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