P0507: Idle Air Control System Rpm Higher Than Expected (All Others)

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

P0507 - IDLE AIR CONTROL SYSTEM RPM HIGHER THAN EXPECTED (ALL OTHERS)

Description:	This DTC is set when the PCM detects an engine idle speed that is greater than the desired RPM.
Possible Causes:	IAC circuit shorted to ground. Damaged or incorrect IAC valve. IAC valve stuck open. Air intake leak after throttle body. Vacuum leaks. Failed EVAP system. Damaged PCM.
Diagnostic Aids:	Disconnect the IAC valve and look for little or no change in engine RPM as an indication of a stuck or damaged valve.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All others	GO to PINPOINT TEST KE: IDLE AIR CONTROL (IAC) VALVE Step 13.	GO to PINPOINT TEST KE: IDLE AIR CONTROL (IAC) VALVE Step 13.	GO to PINPOINT TEST KE: IDLE AIR CONTROL (IAC) VALVE Step 13.