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Test B: Set Speed Fluctuates

  1. Test drive vehicle and observe speedometer for fluctuation without speed control engaged. If speedometer does not fluctuate, go to next step. If speedometer fluctuates, repair speed sensor. See appropriate INSTRUMENT PANELS article.
  2. Turn ignition switch to LOCK position. Disconnect speed control actuator 4-pin harness connector. Disconnect inlet port vacuum line from speed control vacuum canister. Inlet port is located underneath vacuum canister. Connect a 10-amp fused jumper wire between speed control actuator terminal No. 2 (component side) and positive battery terminal. Connect a second jumper wire between ground and speed control actuator terminals No. 1, 3, and 4 (component side). If speed control actuator pulls speed control actuator cable inward, go to next step. If speed control actuator does not pull speed control actuator cable inward, replace speed control actuator.
  3. Ensure jumper wires are still connected to speed control actuator. Remove jumper wire from speed control actuator terminal No. 3. If speed control actuator remains pulled in, go to next step. If speed control actuator does not remain pulled in, replace speed control actuator.
  4. With jumper wires connected to speed control actuator, remove jumper wire from terminal No. 2. If speed control actuator releases immediately, replace speed control actuator module. If speed control actuator does not release immediately, replace speed control actuator.
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