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DTC P0443: EVAP Purge Solenoid Circuit: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the EVAP purge solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jumper across the EVAP purge solenoid harness connector. With the DRBIII® scan tool, actuate the EVAP purge solenoid. Does the test light flash on and off? If yes, replace the EVAP purge solenoid. 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 EVAP purge solenoid harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K52) EVAP purge solenoid control circuit from the EVAP purge solenoid 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 in the (K52) EVAP purge solenoid control circuit.
  4. Turn the ignition off. Disconnect the EVAP purge solenoid harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K52) EVAP purge solenoid control circuit at the EVAP purge solenoid harness connector. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the (K52) EVAP purge solenoid control circuit. If no, go to next step.
    5. 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.
  5. Turn the ignition off. Disconnect the EVAP purge solenoid harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K108) EVAP purge solenoid return circuit from the EVAP purge solenoid 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 in the (K108) EVAP purge solenoid return circuit.
  6. Turn the ignition off. Disconnect the EVAP purge solenoid harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K108) EVAP purge solenoid return circuit at the EVAP purge solenoid harness connector. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the (K108) EVAP purge solenoid return circuit. If no, go to next step.
  7. 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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