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 (IAC) Valve Inspection
- Remove air cleaner outlet hose.
- Disconnect connector from IAC valve.
- Check for proper connection to IAC valve at each terminal.
- Check each coil of IAC valve for resistance. If resistances is out of specification, replace.
IAC valve resistance
Between terminals "1" and "2": 20 - 24 ohm at 20 °C (68° F)
Between terminals "3" and "2": 20 - 24 ohm at 20 °C (68° F)
Between terminals "4" and "5": 20 - 24 ohm at 20 °C (68° F)
Between terminals "6" and "5": 20 - 24 ohm at 20 °C (68° F)
- Remove IAC valve from throttle body referring to Idle Air Control (IAC) Valve Removal and Installation .
- Connect connector to IAC valve.
- Check that plunger (1) of IAC valve moves once and then stops as soon as ignition switch (2) is turned from ON position to OFF position.
If plunger (1) of IAC valve does not operate at all, check wire harnesses for open and short. If wire harnesses are in good condition, replace IAC valve and recheck.
NOTE: This check should be performed by two people, one person operates ignition switch while the other checks plunger operation.
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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.