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Test B: Set Speed Fluctuates

  1. Ensure problem does not occur while driving vehicle without speed control activated. If problem occurs only with speed control activated, go to next step. If problem occurs without speed control activated, repair engine performance problem as necessary.
    2. NOTE: Speed control servo/actuator cable must be disconnected at both ends while performing following test.
  2. 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. If problem does not exist, go to next step. If problem exists, repair as necessary.
  3. Install known good speed control servo/actuator. Test drive vehicle and check for proper speed control operation. If speed control operates properly, replace speed control servo/actuator. If speed control does not operate properly, replace Powertrain Control Module (PCM).
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