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 (brake booster with master cylinder assembly) to the hybrid vehicle control ECU, and hybrid control system information from the hybrid vehicle control ECU to the skid control ECU (brake booster with master cylinder assembly) via CAN communication.

Identification information sent from other ECUs is stored when the vehicle is shipped from the factory and used as the 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 those stored when the vehicle was shipped from the factory. Therefore, make sure that learning occurs properly.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1203/95

ECM Communication Circuit Malfunction

-

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 or sensor was installed

  • Skid control ECU (Brake booster with master cylinder assembly)

Electronically controlled brake system DTC

CAUTION / NOTICE / HINT

Note:

  • When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

    Click here

  • When replacing the yaw rate and acceleration sensor (airbag ECU assembly), perform zero point calibration.

    Click here

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE

  1. CHECK PART NUMBER

    1. Check that the proper hybrid vehicle control ECU, main body ECU (multiplex network body ECU) and yaw rate and acceleration sensor (airbag ECU assembly) are installed.

      OK

      Proper ECUs and sensor are installed.

    2. Check if the hybrid vehicle control ECU, main body ECU (multiplex network body ECU) and yaw rate and acceleration sensor (airbag ECU assembly) were replaced before the DTC was recorded.

      OK

      ECU or sensor was not replaced.

    Result

    Result

    Proceed to

    OK

    A

    NG (A proper hybrid vehicle control ECU is not installed and/or the hybrid vehicle control ECU was replaced.)

    B

    NG (A proper main body ECU (multiplex network body ECU) is not installed and/or the main body ECU (multiplex network body ECU) was replaced.)

    C

    NG (A proper yaw rate and acceleration sensor (airbag ECU assembly) is not installed and/or the yaw rate and acceleration sensor (airbag ECU assembly) was replaced.)

    D
    B

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY

    Click here

    C

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    for LHD:Click here

    for RHD:Click here

    D

    REPLACE AIRBAG ECU ASSEMBLY

    Click here

    A

  2. 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
      Tip:

      Before performing initialization and calibration of the linear solenoid valve, DTC C1203/95 will be output.

    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
    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    B

    END