Navistar MaxxForce 9 Diagnostic Manual

DIAGNOSTICMANUAL
9.3.SYMPTOM2(HEAVYDUTY):ENGINENOSTART/STARTSANDSTALLS
NOTE–Beforebeginningthefollowingstep-baseddiagnostics,performallvehicleoperationalchecks
page80.
Step
ActionDecision
1
Checkforanexhaustsystemrestrictionbyperformingthe
followingExhaustSystemRestrictionTest:
CAUTION
Topreventdamagetothestarter,ifengine
failstostartwithin20seconds,release
ignitionswitchandwait2to3minutesto
allowstartermotortocool.
1.TurnignitionswitchtoONposition.
2.UsingElectronicServiceTool(EST)with
ServiceMaxx™software,gotoSessions>
Performanceandselecttherecordsnapshoticon
fromthetoolbar.
3.Cranktheengineforamaximumof20seconds
andthenstoprecording.
4.UsetheplaybackfeatureinServiceMaxx™
andgraphTurbocharger1TurbineOutlet
Pressure(TC1TOP),andDieselParticulateFilter
DifferentialPressure(DPFDP)signalvalues.
5.VerifyDPFDPandTC1TOParewithin
specication.DPFDPsignalvalueshouldbeless
than1psi(7kPa),andTC1TOPsignalvalue
shouldbelessthan5psi(34kPa).
AreDPFDPandTC1TOPsignalvalueswithinspecication?
BothDPFDPandTC1TOPsignals
High:Gotostep2
TC1TOPsignalHighOnly:Gotostep
3
NeitherDPFDPorTC1TOPsignal
High:GotoHardStartandNo
StartDiagnosticssectioninEngine
DiagnosticManual.Afterrepairsare
complete,gotostep7.
Step
ActionDecision
2
DetermineifDieselParticulateFilter(DPF)iscontaminated.
RemovetheDPF(seeExhaustSystemServiceManual),and
checkforsignsoflubeoilandcoolantcontamination.
NOTE–Ablackstainingintheexhausttailpipecanoccur
onapplicationsthatexperiencehighidletimes.Thisis
normalandtheDPFshouldNOTbereplaced.
IstheDPFcontaminated?
Yes:RemovePre-DieselOxidation
Catalyst(PDOC)andDieselOxidation
Catalyst(DOC),andthengotostep4.
No:Gotostep5
91
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Navistar MaxxForce 9 Specifications

General

Brand	Navistar
Model	MaxxForce 9
Category	Engine
Language	English