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DIAGNOSTICMANUAL

9.2.SYMPTOM1(HEAVYDUTY):FREQUENTPARKEDREGENSWITHNOACTIVE

FAULTCODES(MORETHANONEPARKEDREGENPERDAY)

NOTE–Beforebeginningthefollowingstep-baseddiagnostics,performallvehicleoperationalchecks

page80.

NOTE–Thenumberofregensperformedinonedaymayvarydependingonapplication.Thefollowing

criteriashouldbeusedtodetermineifaregenisconsideredfrequent:

•Line-haul:Morethan1parkedregenperdayisfrequentregeneration.

•Severeservice:Morethan2parkedregensperdayisfrequentregeneration.

Step

ActionDecision

CheckforafailedAirManagementSystem(AMS)actuator.

1.UsingElectronicServiceT ool(EST)with

ServiceMaxx™software,gotoT ests>LoadT est

SpecicSessionandverifyLoadT estSpecic

Sessionisunchecked.

2.GotoSessions>Performanceandselectthe

recordsnapshoticonfromthetoolbar.

3.GotoT ests>KOERT ests>AirManagementT est.

WhenAirManagementTestiscomplete,stoprecording.Use

theplaybackfeatureinServiceMaxx™,andgraphthefollowing

signalvalues:

SignalValues:

•EngineSpeed

•IntakeManifoldPressure(IMP)

•Turbocharger2WastegateControl(TC2WC)

DoessnapshotmatchGraph1orGraph2page120?

Graph1:Gotostep2A

Graph2:Diagnoseandrepair

failedactuator(SeePerformance

DiagnosticssectioninEngine

DiagnosticManual).Afterrepairs

arecomplete,retestfororiginal

problem.

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Navistar MaxxForce 9 Diagnostic Manual

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