Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » Structure and operation
Positive Crankcase Ventilation

Positive Crankcase Ventilation

This system returns blowby gas to the intake manifold.

The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blowby gas to the intake manifold.

During partial throttle operation of the engine, the intake manifold sucks the blowby gas through the PCV valve.

Normally, the capacity of the valve is sufficient to handle any blowby and a small amount of ventilating air.

The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air passes through the hose connecting air inlet tubes to rocker cover.

Under fullthrottle condition, the manifold vacuum is insufficient to draw the blowby flow through the valve.

The flow goes through the hose connection in the reverse direction.

On vehicles with an excessively high blowby, the valve does not meet the requirement. This is because some of the flow will go through the hose connection to the air inlet tubes under all conditions.

Positive Crankcase Ventilation

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