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DTC P0586: Speed Control Vent Solenoid Circuit: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. With the DRBIII® scan tool, actuate the speed control vent solenoid and note operation. Does the speed control vent solenoid actutate properly? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  2. Turn the ignition off. Disconnect the speed control servo harness connector. Ignition on, engine not running. With the DRBIII® scan tool, actuate the speed control vent solenoid. Using a 12-volt test light connected to ground, probe the (V35) speed control vent solenoid control circuit in the speed control servo harness connector. Does the test light illuminate brightly and flash? If yes, replace the speed control servo. If no, go to next step.
    3. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  3. Turn the ignition off. Disconnect the S/C servo harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (V35) S/C vent solenoid control circuit from the speed control servo harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open/high resistance in the (V35) S/C vent solenoid control circuit.
  4. Turn the ignition off. Disconnect the S/C servo harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (V35) S/C vent solenoid control circuit at the speed control servo harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (V35) speed control vent solenoid control circuit. If no, go to next step.
  5. Before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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