ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1203/95

DTC Code DTC Name
C1203/95 ECM Communication Circuit Malfunction

DESCRIPTION

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

Identification information sent from other ECUs is stored when shipped from the factory and used as default values.

Note

DTC C1203/95 is output when an incorrect ECU is installed. If initialization is performed and learning occurs with an incorrect ECU installed, operations and functions will differ from that stored when the vehicle was shipped from the factory. Therefore, make sure that learning occurs properly.

DTC Code INF Code DTC Detection Condition Trouble Area
C1203/95 -

Either of the following is detected:


  1. Identification information sent from other ECUs does not match with the value stored when shipped from the factory.

  2. No stored information for destination.

  • The wrong ECU and sensor was installed

  • Brake booster with master cylinder (Skid control ECU)

INSPECTION PROCEDURE

Note

When replacing the brake booster with master cylinder (skid control ECU), perform initialization, calibration of the linear solenoid valve and emergency brake signal learning Click here.

PROCEDURE


  1. CHECK PART NUMBER


    1. Check that a proper power management control ECU, main body ECU and yaw rate and acceleration sensor are installed.

      OK
      Proper ECUs and sensor are installed.

    2. Check if the power management control ECU, main body ECU and yaw rate and acceleration sensor had been replaced before the DTC was recorded.

      OK
      ECU and sensor had not been replaced.
      Result
      Result Proceed to
      OK A
      NG (A proper power management control ECU is not installed and/or the power management control ECU had been replaced) B
      NG (A proper main body ECU is not installed and/or the main body ECU had been replaced) C
      NG (A proper yaw rate and acceleration sensor is not installed and/or the yaw rate and acceleration sensor had been replaced) D

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) Click here

    D

    REPLACE YAW RATE AND ACCELERATION SENSOR Click here

    A

  2. PERFORM INITIALIZATION, CALIBRATION OF LINEAR SOLENOID VALVE AND EMERGENCY BRAKE SIGNAL LEARNING


    1. Perform initialization, calibration of the linear solenoid valve and emergency brake signal learning Click here.

      Tech Tips

      Before carrying out Perform Initialization and Calibration of Linear Solenoid Valve, C1203/95 will be output.


    NEXT

  3. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs Click here.

    3. Turn the power switch on (IG).

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

      Result
      Result Proceed to
      DTC (C1203/95) is output (for LHD) A
      DTC (C1203/95) is output (for RHD) B
      DTC (C1203/95) is not output C

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    C

    END

    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here