Circuit Description
WARNING: This page is about a different car, the 2000 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
ECM operates IAC valve to perform idle-up and provide feedback for target idling speed. DTC is set when idle speed continues to vary greatly from target speed. Possible causes are:
- Idle Air Control (IAC) valve is stuck, or remains closed.
- IAC valve circuit is open or shorted.
- A/C switch circuit is open or shorted.
- Leak in air intake.
- Defective ECM.