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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 .
DTC TROUBLESHOOTING PROCEDURES

Step Action YES NO
1 DTC check 
  1. Start engine and recheck DTC of ECM and TCM while engine running.

    Is there any DTC(s)? 

 Go to Step 2 of ENGINE AND EMISSION CONTROL SYSTEM CHECK , Step 2 of A/T SYSTEM CHECK . Go to Step 2.
2 CAN communication line circuit check 
  1. Check CAN communication line circuit between control modules for open, short, high resistance and connections referring to Step 5 to 10 under TROUBLESHOOTING FOR COMMUNICATION ERROR WITH SCAN TOOL USING CAN .

    Is circuit in good condition? 

 Substitute a known-good combination meter and recheck. If MIL still remains ON, substitute a known-good ECM and recheck. Repair or replace CAN communication circuit.
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