Controlled Crankcase Ventilation (PCV) System (Honda Civic 6)

The PCV system serves to reduce emissions of hydrocarbon compounds into the atmosphere by removing crankcase gases. Blowing is carried out by circulating fresh air coming from the air cleaner through the crankcase, where it mixes with accumulated vapors and gases that have broken through from the combustion chambers and is discharged through the PCV valve into the intake manifold.

The main components of the system include the PCV valve, purge filter, and a set of vacuum hoses that connect these devices to the engine.

In order to maintain stable idle speed, the PCV valve closes the purge flow when there is a deep vacuum in the intake manifold. In the event of a malfunction of the engine (as, for example, in the case of problems with piston rings) the system removes excess crankcase gases through a ventilation tube into the air cleaner.

The procedures for checking and replacing the PCV valve are described in Chapter Routine maintenance.

[Based on materials from the website «HONDABOOK»]