Navistar MaxxForce 9 Diagnostic Manual

DIAGNOSTICMANUAL
Step
ActionDecision
9CVerifyaftertreatmentsystemisfreeofrestrictions.Using
EST,usetheplaybackfeatureandgraphthefollowingsignal
valuesfromLugDownTest:
SignalValues:
•EngineSpeed
•Turbocharger1TurbineOutletPressure(TC1TOP)
ComparesnapshottoGraph4andassociatedGraph
Analysispage126.
IsTC1TOPsignaloperatingasperGraph4GraphAnalysis?
Yes:Gotostep9D
No:Gobacktostep1toverifyeach
stepwascompletedcorrectlyandthe
properdecisionwasmade.
Step
ActionDecision
9D
CheckforanIntakeManifoldPressure(IMP)issue.Usethe
playbackfeatureinServiceMaxx™,andgraphthefollowing
signalvaluesfromLugDownTest:
SignalValues:
•EngineSpeed
•IntakeManifoldPressure(IMP)
•AcceleratorPedalPosition1(APP1)
•VehicleSpeed
ComparesnapshottoGraph5andassociatedGraph
Analysispage127.
IsIMPoperatingasperGraph5GraphAnalysis?
Yes:Diagnosticscomplete
No:DiagnoseandrepairIMPissue
(SeePerformanceDiagnosticssection
inEngineDiagnosticManual).After
repairsarecomplete,retestfororiginal
problem.
95
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Navistar MaxxForce 9 Specifications

General

Brand	Navistar
Model	MaxxForce 9
Category	Engine
Language	English