Test B: Set Speed Fluctuates
- Check Speed Control Servo/Actuator Cable & Throttle Body Linkage - Ensure ignition is off. Disengage speed control servo/actuator cable from from servo/actuator. Inspect cable by pulling end of cable and observing throttle movement. If cable is okay, go to next step. Replace cable if broken or binding and retest system operation. Repair throttle body linkage if necessary, and retest system operation.
- Check Speedometer Operation - Drive vehicle and observe speedometer operation without using speed control. If speedometer needle fluctuates, see appropriate INSTRUMENT PANELS article to continue diagnosis. If speedometer needle does not fluctuate, replace speed control servo/actuator and retest system operation.