DTC C1203: ECM Communication Circuit Malfunction: Procedure
- CHECK DTC (ENGINE CONTROL SYSTEM)
- Check if an engine control system DTC is output. Refer to DTC CHECK / CLEAR
.RESULT
Result Proceed to DTC is not output A DTC is output B
B → See step 3
A → See step 2
- Check if an engine control system DTC is output. Refer to DTC CHECK / CLEAR
.
- REPLACE ECM. Refer to REMOVAL
- GO TO ENGINE CONTROL (DIAGNOSTIC TROUBLE CODE CHART). Refer to DIAGNOSTIC TROUBLE CODE CHART