Navistar MaxxForce 9

DIAGNOSTICMANUAL
Step
ActionDecision
2CVerifyaftertreatmentsystemisfreeofrestrictions.UsingEST ,
usetheplaybackfeatureandgraphthefollowingsignalvalues
fromLugDownT est:
SignalValues:
•EngineSpeed
•Turbocharger1TurbineOutletPressure(TC1TOP)
ComparesnapshottoGraph4andassociatedGraphAnalysis
page126.
IsTC1TOPsignaloperatingasperGraph4GraphAnalysis?
Yes:Gotostep2D
No:RepairTC1TOPissue(See
ElectronicControlSystems
DiagnosticsinEngineDiagnostic
Manual).Afterrepairsarecomplete,
retestfororiginalproblem.
Step
ActionDecision
2D
CheckforanIntakeManifoldPressure(IMP)issue.Usethe
playbackfeatureinServiceMaxx™,andgraphthefollowing
signalvaluesfromLugDownT est:
SignalValues:
•EngineSpeed
•IntakeManifoldPressure(IMP)
•AcceleratorPedalPosition1(APP1)
•VehicleSpeed
ComparesnapshottoGraph5andassociatedGraphAnalysis
page127.
IsIMPoperatingasperGraph5GraphAnalysis?
Yes:Gotostep3
No:DiagnoseandrepairIMPissue
(SeePerformanceDiagnostics
sectioninEngineDiagnostic
Manual).Afterrepairsarecomplete,
retestfororiginalproblem.
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