Navistar MaxxForce 9

DIAGNOSTICMANUAL
Step
ActionDecision
11B
CheckforInjectionControlPressure(ICP)systemissue.Using
ESTwithServiceMaxx™software,usetheplaybackfeatureand
graphthefollowingsignalvaluesfrom0to60mphtest:
SignalValues:
•ICPdesired
•ICP
•InjectionPressureRegulator(IPR)valvecontrol%
ComparesnapshottoGraph3andassociatedGraphAnalysis
page54.
IsICPsystemoperatingasperGraph3GraphAnalysis?
Yes:Gotostep11C
No:DiagnoseandrepairICP
systemissue(SeeHardStart
andNoStartDiagnostics
sectioninEngineDiagnostic
Manual).Afterrepairsare
complete,retestfororiginal
problem.
Step
ActionDecision
11CCheckforAirManagementSystem(AMS)issue.UsingESTwith
ServiceMaxx™software,usetheplaybackfeatureandgraphthe
followingsignalvaluesfrom0to60mphtest:
SignalValues:
•EngineSpeed
•EngineLoad
•IntakeManifoldPressure(IMP)
•ExhaustBackPressure(EBP)
•AcceleratorPedalPosition1(APP1)
ComparesnapshottoGraph4andassociatedGraphAnalysis
page55.
IsAMSoperatingasperGraph4GraphAnalysis?
Yes:Gotostep12
No:Diagnoseandrepair
AMSissue(SeePerformance
DiagnosticssectioninEngine
DiagnosticManual).After
repairsarecomplete,retest
fororiginalproblem.
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