Impreza WRX Wagon F4-2.0L DOHC Turbo (2002)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
Idle Air Control Solenoid Valve
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The idle air control solenoid valve is located in the throttle body and regulates the amount of intake air that flows bypassing the throttle valve into
the intake manifold during engine idling. It is activated by a signal from the ECM in order to maintain the engine idling speed at a target speed.
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The idle air control solenoid valve is a solenoid-actuated rotary valve consisting of a coil, rotary valve, spring and housing. The housing is an
integral part of the throttle body and provided with a bypass air port whose opening area is changed by the rotary valve.