DIAGNOSTICMANUAL
9.4.SYMPTOM3(HEAVYDUTY):SPN3719ACTIVEONLYORFREQUENTREGENS
(MORETHANONEPARKEDREGENPERDAY)
NOTE–Beforebeginningthefollowingstep-baseddiagnostics,performallvehicleoperationalchecks
page80.
NOTE–Thenumberofregensperformedinonedaymayvarydependingonapplication.Thefollowing
criteriashouldbeusedtodetermineifaregenisconsideredfrequent:
•Line-haul:Morethan1regenperdayisfrequentregeneration.
•Severeservice:Morethan2regensperdayisfrequentregeneration.
Step
ActionDecision
1
DoOnboardFilterCleanlinessTest(OBFCT)toclearSPN
3719activefaultcode(s).UsingElectronicServiceTool
(EST)withServiceMaxx™software,gotoSessions>
Performanceandselecttherecordsnapshoticonfromthe
toolbar.ThengotoT ests>KOERAftertreatmentT ests>
OnboardFilterCleanlinessT est.
IsSPN3719stillactiveafterOBFCTiscomplete?
Yes:Gotostep2
No:Gotostep6
Step
ActionDecision
2
DetermineifDieselParticulateFilter(DPF),Pre-Diesel
OxidationCatalyst(PDOC),andDieselOxidationCatalyst
(DOC)arecontaminated.RemovetheDPF,PDOC,and
DOC(seeExhaustSystemServiceManual),andcheckfor
signsoflubeoilandcoolantcontamination.
NOTE–Ablackstainingintheexhausttailpipecanoccur
onapplicationsthatexperiencehighidletimes.Thisis
normalandtheDPFshouldNOTbereplaced.
AretheDPF ,PDOC,orDOCcontaminated?
Yes:Gotostep3
No:Gotostep4
Step
ActionDecision
3
DetermineifDPF ,DOC,andPDOCarereusableseeDPF
andDOCreuseguidelinespage159..
BasedonDPFandDOCRe-UseGuidelines,aretheDPF,
DOC,andPDOCreusable?
Yes:Gotostep5
No:Replacefailedcomponent(s).
Afterrepairsarecomplete,gotostep
5.
96
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