All Mazda engines are equipped with the Positive Crankcase Ventilation (PCV) system. The PCV system vents crankcase gases into the engine air intake where they are burned with the fuel and air mixture. The PCV system keeps pollutants from being released into the atmosphere, and also helps to keep the engine oil clean, by ridding the crankcase of moisture and corrosive fumes. The PCV system consists of the rocker arm cover mounted PCV valve, the nipple in the air intake and the connecting hoses.
| Fig. 1: Typical PCV system schematic
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The PCV valve regulates the amount of ventilating air and blow-by gas to the intake manifold. It also prevents backfire from traveling into the crankcase, avoiding the explosion of crankcase gases.
