ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1203/95

DTC Code DTC Name
C1203/95 ECM Communication Circuit Malfunction

DESCRIPTION

This circuit is used to send TRC and VSC information from the skid control ECU assembly to the power management control ECU, and hybrid control system information from the power management control ECU to the skid control ECU assembly via CAN communication.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1203/95 ECM Communication Circuit Malfunction - The information stored in the skid control ECU assembly is not correct.

  • Yaw rate and acceleration sensor zero point calibration undone

  • Brake pedal stroke sensor zero point calibration incomplete (Initialization and calibration of linear solenoid valve incomplete)

  • Power management control ECU

  • Skid control ECU assembly

 Electronically controlled brake system DTC

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU assembly, perform initialization and calibration of the linear solenoid valve.

Click here

PROCEDURE


  1. PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE


    1. Perform initialization and calibration of the linear solenoid valve.

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      ECB Utility
      Result
      Proceed to
      NEXT

    NEXT

  2. PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR


    1. Perform zero point calibration of the yaw rate and acceleration sensor.

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      Test Mode
      Result
      Proceed to
      NEXT

    NEXT

  3. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch off.

    4. Turn the power switch on (IG).

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1203/95 is output. A
      DTC C1203/95 is not output. B

    B

    END

    A

  4. CHECK PART NUMBER (SKID CONTROL ECU ASSEMBLY)


    1. Check that the proper skid control ECU assembly is installed.

      OK
      Proper skid control ECU assembly is installed.

    2. Check if the skid control ECU assembly was replaced before the DTC was recorded.

      OK
      The skid control ECU assembly was not replaced.
      Result
      Result Proceed to
      OK A
      NG (A proper skid control ECU assembly is not installed.) B
      NG (The skid control ECU assembly was replaced.) C

    B

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

    C

    CHECK INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE Click here

    A

  5. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (IG).

    4. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1203/95 is not output. A
      DTC C1203/95 is output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

  6. CHECK INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE


    1. After replacing the skid control ECU assembly, check that the initialization and calibration of the linear solenoid valve is being performed.

      OK
      Initialization and calibration of the linear solenoid valve is being performed.
      Result
      Proceed to
      OK
      NG

    NG

    PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE Click here

    OK

  7. CHECK ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR


    1. After replacing the skid control ECU assembly, check that the zero point calibration of the yaw rate and acceleration sensor is being performed.

      OK
      Zero point calibration of the yaw rate and acceleration sensor is being performed.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

    NG

    PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR Click here