRCUIT INDICATED BY OUTPUT DTCClick here

  10. Click here

    INSPECT CAN COMMUNICATION SYSTEMClick here