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A I R M A N A G E M E N T S Y S T E M
System Flow
• Air enters the system through the
air filter where particles are
removed from the air. The air filter
has a filter minder on it to warn the
operator of a restricted air filter.
• After the air is filtered, the mass of
the air and temperature is
measured by the mass air flow
sensor (MAF).
• The filtered air is then directed past
the crankcase ventilation system
where crankcase vapors and fresh
air are mixed.
• After mixing with crankcase vapors
the fresh air mixture is drawn into
the turbocharger compressor where
it is compressed and sent to the
charge air cooler (CAC).
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• The CAC condenses the air by
cooling it then the air returns to the
engine through the intake manifold.
• There is a throttle body on the
intake manifold. The throttle body
may or may not have a throttle
plate. For 2003.25 the throttle plate
will not be active in the pcm
strategy
• The intake manifold directs the air
to the intake ports of the cylinder
heads.
• The burned air fuel mixture is
pushed out of the cylinder into the
exhaust manifold which collects the
exhaust gases and routes them to
the turbocharger turbine wheel.
• The exhaust up pipe, connected to
the passenger side exhaust
VGT
Control Valve
manifold has a passage that
connects it to the exhaust gas
recirculation (EGR) cooler.
• The exhaust gasses, cooled by the
EGR cooler are sent to the EGR
valve in the intake manifold.
• The EGR valve controls the flow of
exhaust gases into the intake
system where the gases are mixed
with intake air to reduce NOx
(Nitrogen Oxide) emissions and
noise.
• The hot and expanding exhaust
gases that are routed to the
turbocharger turbine, spin the
turbine wheel through flow and
expansion. The spinning turbine
wheel in turn spins the compressor
wheel via a common shaft.
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