Navistar MaxxForce 9 Diagnostic Manual

DIAGNOSTICMANUAL
Step
ActionDecision
5B
Checkforlowfuelrailpressure.UsingElectronic
ServiceTool(EST)withServiceMaxx™software,use
theplaybackfeatureandgraphthefollowingsignal
valuesfromLugDownT est:
SignalValues:
•EngineSpeed
•FuelRailPressure(FRP)
•FuelRailPressureDesired(FRPD)
ComparesnapshottoGraph3andassociatedGraph
Analysispage124.
IsFRPreactingtoFRPDasperGraph3Graph
Analysis?
Yes:Gotostep5C
No:Diagnoseandrepairlowfuelrail
pressure(SeePerformanceDiagnostics
sectioninEngineDiagnosticManual).
Afterrepairsarecomplete,retestfor
originalproblem.
Step
ActionDecision
5CVerifyaftertreatmentsystemisfreeofrestrictions.Using
ElectronicServiceTool(EST)withServiceMaxx™
software,usetheplaybackfeatureandgraphthe
followingsignalvaluesfromLugDownTest:
SignalValues:
•EngineSpeed
•Turbocharger1TurbineOutletPressure(TC1TOP)
ComparesnapshottoGraph4andassociatedGraph
Analysispage120.
IsTC1TOPsignaloperatingasperGraph4Graph
Analysis?
Yes:GotoStep5D
No:RepairTC1TOPissue(See
ElectronicControlSystemsDiagnosticsin
EngineDiagnosticManual).Afterrepairs
arecomplete,retestfororiginalproblem.
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Navistar MaxxForce 9 Specifications

General

Brand	Navistar
Model	MaxxForce 9
Category	Engine
Language	English