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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. See appropriate SELF-DIAGNOSTIC article in ENGINE PERFORMANCE.
    2. NOTE: Speed control servo/actuator cable must be disconnected at both ends while performing following test. Speed control servo/actuator is located behind left front fenderwell.
  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. See REMOVAL & INSTALLATION  . Test drive vehicle and check for proper speed control operation. If speed control does not operate properly, go to next step. If speed control operates properly, replace speed control servo/actuator.
  4. Replace Powertrain Control Module (PCM). See REMOVAL & INSTALLATION  . PCM is located behind passenger's side kick panel. See Figure .
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