Navistar MaxxForce 9

DIAGNOSTICMANUAL
Step
ActionDecision
4
CheckforfailedAirManagementSystem(AMS)
actuator.
1.UsingElectronicServiceTool(EST)with
ServiceMaxx™software,gotoTests>Load
TestSpecicSessionandverifyLoadT est
SpecicSessionisunchecked.
2.GotoSessions>Performanceandselect
therecordsnapshoticonfromthetoolbar.
3.GotoT ests>KOERT ests>Air
ManagementT est.WhenAirManagement
Testiscomplete,stoprecording.Usethe
playbackfeatureinServiceMaxx™,and
graphthefollowingsignalvalues:
SignalValues:
•EngineSpeed
•IntakeManifoldPressure(IMP)
•Turbocharger2Wastegatecontrol(TC2WC)
DoessnapshotmatchGraph1orGraph2page120?
Graph1:Gotostep5A
Graph2:Diagnoseandrepairfailed
actuator(SeePerformanceDiagnostics
sectioninEngineDiagnosticManual).
Afterrepairsarecomplete,retestfor
originalproblem.
WARNING
Topreventpersonalinjuryordeath,donotexceedlocalspeedlimitlawsordrivetoofast
forconditionswhenperformingLugDownTest.
Step
ActionDecision
5A
Checkforengineperformanceissues.UsingEST ,go
toSessions>Performance.Findanopenstretchof
roadinordertoperformLugDownT est.Whendriving
conditionsaresafe,selecttherecordsnapshoticonfrom
thetoolbar,andperformLugDownprocedurebelow:
1.Selectasuitablehighrangegear(Example:
Ina10speedgearbox,selectthe8th
speed).
2.Allowenginespeedtodropto1000RPM
3.Pressacceleratorpedalfullytotheoor,
andacceleratetoratedenginespeed.
AfterLugDownT estiscomplete,stoprecordingand
savesnapshot.
Gotostep5B
115
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