VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1203, C1270

DTC Code DTC Name
C1203 ECM Communication Circuit Malfunction
C1270 Initialization Incomplete (Test Mode DTC)

DESCRIPTION

The circuit is used to send TRC and VSC control information from the skid control ECU to the ECM, and engine control information from the ECM to the skid control ECU.

If the skid control ECU is replaced or if the memory is cleared, system information such as the destination or vehicle type will be unconfirmed. After switching to Test Mode, the skid control ECU performs initialization when starting communication with the vehicle, and stores the system information in 2 or 3 seconds.

DTC C1270 will be cleared when the initialization is completed normally or when Test Mode ends. DTC C1270 is output only in Test Mode.

DTC Code DTC Detection Condition Trouble Area
C1203 Engine, drive source and destination variations that are sent from the ECM do not match the ones of the skid control ECU or there is no information in the memory. ECM
C1270 Detected only during Test Mode.

  • ECM

  • CAN communication system (Skid control ECU to ECM)

  • Brake actuator assembly (Skid control ECU)

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform zero point calibration and store system information Click here.

PROCEDURE


  1. CHECK PART NUMBER (ECM)


    1. Check that the part number of the installed ECM is correct.

      OK
      ECM installed in the vehicle has the correct part number.
      Result
      Result Proceed to
      OK A
      NG (for 2GR-FE) B
      NG (for 1AR-FE) C

    B

    REPLACE ECM (for 2GR-FE) Click here

    C

    REPLACE ECM (for 1AR-FE) Click here

    A

  2. CLEAR AND STORE SYSTEM INFORMATION


    1. Clear the system information Click here.

    2. Store the system information Click here.


    NEXT

  3. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC (C1203) is not output A
      DTC (C1203) is output B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here