Navistar MaxxForce 9

DIAGNOSTICMANUAL
Step
ActionDecision
5B
CheckforInjectionControlPressure(ICP)systemissue.Onthe
ElectronicServiceTool(EST)withServiceMaxx™software,use
theplaybackfeatureandgraphthefollowingsignalvaluesfrom
the0to60MPHT est:
•ICPDesired
•ICPActual
•InjectionPressureRegulator(IPR)valvecontrol%
ComparesnapshottoGraph3andassociatedGraphAnalysis
page54.
IsICPsystemoperatingasperGraph3GraphAnalysis?
Yes:Gotostep5C
No:DiagnoseandrepairICP
systemissue(SeeHardStart/No
StartDiagnosticssectionin
EngineDiagnosticManual).After
repairsarecomplete,gotoStep
10A.
Step
ActionDecision
5CCheckforAirManagementSystem(AMS)issue.Onthe
ElectronicServiceTool(EST)withServiceMaxx™software,use
theplaybackfeatureandgraphthefollowingsignalvaluesfrom
the0to60MPHT est:
•EngineSpeed
•EngineLoad
•IntakeManifoldTemperature(IMP)
•ExhaustbackPressure(EBP)
•AcceleratorPedalPosition1(APP1)
ComparesnapshottoGraph4andassociatedGraphAnalysis
page55.
IsAMSoperatingasperGraph4GraphAnalysis?
Yes:GOtostep6
No:Diagnoseandrepair
AMSissue(SeePerformance
DiagnosticssectionintheEngine
DiagnosticManual).Afterrepairs
arecomplete,gotostep10A.
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