Navistar MaxxForce 13 - Page 111

DIAGNOSTICMANUAL
WARNING
Topreventpersonalinjuryordeath,donotexceedlocalspeedlimitlawsordrivetoofast
forconditionswhenperformingLugDownTest.
Step
ActionDecision
9A
UsingEST ,gotoSessions>Performance.Findanopen
stretchofroadinordertoperformLugDownT est.When
drivingconditionsaresafe,selecttherecordsnapshoticon
fromthetoolbar,andperformLugDownprocedurebelow:
1.Selectasuitablehighrangegear(Example:
Ina10speedgearbox,selectthe8thspeed).
2.Allowenginespeedtodropto1000rpm.
3.Pressacceleratorpedalfullytotheoor,and
acceleratetoratedenginespeed.
AfterLugDownT estiscomplete,stoprecordingandsave
snapshot.
Gotostep9B
Step
ActionDecision
9B
CheckforlowFuelRailPressure.UsingESTwith
ServiceMaxx™software,usetheplaybackfeatureand
graphthefollowingsignalvaluesfromLugDownT est:
SignalValues:
•EngineSpeed
•FuelRailPressure(FRP)
•FuelRailPressureDesired(FRPD)
ComparesnapshottoGraph3andassociatedGraph
Analysispage124.
IsFRPsignaloperatingasperGraph3GraphAnalysis?
Yes:Gotostep9C
No:Diagnoseandrepairlowfuelrail
pressure(SeePerformanceDiagnostics
sectioninEngineDiagnosticManual).
Afterrepairsarecomplete,retestfor
originalproblem.
107
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