Navistar MaxxForce 9

DIAGNOSTICMANUAL
Step
ActionDecision
13
RunDSISystemDe-AerationProceduretwice,topurge
theDownStreamInjection(DSI)systemofair.UsingEST,
gotoProcedures>KOERAftertreatmentProcedures>
DSISystemDe-Aeration.
Gotostep14
Step
ActionDecision
14
UsingEST,checkDiagnosticTroubleCode(DTC)listfor
faultcode(s)thatmayhavebecomeactiveduringOBFCT .
DoesDTClistcontainactivefaultcode(s)?
Yes:Repairactivefaultcode(s)(See
ElectronicControlSystemsDiagnostics
inEngineDiagnosticManual).After
repairsarecomplete,gotostep15.
No:Gotostep15
Step
ActionDecision
15
Verifyexhaustgastemperaturesarewithinspecication.
1.UsingElectronicServiceTool(EST)with
ServiceMaxx™software,gotoSessions>
Performanceandselecttherecordsnapshot
iconfromthetoolbar.
2.GotoTests>KOERAftertreatmentT ests>
OnboardFilterCleanlinessT est.
WhenOBFCTiscomplete,stoprecording.Usethe
playbackfeatureandgraphthefollowingsignalvalues
fromOBFCT:
SignalValues:
•DieselOxidationCatalystInletT emperature(DOCIT)
•DieselOxidationCatalystOutletT emperature(DOCOT)
•DieselParticulateFilterOutletT emperature(DPFOT)
•DPFSootLoad
ComparesnapshottoGraphs7and8page131.
Whichgraphdoessnapshotmostcloselymatch?
Graph7:Gotostep16
Graph8:ReplaceDOC.Afterrepairs
arecomplete,retestfororiginalproblem.
Step
ActionDecision
16
Verifyrootcauseoffrequentregenssymptom.
Hasrootcauseforfrequentregensbeendiagnosedand
repaired?
Yes:Diagnosticscomplete
No:Gobacktostep1ofEngineand
AftertreatmentSystemOperational
Checkspage80toverifyengine
systemsareinsatisfactorycondition.
103
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