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.
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HOMESERVICE MANUALSTOYOTA2005CELICA GT-S, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSSFI SYSTEMIDLE AIR CONTROL (IAC) VALVEINSPECTIONINSPECT IAC VALVE OPERATION
2005 Toyota Celica GT-S, Standard
Inspect IAC Valve Operation
2005 Toyota Celica GT-S, StandardSECTION Inspect IAC Valve Operation
- Check that the IAC valve is half opened.
- Connect the IAC valve connector to the IAC valve.
- Disconnect the ECT sensor connector from the ECT sensor.
- Turn the ignition switch ON.
- Check that the IAC valve moves.
HINT:
Repeat connecting and disconnecting of IAC valve connector several times and check the operation of the valve. If operation is not as specified, replace the IAC valve.
- Turn the ignition switch OFF.
- Connect the ECT sensor connector to the ECT sensor.
- Disconnect the IAC valve connector from the IAC valve.
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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.