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DTC P0443: EVAP Purge Solenoid Circuit: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read DTCs and record related Freeze Frame data. Is the DTC Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  8.
  2. Turn the ignition off. Disconnect the EVAP Purge Solenoid harness connector. Check connector and clean/repair as necessary. Turn ignition on, engine not running. Using a 12-volt test light, jumper across the EVAP Purge Solenoid harness connector. With the DRBIII®, 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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
    NOTE: The EVAP Purge Solenoid Control circuit may also be referred to as EVAP Emission Solenoid Control circuit.
  3. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the EVAP Purge Solenoid Control circuit from the EVAP Purge Solenoid 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 in the EVAP Purge Solenoid Control circuit.
  4. Measure the resistance between ground and the 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 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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
    NOTE: The EVAP Purge Solenoid Sense circuit may also be referred to as EVAP Emission Solenoid Sense circuit.
  5. Measure the resistance of the EVAP Purge Solenoid Sense circuit from the EVAP Purge Solenoid 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 in the EVAP Purge Solenoid Sense circuit.
  6. Measure the resistance between ground and the EVAP Purge Solenoid Sense circuit at the EVAP Purge Solenoid harness connector. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the EVAP Purge Solenoid Sense circuit. If no, go to next step.
    7. NOTE: Before continuing, check the PCM harness connectors for corrosion, damage or terminal push out. Repair as necessary.
  7. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
  8. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. Perform a wiggle test of the EVAP Purge Solenoid wiring while the circuit is actuated with the DRBIII®. Listen for the solenoid to quit actuating. Also watch for the Good Trip Counter to change to 0. 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.
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