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Home >> Toyota >> 2003 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 103 (Engine Control System Self Diagnostics) >> Diagnostic Tests >> DTC P0505: Idle Air Control System & DTC P0511: Idle Air Control Circuit >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2003 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.

The rotary solenoid type IAC valve is located in front of the intake air chamber 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.

Engine Control Module (ECM) operates Idle Air Control (IAC) valve to perform idle-up and provide feedback for target idling speed.

ECM operates Idle Air Control (IAC) valve to perform idle-up and provide feedback for target idling speed.

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