Navistar MaxxForce 15 - Page 121

DIAGNOSTICMANUAL
Step
ActionDecision
5D
CheckforIntakeManifoldPressure(IMP)issue.Use
theplaybackfeatureinServiceMaxx™,andgraphthe
followingsignalvaluesfromLugDownTest:
SignalValues:
•EngineSpeed
•IntakeManifoldPressure(IMP)
•AcceleratorPedalPosition1(APP1)
•VehicleSpeed
ComparesnapshottoGraph5andassociatedGraph
Analysispage127.
IsIMPoperatingperGraph5GraphAnalysis?
Yes:Gotostep6
No:DiagnoseandrepairIMPissue
(SeePerformanceDiagnosticssectionin
EngineDiagnosticManual).Afterrepairs
arecomplete,retestfororiginalproblem.
Step
ActionDecision
6
Verifyexhaustgastemperaturesarewithinspecication.
1.UsingElectronicServiceT ool(EST)with
ServiceMaxx™software,gotoSessions
>Performanceandselecttherecord
snapshoticonfromthetoolbar.
2.GotoT ests>KOERAftertreatmentTests>
OnboardFilterCleanlinessTest.
WhenOBFCTiscomplete,stoprecording.Usethe
playbackfeatureandgraphthefollowingsignalvalues
fromOBFCT:
SignalValues:
•DieselOxidationCatalystInletTemperature
(DOCIT)
•DieselParticulateFilterInletT emperature(DPFIT)
•DieselParticulateFilterOutletT emperature
(DPFOT)
•DPFSootLoad
ComparesnapshottoGraph6and8page129.
Whichgraphdoessnapshotmostcloselymatch?
Graph6:DiagnosticsComplete
Graph8:Gotostep7
117
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