Idle Speed Control (ISC) Solenoid
- Solenoid is by-pass air type solenoid. Ensure ignition is off. Disconnect ISC solenoid harness connector. Set DVOM to 200-ohm scale. Measure resistance between ISC solenoid terminals. See Fig 1. There is a diode in solenoid, connect DVOM (+) test lead to VPWR terminal and DVOM (-) lead to ISC terminal.
- Resistance should be 7-13 ohms. If resistance is not as specified, replace solenoid. Faults in ISC solenoid or circuit should set a service code. See Quick Test procedure in TESTS W/CODES
EEC-IV article. If no service code has been set, see CIRCUIT TEST KE in TESTS W/CODES
EEC-IV article for additional solenoid testing and specifications.
Courtesy of FORD MOTOR CO.