Positive Crankcase Ventilation System: Notes
A blow-by gas reduction device prevents blow-by gas from being expelled into the atmosphere and is of closed type. A positive crankcase ventilation (PCV) valve is provided in the PCV hose from the cylinder head cover to the intake manifold. During low load driving, clean air is supplied to the crankcase by the intake air duct via the breather hose and cylinder head cover, and it mixes with the blowby gas in the crankcase. The blow-by gas in the crankcase is induced to the intake manifold through the cylinder head cover and PCV valve. During high load driving, blow-by gas in the crankcase is induced to the intake manifold through the cylinder head cover and PCV valve and at the same time also via the intake air duct and throttle body due to negative pressure in the air cleaner.