Dtc C1203 Ecm Communication Circuit Malfunction

Brake. Corolla. Zre142 Aze141
Brake Control Dynamic Control Systems. Corolla. Zre142 Aze141

DESCRIPTION

INSPECTION PROCEDURE

CHECK PART NUMBER (ECM AND BRAKE ACTUATOR ASSEMBLY)

DTC C1203 ECM Communication Circuit Malfunction


DESCRIPTION

The circuit is used to send TR(A)C and VSC control information from the skid control ECU to the ECM, and engine control information from the ECM to the skid control ECU through the CAN communication system.

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.
ECM

INSPECTION PROCEDURE

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

  1. Check that the proper ECM and brake actuator assembly (skid control ECU) are installed.

    OK:
    Proper ECUs are installed.

    Result:

    Result
    		Proceed to
    OK (for 2AZ-FE)
    		A
    OK (for 2ZR-FE)
    		B
    NG
    		C


B
REPLACE ECM (for 2ZR-FE) (COROLLA_ZRE142 RM000001CN0030X.html)

C
REPLACE ECUS WITH PROPER ONES
A

REPLACE ECM (for 2AZ-FE) (COROLLA_ZRE142 RM000002WT506MX.html)