GENERAL INFORMATION
(CRANKCASE EMISSION CONTROL SYSTEM)
The crankcase emission control system prevents blow-by
gases from
escaping inside the crankcase into the atmosphere.
Fresh air is sent
from the air cleaner into the crankcase through the breather
hose.
The air becomes mixed with the blow-by gases inside the
crankcase.
The blow-by gas inside the crankcase is drawn into the
intake manifold through the positive
crankcase ventilation (PCV) valve.
The PCV valve lifts the plunger
according to the intake manifold vacuum so as to regulate
the flow of blow-by gas properly.
In other words, the blow-by gas
flow is regulated during low load engine operation to
maintain engine stability, while the flow is increased during high load
operation to improve
the ventilation performance.
SYSTEM DIAGRAM
![](../../../img/17/AK305788AB00ENG.png)