Positive Crankcase Ventilation (PCV) Valve Inspection

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Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZR 2.5] .)
Remove the intake manifold and the fuel distribute component as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
Remove the PCV valve and the oil separator as a single unit. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION .)
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 .)
Verify that there is airflow when vacuum is applied to port A.

Fig 1: PCV Port

Courtesy of MAZDA MOTORS CORP.