Turn the ignition switch ON (II). At the engine wire harness side, measure voltage between the IAT sensor 2P connector terminal No. 2 and body ground. IAT SENSOR 2P CONNECTOR Wire side of female terminals Is there about 5 V? YES - Go to step 8. NO - Go to step 9. Measure voltage between the IAT sensor 2P connector terminals No. 1 and No. 2. IAT SENSOR 2P CONNECTOR Wire side of female terminals Is there about 5 V? YES - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM. NO - Repair open in the wire between the ECM/PCM (A10) and the IAT sensor.

Measure voltage between ECM/PCM connector terminals A10 and B17. ECM/PCM CONNECTORS Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (B17) and the IAT sensor. NO - Go to step 10. Turn the ignition switch OFF. Disconnect ECM/PCM connector B (24P). Check for continuity between ECM/PCM connector terminal B17 and body ground. ECM/PCM CONNECTOR B (24P) Wire side of female terminals Is there continuity? YES - Repair short in the wire between the ECM/PCM (B17) and the IAT sensor. NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.