Navistar MaxxForce 9 - Aftertreatment System Operation; Maxxforce; And 15

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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