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Home >> Chevrolet >> 1998 >> Prizm LSi, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Engine Controls - System/Component Tests >> Idle Air Control (IAC) Valve
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Idle Air Control (IAC) Valve

Idle Air Control (IAC) valve is located on bottom of throttle body. IAC valve opens and closes air by-pass passage according to signal from PCM. When open, air is supplied to intake manifold, which increases engine RPM for different engine loads. A malfunction in IAC valve circuit can set Diagnostic Trouble Code (DTC) P0505. For testing procedures, see TESTS W/CODES article.

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