Connect the IAC valve 3P connector terminal No. 3 and body ground with a jumper wire. IAC VALVE 3P CONNECTOR Wire side of female terminals Check for continuity between ECM/PCM connector terminal A12 and body ground. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the IAC valve and the ECM/PCM (A12). Reconnect the IAC valve 3P connector. Turn the ignition switch ON (II).

Measure voltage between body ground and ECM/PCM connector terminal A12. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there battery voltage? YES - Substitute a known-good ECM/PCM and recheck (see page 11-313). If symptom/indication goes away, replace the original ECM/PCM. NO - Replace the IAC valve.