Idle Air Control (IAC) Valve

Ensure ignition is off. Disconnect IAC valve connector. Connect an ohmmeter between connector terminals No. 1 (Blue/Black wire) and No. 2 (Blue/White wire), then between terminals No. 2 (Green wire) and No. 3 (Green wire). If resistance is not 9-14 ohms, replace IAC valve. If resistance is 9-14 ohms, IAC valve is okay. Check IAC circuits. See the TESTS W/CODES article.