Dtc C1203 Ecm Communication Circuit Malfunction

Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131

DESCRIPTION

INSPECTION PROCEDURE

CHECK PART NUMBER (ECM AND BRAKE ACTUATOR ASSEMBLY)

CHECK PART NUMBER (MAIN BODY ECU AND BRAKE ACTUATOR ASSEMBLY)

CHECK BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)

RECONFIRM DTC

PERFORM INITIALIZATION AND CALIBRATION

RECONFIRM DTC

DTC C1203 ECM Communication Circuit Malfunction


DESCRIPTION

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

DTC No.
DTC Detection Condition
Trouble Area
C1203
Engine, drive source and destination variations that are sent from the ECM or main body ECU (multiplex network body ECU) do not match the ones of the skid control ECU (brake actuator assembly).
  1. ECM
  2. Main body ECU (Multiplex network body ECU)
  3. Skid control ECU (Brake actuator assembly)

INSPECTION PROCEDURE

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

  1. Check that the proper ECM is installed.

Result
Result
Proceed to
Proper ECM is installed
A
Proper ECM are not installed
B


B
REPLACE ECM (YARIS_NCP93 RM000001CN002IX.html)
A


2.CHECK PART NUMBER (MAIN BODY ECU AND BRAKE ACTUATOR ASSEMBLY)

  1. Check that the proper main body ECU (multiplex network body ECU) is installed.

    Result
    Result
    		Proceed to
    Proper ECU is installed
    		A
    Proper ECU is not installed
    		B



B
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (YARIS_NCP93 RM000003TOE00CX.html)
A


3.CHECK BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)

  1. Check if the skid control ECU (brake actuator assembly) had been replaced before the DTC was recorded.

    Result
    Result
    		Proceed to
    The brake actuator assembly is not replaced
    		A
    The brake actuator assembly is replaced
    		B



B
Go to step 5
A


4.RECONFIRM DTC

  1. Clear the DTC (YARIS_NCP93 RM000000XHV0D3X.html).

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0D3X.html).

Result
Result
Proceed to
DTC is not output
A
DTC is output
B


B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02KX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000XHS0AZX.html)

5.PERFORM INITIALIZATION AND CALIBRATION

  1. Perform initialization and calibration (YARIS_NCP93 RM000000XHR07EX.html).


NEXT


6.RECONFIRM DTC

  1. Clear the DTC (YARIS_NCP93 RM000000XHV0D3X.html).

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0D3X.html).

Result
Result
Proceed to
DTC is not output
A
DTC is output
B


B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02KX.html)
A

END