Navistar MaxxForce 9

DIAGNOSTICMANUAL
Step
ActionDecision
7
DoOnboardFilterCleanlinessT est(OBFCT)toclearactive
aftertreatmentfaultcode(s).UsingElectronicServiceTool
(EST)withServiceMaxx™software,gotoT ests>KOER
AftertreatmentT ests>OnboardFilterCleanlinessT est.
WhileOBFCTisrunning,checkthefollowingcomponentsfor
exhaustleaks,andverifyallfasteners,brackets,andclamps
aresecureandundamaged:
•LowPressure(LP)turbochargeroutletpipe
•ExhaustBackPressureValve(EBPV)
•FlexiblemeshpipetoDOCinlet
•InlettoDOC
Wereallcomponentsfreeofexhaustleaks,andallfasteners,
brackets,andclampssecureandundamaged?
Yes:Gotostep8
No:Repairexhaustleakorrepair
failedfastener,bracket,orclamp.
Afterrepairsarecomplete,gotostep
8.
Step
ActionDecision
8
CheckforafailedAirManagementSystem(AMS)actuator.
1.UsingElectronicServiceTool(EST)with
ServiceMaxx™software,gotoT ests>LoadT est
SpecicSessionandverifyLoadT estSpecic
Sessionisunchecked.
2.GotoSessions>Performanceandselectthe
recordsnapshoticonfromthetoolbar.
3.GotoT ests>KOERT ests>AirManagement
Test.
WhenAirManagementT estiscomplete,stoprecording.
UsetheplaybackfeatureinServiceMaxx™,andgraphthe
followingsignalvalues:
SignalValues:
•EngineSpeed
•IntakeManifoldPressure(IMP)
•Turbocharger2WastegateControl(TC2WC)
DoessnapshotmatchGraph1orGraph2page120?
Graph1:Gotostep9A
Graph2:Diagnoseandrepair
failedactuator(SeePerformance
DiagnosticssectioninEngine
DiagnosticManual).Afterrepairsare
complete,retestfororiginalproblem.
93
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