DTC C1203/53 ECM Communication Circuit Malfunction: Description

A new skid control ECU is supplied without engine variation data. Until it is recognized by the ECU, DTC C1203/53 remains stored. By entering test mode, recognition of engine variation data is automatically conducted, and DTC C1203/53 is cleared automatically.

DTC DETECTION CONDITION CHART

DTC Code	DTC Detection Condition	Trouble Area
C1203/53	When all of following conditions detected: Engine variation data from ECM does not match one in skid control ECU non-volatile memory. DTC U0073/94 not detected. DTC U0100/65 not detected.	Test mode not performed VSC actuator (skid control ECU)