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
Turn ignition off. Disconnect Idle Air Control (IAC) valve 3-pin harness connector for Optima & Magentis (Canadian), Rio and Spectra, and 6-pin harness connector for Sedona and Sorento. For IAC valve location, see Figure-Figure . Check resistance between IAC valve terminals. For IAC valve terminal identification and resistance specification. See Fig 1 and Fig 2 . See IDLE AIR CONTROL VALVE RESISTANCES . If resistances are not as specified, replace IAC valve. For IAC valve removal and installation, see IDLE AIR CONTROL VALVE under AIR INDUCTION SYSTEM in REMOVAL & INSTALLATION article.
Use the Manual With the Right Hardware
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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.
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