Navistar MaxxForce 9 Diagnostic Manual

DIAGNOSTICMANUAL
Step
ActionDecision
5
Determineifremovedaftertreatmentsystemcomponents
needtobecleanedseeDPFandDOCreuseguidelines
page159.
BasedonDPFandDOCRe-UseGuidelines,doanyof
theremovedaftertreatmentsystemcomponentsneedto
becleaned?
Yes:Cleancomponentsusing
appropriatecleaningequipment.After
cleaningprocedureiscomplete,install
componentsandgotostep7.
No:Installremovedaftertreatment
systemcomponents,andgotostep7.
Step
ActionDecision
6
Determinerootcauseofexhaustsystemcontamination.
(SeeEngineSymptomsDiagnosticssectioninEngine
DiagnosticManual.)
Afterrepairsarecomplete,gotostep8.
Step
ActionDecision
7
DieselParticulateFilter(DPF)SnapAccelerationTest
(QuickTest).ThisprocedurecheckstheDPFforcracks
orinternaldamagewithoutremovingtheDPFfromthe
vehicleandisusedtotestbasicfunctionalityoftheDPF.
ThisistobedonepriortoremovingtheDPF.
1.Thetransmissionmustbeinneutralandthe
parkingbrakeapplied.
2.Startandidletheengine.
3.Rapidlysnaptheacceleratorpedalfromidle
tofullthrottle.Thiscanbeperformedmultiple
times.
4.Duringtheengineaccelerations,visually
checkforaheavyblacksmokeexitingthe
exhaustpipe.
Isblacksmokevisible?
Yes:Gotosymptom5(HeavyDuty):
Blacksmokepage113.
No:Gotostep8
105
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Navistar MaxxForce 9 Specifications

General

Brand	Navistar
Model	MaxxForce 9
Category	Engine
Language	English