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DTC P0586: Speed Control Vent Solenoid Circuit: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read DTCs and record related Freeze Frame data. With the DRBIII®, actuate the Speed Control Vent Solenoid and note operation. Does the Speed Control Vent Solenoid actuate properly? If yes, go to next step. If no, go to step  3.
    2. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  2. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
  3. Turn the ignition off. Disconnect the Speed Control Servo harness connector. Ignition on, engine not running. With the DRBIII®, actuate the Speed Control Vent Solenoid. Using a 12-volt test light connected to ground, probe the Speed Control Vent Solenoid Control circuit. Does the test light illuminate brightly and flash? If yes, replace the Speed Control Servo. If no, go to next step.
    4. 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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  4. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the Speed Control Vent Solenoid Control circuit from the Speed Control Servo harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open/high resistance in the Speed Control Vent Solenoid Control circuit.
  5. Measure the resistance between ground and the Speed Control 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 Speed Control Vent Solenoid Control circuit. If no, go to next step.
    6. NOTE: Before continuing, check the PCM harness connectors for corrosion, damage or terminal push out. Repair as necessary.
  6. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
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