Navistar MaxxForce 9

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DIAGNOSTICMANUAL

AFTERTREATMENTSYSTEMOPERATION

11.1.MAXXFORCE

11,13AND15

TheAftertreatment(AFT)system,partofthelargerexhaustsystem,processesengineexhausttomeet

emissionrequirements.TheAFTsystemtrapsparticulatematter(soot)andpreventsitfromleavingthetailpipe.

TheAFTsystemperformsthefollowingfunctions:

•MonitorsexhaustgastemperaturesDieselOxidationCatalystInletT emperature(DOCIT),DieselOxidation

CatalystOutletT emperature(DOCOT),andDieselParticulateFilterOutletT emperature(DPFOT).

•MonitorsDieselParticulateFilterDifferentialPressure(DPFDP).

•Controlsengineoperatingparametersforemissioncontrolandfailurerecognition.

•CancelsregenerationoftheAFTsystemintheeventofcatalystorsensorfailure.

•CalculatesthelevelofashaccumulationintheDieselParticulateFilter(DPF).

•InitiatesregenerationoftheAFTsystemwhenDPFsootloadistoohighbyincreasingexhaustgas

temperatures.

•Maintainsvehicleandengineperformanceduringregeneration.

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