ECM Communication Circuit Malfunction

C1203 / 53 - ECM Communication Circuit Malfunction

DTC Detecting Condition:

CIRCUIT DESCRIPTION
This circuit is used to send TRAC & VSC control information from the skid control ECU to the ECM (TRC+, TRC-), and engine control information from the ECM to the skid control ECU (ENG+, ENG-).

Wiring Diagram:

Steps 1 - 4:

Steps 5 - 6:

INSPECTION PROCEDURE