Navistar MaxxForce DT - Page 98

DIAGNOSTICMANUAL
WARNING
Topreventpersonalinjuryordeath,donotexceedlocalspeedlimitlawsordrivetoofast
forconditionswhenperformingLugDownTest.
Step
ActionDecision
9A
UsingEST ,gotoSessions>Performance.Findanopen
stretchofroadinordertoperformLugDownT est.When
drivingconditionsaresafe,selecttherecordsnapshoticon
fromthetoolbar,andperformLugDownprocedurebelow:
1.Selectasuitablehighrangegear(Example:Ina
10speedgearbox,selectthe8thspeed).
2.Allowenginespeedtodropto1000rpm.
3.Pressacceleratorpedalfullytotheoor,and
acceleratetoratedenginespeed.
AfterLugDownTestiscomplete,stoprecordingandsave
snapshot.
Gotostep9B
Step
ActionDecision
9B
Checkforlowfuelrailpressure.UsingESTwith
ServiceMaxx™software,usetheplaybackfeatureandgraph
thefollowingsignalvaluesfromLugDownT est:
SignalValues:
•EngineSpeed
•FuelRailPressure(FRP)
•FuelRailPressureDesired(FRPD)
ComparesnapshottoGraph3andassociatedGraph
Analysispage124.
IsFRPsignaloperatingasperGraph3GraphAnalysis?
Yes:Gotostep9C
No:Diagnoseandrepairlowfuel
railpressure(SeePerformance
DiagnosticssectioninEngine
DiagnosticManual).Afterrepairsare
complete,retestfororiginalproblem.
94
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