EMISSION CONTROL <MPI>
ENGINE AND EMISSION CONTROL
17-15
CRANKCASE EMISSION CONTROL
SYSTEM
GENERAL INFORMATION (CRANKCASE
EMISSION CONTROL SYSTEM)
M1173005000334
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
COMPONENT LOCATION (CRANKCASE
EMISSION CONTROL SYSTEM)
M1173007400242
AK204365
Air cleaner
Air
Ventilation hose
Breather hose
PCV valve
AB
AK204366AD
PCV valve
<4G63>
AK302826
PCV valve
<4G69>
AB