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Positive Crankcase Ventilation (PCV) Valve Inspection

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the intake manifold.
  2. Remove the PCV valve.
  3. Verify that there is no airflow when pressure is applied to port A.
    • If there is airflow, replace the PCV valve.
  4. Verify that there is airflow when vacuum is applied to port A.
    • If there is no airflow, replace the PCV valve.
    Fig 1: Identifying PCV Valve Ports
    G00973073Courtesy of MAZDA MOTORS CORP.
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