Test B: Set Speed Fluctuates
- Turn ignition switch to LOCK position. Perform a visual inspection by checking for binding or sticking cruise control servo/actuator cable, throttle linkage and/or throttle plate. Ensure throttle cable bracket and cruise control servo/actuator bracket are not loose. If all components are okay, go to next step. If a fault is found, repair or replace component as necessary. After repair, test system for normal operation.
- Test drive vehicle and observe speedometer operation. If speedometer operates properly, replace cruise control servo/actuator. See SERVO/ACTUATOR ASSEMBLY under REMOVAL & INSTALLATION. If speedometer does not operate properly, repair speedometer as necessary. See INSTRUMENT CLUSTER - CONVENTIONAL - CROWN VICTORIA & GRAND MARQUIS or INSTRUMENT CLUSTER - ELECTRONIC - CROWN VICTORIA & GRAND MARQUIS article. After repair, clear DTC and test system for normal operation.