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 hose. 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 and a Vacuum Switching Valve (VSV) for idle-up control is also added for models with air conditioning.
| Fig. 1: The Idle Air Control (IAC) valve is secured to
the side of the throttle body
|
