Idle Air Control Valve

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NOTE: IAC valve has a diode and resistance will be infinite if DVOM is hooked up wrong.

Idle Air Control (IAC) valve is by-pass air type. Ensure ignition is off. Disconnect IAC valve 2-pin harness connector. Measure resistance between IAC valve connector terminals. Connect DVOM positive lead to IAC valve connector VPWR terminal (Red wire on B-series truck, White/Red wire on Tribute) and negative lead to IAC terminal (Light Blue wire). Resistance should be 6-13 ohms. If resistance reading is not as specified, replace IAC valve. If resistance reading is 6-13 ohms, IAC valve is okay. For additional diagnostic testing and specifications, refer to appropriate SELF-DIAGNOSTICS article.