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.
IAC Valve Operation
Remove IAC valve from throttle body. Connect battery positive lead to terminals B1 and B2 of IAC valve. See Fig 1. To close IAC valve pintle, repeatedly ground terminals S1, S2, S3 and S4 in sequence. To open IAC valve pintle, repeatedly ground terminals S4, S3, S2 and S1 in sequence. Replace IAC valve if pintle does not open and close as specified.
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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.