Navistar MaxxForce 9 Diagnostic Manual

DIAGNOSTICMANUAL
Step
ActionDecision
3
PerformOnboardFilterCleanlinessT est(OBFCT)toclearactive
aftertreatmentfaultcode(s).UsingElectronicServiceT ool(EST)
withServiceMaxx™software,gotoT ests>KOERAftertreatment
Tests>OnboardFilterCleanlinessT est.Whiletestisrunning,
checkthefollowingcomponentsforexhaustleaksandverifyall
fasteners,bracketsandclampsaresecureandundamaged.
1.LowPressure(LP)turbochargeroutletpipe
2.ExhaustBackPressureValve(EBPV)
3.FlexibleMeshpipetoDieselOxidationCatalyst
(DOC)Inlet
4.InlettotheDOC
Areallcomponentsfreeofexhaustleaksandallfasteners,
bracketsandclampssecureandundamaged?
Yes:Repaircomplete
No:Repairanyleaks,damage,
andlooseparts.Endof
diagnostics.
Step
ActionDecision
4
CheckforaFailedAirManagementSystem(AMS)actuator.
1.UsinganElectronicServiceT ool(EST)with
ServiceMaxx™software,gotoT ests>LoadTest
SpecicSessionandverifyLoadT estSpecic
Sessionisunchecked.
2.GotoSessions>Performanceandselecttherecord
snapshoticonfromthetoolbar.
3.GotoT ests>KOERTests>AirManagementT est.
WhenairmanagementTestiscomplete,
stoprecording.Usetheplaybackfeaturein
ServiceMaxx™andgraphthefollowingsignalvalues.
SignalValues:
•MassAirFlow(MAF)meanvalue
•IntakeManifoldPressure(IMP)
•ExhaustGasRecirculation(EGR)Valveposition
DoessnapshotmatchGraph1orGraph2page51?
Graph1:Gotostep5A
Graph2:Diagnoseandrepair
failedactuator(SeePerformance
DiagnosticssectioninEngine
DiagnosticManual).Afterrepairs
arecomplete,retestfororiginal
problem.
45
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Navistar MaxxForce 9 Specifications

General

Brand	Navistar
Model	MaxxForce 9
Category	Engine
Language	English