POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [MZI-3.7]

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  Note
  • The PCV valve cannot be reassembled once it is removed because the tabs will have been broken. Inspect the PCV valve without removing it from the vehicle.

Airflow Inspection

1. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].)

2. Disconnect the PCV valve hose from the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [MZI-3.7].)

3. Verify that there is no airflow when pressure is applied to the PCV valve using a vacuum pump.

  • If there is airflow, replace the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [MZI-3.7].)

4. Verify that there is airflow when vacuum is applied to the PCV valve.

  • If there is no airflow, replace the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [MZI-3.7].)