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. ■
Turn the ignition switch OFF, and wait at least 30 seconds. Disconnect ECM connector No. 1 (96P). |