Positive Crankcase Ventilation (PCV) Valve Inspection [L5]
WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the negative battery cable.
- Remove the intake manifold and the fuel distributor component as a single unit. See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5] .
- Remove the PCV valve and the oil separator as a single unit. See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L5] .
- Verify that there is no airflow when pressure is applied to port A.
- If there is airflow, replace the PCV valve. See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L5] .
- Verify that there is airflow when vacuum is applied to port A.
- If there is no airflow, replace the PCV valve. See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L5] .