VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1203

DTC Code DTC Name
C1203 ECM Communication Circuit Malfunction

DESCRIPTION

The circuit is used to send TRC/TRAC and VSC control information from the skid control ECU (brake actuator assembly) to the ECM, and engine control information from the ECM to the skid control ECU (brake actuator assembly) through the CAN communication system.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1203

ECM Communication Circuit Malfunction

Either of the following is detected:

  1. Engine model information sent from the ECM does not match the information stored in the skid control ECU.

  2. No system information stored in the skid control ECU.

  3. Incorrect installation of the skid control ECU or ECM.

  • ECM malfunction or ECM with incorrect part number installed

  • Skid control ECU (Brake actuator assembly)

CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration.

Click here

PROCEDURE

  1. CHECK PART NUMBER (ECM AND BRAKE ACTUATOR ASSEMBLY)

    1. Check that the proper ECM is installed.

    Result

    Proceed to

    Proper ECM is installed

    Proper ECM are not installed (for 2AD-FHV)

    Proper ECM are not installed (for 2AD-FTV)

    Proper ECM are not installed (for 2AR-FE)

    Proper ECM are not installed (for 3ZR-FAE)

    Proper ECM are not installed (for 3ZR-FE)

    Proper ECM are not installed (for 2WW)
    Proper ECM are not installed (for 2AD-FHV)

    REPLACE ECM

    Click here

    Proper ECM are not installed (for 2AD-FTV)

    REPLACE ECM

    Click here

    Proper ECM are not installed (for 2AR-FE)

    REPLACE ECM

    Click here

    Proper ECM are not installed (for 3ZR-FAE)

    REPLACE ECM

    Click here

    Proper ECM are not installed (for 3ZR-FE)

    REPLACE ECM

    Click here

    Proper ECM are not installed (for 2WW)

    REPLACE ECM

    Click here

    Proper ECM is installed

  2. CHECK BRAKE ACTUATOR ASSEMBLY

    1. Check if the brake actuator assembly had been replaced before the DTC was recorded.

    Result

    Proceed to

    The brake actuator assembly is not replaced

    The brake actuator assembly is replaced
    The brake actuator assembly is replaced

    PERFORM INITIALIZATION AND CALIBRATIONClick here

    The brake actuator assembly is not replaced

  3. RECONFIRM DTC

    1. Clear the DTC.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Check if the same DTC is recorded.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

    Result

    Proceed to

    DTC C1203 is not output

    DTC C1203 is output
    DTC C1203 is not output

    USE SIMULATION METHOD TO CHECK

    Click hereClick here

    DTC C1203 is output

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click hereClick here

  4. PERFORM INITIALIZATION AND CALIBRATION

    1. Perform initialization and calibration.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  5. RECONFIRM DTC

    1. Clear the DTC.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Check if the same DTC is recorded.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

    Result

    Proceed to

    DTC C1203 is not output

    DTC C1203 is output
    DTC C1203 is not output

    END

    DTC C1203 is output

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click hereClick here