mazda Workshop Repair Guides

Mazda Workshop Service and Repair Manuals

Sensors and Switches - Emission Control Systems > < Positive Crankcase Ventilation Valve|Description and Operation
Page 1
background image

Positive Crankcase Ventilation Valve: Testing and Inspection

Inspection

1. Verify that the engine coolant temperature is below 20°C (68°F).
2. Start the engine and let it idle.

3. Disconnect the PCV valve along with the ventilation hose from the cylinder head cover.
4. Block the PCV valve opening.
5. Verify that vacuum is felt.

View: Positive Crankcase Ventilation Valve

6. Remove the PCV valve.
7. Blow through the valve from port A and verify that air comes out of port B.
8. Blow through the valve from port B and verify that no air comes out of port A.
9. Replace the PCV valve if not as specified.

Sensors and Switches - Emission Control Systems > < Positive Crankcase Ventilation Valve|Description and Operation