Idle Air Control Solenoid
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Idle Air Control (IAC) solenoid may also be referred to as IAC valve.
Idle Air Control (IAC) solenoid is a by-pass air type. Ensure ignition is off. Disconnect IAC solenoid harness connector. Measure resistance between IAC solenoid terminals. Solenoid has an internal diode and resistance will be infinite if voltmeter is hooked up incorrectly. If resistance is not 6-13 ohms, replace solenoid. If resistance is 6-13 ohms, IAC solenoid is okay. For additional testing and specifications, see TEST KE: IDLE AIR CONTROL VALVE under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.