Check for continuity between ECM/PCM connector terminal E29 and body ground. ECM/PCM CONNECTOR E (31P) Wire side of female terminals Is there continuity? YES - Repair short in the wire between the service check connector and the ECM/PCM (E29). NO - Substitute a known-good ECM/PCM and recheck (see page 11-6). If symptom/indication goes away, replace the original ECM/PCM. Turn the ignition switch OFF. Disconnect ECM/PCM connector E (31P). Turn the ignition switch ON (II). Is the MIL on? YES - Repair short in the wire between the gauge assembly and the ECM/PCM (E31). If the wires are OK, replace the gauge assembly. NO - Substitute a known-good ECM/PCM and recheck (see page 11-6). If symptom/indication goes away, replace the original ECM/PCM.