| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. |
Circuit Description
Idle Air Control (IAC) valve is a rotary solenoid type and is located in front of air intake chamber. Intake air by-passing the throttle valve is directed to IAC valve through a passage. This allows air volume by-passing the throttle valve to be regulated. DTC P0505 is set if idle speed continues to vary greatly from target speed. Possible causes are
- IAC Valve Stuck Or Closed
- Open Or Short Circuit In IAC Valve Circuit
- Open Or Short Circuit In A/C Signal Circuit
- Air Intake Hose