Idle Air Control Solenoid

Idle Air Control (IAC) solenoid is by-pass air type. Ensure ignition switch is off. Disconnect IAC solenoid harness connector. Measure resistance between IAC solenoid connector terminals. Solenoid has a diode and resistance will be infinite if voltmeter is hooked up wrong. Connect DVOM positive lead to IAC solenoid connector VPWR terminal (Red wire on B-series, White/Red wire on Tribute) and negative lead to IAC terminal (Light Blue wire). Resistance should be 6-13 ohms. If reading is not as specified, replace IAC solenoid. If resistance is 6-13 ohms, IAC solenoid is okay. See appropriate SELF-DIAGNOSTICS article for additional testing and specifications.