T100 SR5 Extra Cab Pickup 4WD V6-3.4L (5VZ-FE) (1998)
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Idle Speed/Throttle Actuator - Electronic: Description and Operation
The rotary solenoid type IAC valve is located on the throttle body and intake air bypassing the throttle valve is directed to the IAC valve through a
passage.
In this way the intake air volume bypassing the throttle valve is regulated, controlling the engine speed.
The ECM operates only the IAC valve to perform idle-up and provide feedback for the target idling speed.