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Test B: Set Speed Fluctuates

  1. Turn ignition off. Disengage speed control servo/actuator cable 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.
  2. Drive vehicle and observe speedometer operation without using speed control. If speedometer needle fluctuates, repair speedometer as necessary. See appropriate ANALOG INSTRUMENT PANELS article. If speedometer needle does not fluctuate, replace speed control servo/actuator and retest system operation.