Navistar MaxxForce 9 - Engine Systems Overview; Engine Identification

DIAGNOSTICMANUAL
3.3.SYMPTOM2(MEDIUMDUTY):ENGINENOSTART/STARTSANDSTALLS
NOTE–Beforebeginningthefollowingstep-baseddiagnostics,performallvehicleoperationalchecks
page5.
Step
ActionDecision
1
Checkforanexhaustsystemrestrictionbyperformingthefollowing
ExhaustSystemRestrictionT est:
CAUTION
Topreventdamagetothestarter,ifenginefailsto
startwithin20seconds,releaseignitionswitch,
andwait2to3minutestoallowstartermotorto
cool.
1.TurnignitionswitchtoONposition.
2.UsingESTwithServiceMaxx™software,goto
Sessions>PerformanceandrecordTurbocharger1
TurbineOutletPressure(TC1TOP)Key-OnEngine-Off
(KOEO)signalvalue.
3.Selecttherecordsnapshoticonfromthetoolbar.
4.Cranktheengineforamaximumof20seconds.If
enginedoesnotstart,wait2to3minutesandcrank
engineagainforamaximumof20seconds.
5.Stoprecording.
6.UsetheplaybackfeatureinServiceMaxx™andgraph
TC1TOP ,andDieselParticulateFilterDifferential
Pressure(DPFDP)signalvalues.
NOTE—TocalculateTC1TOP(actual),subtract
TC1TOPKOEOsignalvaluerecordedinstep2from
maximumTC1TOPsignalvaluereachedinstep7.
7.RecordmaximumTC1TOPsignalvaluereachedfrom
snapshot,andcalculateTC1TOPactual(SeeTable21,
page18).
8.VerifyDPFDPandTC1TOP(actual)arewithin
specication.DPFDPsignalvalueshouldbelessthan
1psi(7kPa),andTC1TOP(actual)shouldbelessthan
5psi(34kPa).
AreDPFDPandTC1TOPsignalvalueswithinspecication?
BothDPFDPandTC1TOP
signalsHigh:Gotostep2
TC1TOPsignalHighOnly:
Gotostep3
NeitherDPFDPor
TC1TOPsignalHigh:
GotoHardStartandNo
StartDiagnosticssection
inEngineDiagnostic
Manual.Afterrepairsare
complete,gotostep8.
17
https://www.truck-manuals.net/