nissan Workshop Repair Guides

Nissan and Datsun Workshop Service and Repair Manuals

Sensors and Switches - Emission Control Systems > < Positive Crankcase Ventilation|Description and Operation
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Positive Crankcase Ventilation: Testing and Inspection

INSPECTION

PCV (Positive Crankcase Ventilation) Valve

With engine running at idle remove PCV valve ventilation hose from PCV valve; if the valve is working properly, a hissing noise will be heard as air
passes through it and a strong vacuum should be felt immediately when a finger is placed over valve inlet.

PCV Valve Ventilation Hose

1. Check hoses and hose connections for leaks.
2. Disconnect all hoses and clean with compressed air. If any hose cannot be freed of obstructions replace.

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