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

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

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0073

Control Module Communication Bus OFF

When any of the following is detected:

  1. The condition that the bus OFF state occurs once or more within 0.1 seconds occurs 10 times in succession while the voltage at the IG1 terminal is between 10 and 17.4 V. (Sent signals cannot be received.)

  2. When the IG1 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 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 sensor and steering angle sensor occurs more than once within 5 seconds.

CAN communication system

U0100

Lost Communication with ECM

When 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

U0124

Lost Communication with Lateral Acceleration Sensor Module

When either of the following is detected:

  1. When the IG1 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 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

U0126

Lost Communication with Steering Angle Sensor Module

When 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

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

    Normal or Error

    Normal

    Error: Momentary interruption

    Yaw Rate Open

    Yaw rate sensor open detection

    Normal or Error

    Normal

    Error: Momentary interruption

    Deceleration Open

    Acceleration sensor open detection

    Normal or Error

    Normal

    Error: Momentary interruption

    Steering Open

    Steering angle sensor open detection

    Normal or Error

    Normal

    Error: Momentary interruption

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    EFI Communication Open

    Yaw Rate Open

    Deceleration Open

    Steering Open
    Tip:

    Perform the above inspection before removing the sensor and connector.

    Result

    Proceed to

    There is a constant open circuit

    There are no momentary interruptions

    There are momentary interruptions
    There are no momentary interruptions

    RECONFIRM DTCClick here

    There are momentary interruptions

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    There is a constant open circuit

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

    1. Turn the ignition switch off.

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

      OK

      Each connector is securely connected.

    Result

    Proceed to

    OK

    NG
    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 VSC system and/or CAN communication system).

      for VSC system:Click here

      for CAN communication system for LHD:Click hereClick hereClick here

      for CAN communication system for RHD:Click hereClick hereClick here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Tip:

      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

      DTC (relating to CAN communication system) is output (for LHD)

      A

      DTC (relating to CAN communication system) is output (for RHD)

      B

      DTC (relating to VSC system) is output

      C

      DTC is not output

      D
    A

    CHECK CAN COMMUNICATION SYSTEM

    Click here

    B

    CHECK CAN COMMUNICATION SYSTEM

    Click here

    C

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC

    Click hereClick here

    D

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick here

  4. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Turn the ignition 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 or ECM.

      Click here

    4. Check that there is no momentary interruption.

    Result

    Proceed to

    NEXT
    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.

      for LHD:Click hereClick hereClick here

      for RHD:Click hereClick hereClick here

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

    Chassis > ABS/VSC/TRC > Clear DTCs

    Chassis > ABS/VSC/TRC > Trouble Codes

    Tip:

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

    Result

    Result

    Proceed to

    DTC is not output

    A

    DTC is output (relating to VSC system)

    B

    DTC is output (relating to CAN communication system) (for LHD)

    C

    DTC is output (relating to CAN communication system) (for RHD)

    D
    A

    END

    B

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC

    Click hereClick here

    C

    CHECK CAN COMMUNICATION SYSTEM

    Click here

    D

    CHECK CAN COMMUNICATION SYSTEM

    Click here