Test G: Speed Control Indicator Always On

NOTE: After completing any repairs, perform self-diagnostics. See SELF-DIAGNOSTIC SYSTEM .

NOTE: Perform all voltage and resistance tests using an Digital Volt-Ohm Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.

Turn ignition switch to LOCK position. Disconnect speed control servo/actuator 10-pin harness connector C122. See Figure. Speed control servo/actuator is located on left side of engine compartment. See Figure. Turn ignition switch to RUN position. If speed control indicator light illuminates, go to next step. If speed control indicator light does not illuminate, replace speed control servo/actuator. See SPEED CONTROL SERVO/ACTUATOR under REMOVAL & INSTALLATION.After repair, test system for normal operation.
Turn ignition switch to LOCK position. Disconnect instrument cluster 16-pin harness connector C220b, located behind instrument cluster. See Figure. Instrument cluster must be removed to access harness connector, see INSTRUMENT PANELS - ANALOG under REMOVAL & INSTALLATION in ANALOG INSTRUMENT PANELS - SABLE & TAURUS article. Measure resistance between ground and speed control servo/actuator connector C122 terminal No. 1 (Orange/Light Blue wire). See Figure. See WIRING DIAGRAMS . If resistance is greater than 10 k/ohms, replace instrument cluster printed circuit. See PRINTED CIRCUIT under REMOVAL & INSTALLATION in ANALOG INSTRUMENT PANELS - SABLE & TAURUS article. If resistance is less than 10 k/ohms, repair short circuit in Orange/Light Blue wire between instrument cluster and speed control servo/actuator. After repair, test system for normal operation.