Idle Speed Control (ISC) Solenoid
- Solenoid is by-pass air type solenoid. Faults in ISC solenoid or circuit should set a service code. See QUICK TEST in TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section. If service code has not been set, turn ignition off.
- Disconnect ISC solenoid harness connector. Measure resistance between ISC solenoid terminals. Connect DVOM positive test lead to terminal VPWR and DVOM negative lead to terminal ISC. See Fig 1 .
- Resistance should be 7-13 ohms. If resistance is not within specification, replace solenoid. If resistance is within specification, see CIRCUIT TEST KE in TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section for circuit testing.