ISC Servo Motor
- Turn ignition switch to "OFF" position. Disconnect ISC servo connector. Check motor coil continuity between terminals No. 1 and 4. Resistance should read between 7 and 10 ohms. If resistance is zero ohms or abnormally large, open or short circuit exists in in motor coil. Replace ISC servo assembly.
- Make sure there is no continuity between terminals No. 1 or 4 and injection mixer body. If continuity exists, there is a short circuit in coil. Replace ISC servo assembly.