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DTC P0443: EVAP Purge Solenoid Circuit: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read DTCs. Is the DTC Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the EVAP Purge Solenoid connector. Check connector and clean/repair as necessary. Measure the resistance between the terminals of the EVAP Purge Solenoid (component side). Is the resistance between 29.0 and 44.0 ohms? If yes, go to next step. If no, replace the EVAP Purge Solenoid.
  3. Turn ignition on, engine not running. Measure the voltage of the (F12) Fused Ignition Switch Output circuit at the EVAP Purge Solenoid harness connector. Is the voltage above 10.0 volts? If yes, go to next step. If no, repair the Fused Ignition Switch Output circuit for an open or short to ground. Inspect the related fuse and repair as necessary.
  4. Turn the ignition off. Disconnect the PCM harness connectors. Check connectors and clean/repair as necessary. Measure the resistance of the (K52) EVAP Purge Solenoid control circuit from the PCM harness connector to the EVAP Purge Solenoid harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the EVAP Purge Solenoid control circuit for an open.
  5. Measure the resistance between ground and the EVAP Purge Solenoid Control circuit. Is the resistance below 100 ohms? If yes, repair the (K52) EVAP Purge Solenoid control circuit for a short to ground. If no, go to next step.
    6. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
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