Navistar MaxxForce DT Diagnostic Manual page 78

DIAGNOSTIC MANUAL
Intake air flow: Filtered air enters the LP compressor, where it is compressed and directed to the LPCAC
(if equipped). Cooled LP air enters the HP compressor where it is further compressed and directed into the
HPCAC. Compressed air then travels through the ETV and the intake throttle duct. This system provides high
charge air pressure to improve engine performance and to help reduce emissions.
Exhaust gas flow: The HP turbocharger is connected directly to the exhaust manifold through the HP turbine
inlet. Exhaust gases exit the HP turbine outlet and are directed to the LP turbine inlet. The HP turbocharger is
equipped with a single wastegate, which is controlled by pneumatic actuator. When boost demand is low, the
wastegate is opened, allowing part of the exhaust gas flow to bypass the turbine.
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