DTC P0505: Idle Air Control (IAC) System Malfunction: Condition

DTC is set when engine idle speed is 100 RPM or more lower than predetermined for 20 seconds or more, continuously. DTC also is set when engine idle speed is 200 RPM or more higher than predetermined for 20 seconds or more, continuously. DTC is also set when IAC valve voltage is out of predetermined range for 20 seconds or more. MIL is illuminated when Power Control Module (PCM) detects malfunction during 2 consecutive drive cycles. Possible causes are:

• IAC valve malfunction.
• Air intake system plugged, leaking or fast idle control system malfunction.