Navistar MaxxForce 13 - Page 78

DIAGNOSTICMANUAL
Intakeairow:FilteredairenterstheLPcompressor,whereitiscompressedanddirectedtotheLPCAC
(ifequipped).CooledLPairenterstheHPcompressorwhereitisfurthercompressedanddirectedintothe
HPCAC.CompressedairthentravelsthroughtheETVandtheintakethrottleduct.Thissystemprovideshigh
chargeairpressuretoimproveengineperformanceandtohelpreduceemissions.
Exhaustgasow:TheHPturbochargerisconnecteddirectlytotheexhaustmanifoldthroughtheHPturbine
inlet.ExhaustgasesexittheHPturbineoutletandaredirectedtotheLPturbineinlet.TheHPturbochargeris
equippedwithasinglewastegate,whichiscontrolledbypneumaticactuator.Whenboostdemandislow,the
wastegateisopened,allowingpartoftheexhaustgasowtobypasstheturbine.
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