Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Idle Air Control Valve
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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.