Navistar MaxxForce DT - Service Procedures: Fuel System

DIAGNOSTICMANUAL
4.6.GRAPH6:ERRATICEXHAUSTGASTEMPERATURES
1.DieselOxidationCatalystInlet
Temperature(DOCIT)(degrees
Fahrenheit)[Green]
2.DieselParticulateFilterInlet
Temperature(DPFIT)(degrees
Fahrenheit)[Orange]
3.DieselParticulateFilterOutlet
Temperature(DPFOT)(degrees
Fahrenheit)[Blue]
Figure10Graph6:ErraticExhaustGasTemperatures
GraphAnalysis:
Thisgraphshowserraticexhaustgastemperatures.Erratictemperaturesintheexhauststreamoccurwhen
theDieselOxidationCatalystbecomescontaminated,oranissuewiththeAftertreatmentFuelInjector(AFI)
ispresent.Thistestdoesnotgivepassorfailresults.Itonlyallowstheusertovalidateoperationofthe
aftertreatmentsystembymonitoringexhaustgastemperatures.
Actions:
1.AfterDieselOxidationCatalyst(DOC)reachesoperatingtemperature,verifyDieselParticulate
FilterInletT emperature(DPFIT)andDieselParticulateFilterOutletT emperature(DPFOT)signal
valuesdonotuctuatemorethan50°F(28°C)within2minutes.Inthisgraph,DPFITandDPFOT
uctuatemorethan50°F(28°C)within2minutes.
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