Navistar MaxxForce 9

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DIAGNOSTICMANUAL

DPFStatusTest

ThistestchecksthestatusoftheDPFiftheSootleveliswithinaRegenNeededlimit.Thetestwillautomatically

startaParkedRegen.

NOTE–TheKOERStandardTestmustberunbeforeperformingthistest.

ThistestwillperformacompleteParkedRegen.

EnginespeedisrampeduptoincreaseexhaustowthroughtheDPFwhiletheDPFDPsensormonitorsthe

pressuredifferenceacrosstheDPF .Thetestrunsforabout15minutes.IfaRegenisneeded,theengineramps

upforanother15minutes,butthistimetorunDPFRegencycle.

ThefollowingconditionsarerequiredforaOnboardFilterCleanlinessT est.

•EngineRunning

•EngineCoolantTemperatureisaboveoratleast170ºF(75ºC)

•Vehiclestationary

•InhibitDTCsmustnotbeactive:GotoRegenInhibitorspage152

•PTOnotactive(switchmustbeoff)

•Regeninhibitswitchnotactive(switchmustbeoff)

•Parkingbrakemustbeapplied

•Brakepedalnotdepressed

•Acceleratorpedalnotdepressed

•Drivelinedisengaged

•IftheSootleveliswithinnormalrange,thetestcompletesanddisplays“T estCompletedSuccessful.”This

testdoesnotgivepassorfailresults.Thetestonlyallowstheoperationoftheaftertreatmentsystemtobe

validatedbymonitoringtheeffectsofDOCIT ,DOCOT,DPFOT ,andDPFDPsensor.

•Ifthetestisaborted,gotoRegenInhibitorspage152.Ifnoregeninhibitorsareidentied,gotoappropriate

aftertreatmentsystemdiagnosticssectioninthismanual.

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