1. Check for continuity between ECM connector No. 1 terminal No. 80 and body ground.

Is there continuity?

YES | - | Repair short in the wire between the alternator and the ECM.■
NO | - | Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■

1. Turn the ignition switch OFF, and wait at least 30 seconds.

1. Disconnect ECM connector No. 1 (96P).