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Test M: Set Speed Fluctuates

  1. Check That Condition Occurs Only While Using Speed Control  - Ensure engine is properly tuned. Ensure problem does not occur while driving vehicle without speed control activated. If problem occurs without speed control activated, repair engine as necessary. If problem occurs only with speed control activated, go to next step.
  2. Check For Binding In Speed Control Cable & Throttle Body Linkage  - Check for binding or sticking speed control servo/actuator cable, throttle linkage and/or throttle plate. Ensure throttle cable bracket and speed control servo/actuator bracket are not loose. Repair as necessary and perform SELF-DIAGNOSTIC TEST. If all components are okay, go to next step.
  3. Check Speedometer Operation  - Test drive vehicle and observe speedometer operation. If speedometer operates properly, replace speed control servo/actuator and perform SELF-DIAGNOSTIC TEST. If speedometer does not operate properly, see appropriate INSTRUMENT PANEL article to continue diagnosis.
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