MIL Remains ON after Engine Starts: Troubleshooting

NOTE: When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the special tool to ECM and/or the ECM connectors referring to INSPECTION OF ECM AND ITS CIRCUITS .

DIAGNOSTIC INFORMATION AND PROCEDURES REFERENCE CHART

Step	Action	YES	NO
1	DTC check Start engine and recheck DTC of ECM and TCM while engine running. Refer to DTC CHECK . Is there any DTC(s)?	Go to Step 2 of ENGINE AND EMISSION CONTROL SYSTEM CHECK and Step 2 of CVT SYSTEM CHECK .	Go to Step 2.
2	CAN communication line circuit check Check CAN communication line circuit between control modules for open, short, high resistance and connections. Refer to TROUBLESHOOTING FOR CAN-DTC Is circuit in good condition?	Substitute a known-good combination meter and recheck DTC. Refer to DTC CHECK . If MIL still remains ON, substitute a known-good ECM and recheck DTC.	Repair or replace CAN communication circuit.