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Positive Crankcase Ventilation (PCV) System

Purpose, outline

• Prevents release of blow-by gas (unburnt gas) into the atmosphere.

• The intake manifold vacuum introduces blow-by gas to the intake manifold via the PCV valve and the ventilation hose.

System diagram

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Structure

• The positive crankcase ventilation system consists of the following parts:

Positive Crankcase Ventilation (PCV) Valve

Purpose, function

• Prevents release of blow-by gas (unburnt gas) into the atmosphere.

• The PCV valve is open/closed by the intake manifold vacuum.

Construction

• The PCV valve is installed to the oil separator.

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• The PCV valve consists of a spring and valve.

SKYACTIV-G 2.0

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SKYACTIV-G 2.5

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Operation

• When the valve is pulled by the intake manifold vacuum, blow-by gas flows to the intake manifold.

SKYACTIV-G 2.0

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SKYACTIV-G 2.5

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• Blow-by gas flow amount is adjusted by the spring according to the intake manifold vacuum.