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Circuit Description

Idle Air Control (IAC) valve is a step motor type and is located on air intake chamber. Intake air by-passing the throttle valve is directed to IAC valve through a hose. This allows air volume by-passing the throttle valve to be regulated. Code is set if idle speed continues to vary greatly from target speed. Possible causes are:

IAC valve stuck or closed.
Open or short circuit in IAC valve circuit.
Vacuum Switching Valve (VSV) for A/C idle-up.
Air intake hose.