Navistar MaxxForce 10

DIAGNOSTICMANUAL
10.8.GRAPH8:LOWEXHAUSTGASTEMPERATURES(RESTRICTEDAFI)
1.DieselOxidationCatalystOutlet
Temperature(DOCOT)(degrees
Fahrenheit)[Red]
2.DieselOxidationCatalyst(DOC)
atoperatingtemperatureand
stabilized.
3.DieselParticulateFilterOutlet
Temperature(DPFOT)(degrees
Fahrenheit)[Purple]
4.DieselOxidationCatalystInlet
Temperature(DOCIT)(degrees
Fahrenheit)[Green]
5.DieselParticulateFilter(DPF)soot
load(percent)[Blue]
Figure33Graph8:LowExhaustGasTemperatures(RestrictedAFI)
GraphAnalysis:
ThisgraphshowslowexhaustgastemperaturesindicatingarestrictedAftertreatmentFuelInjector(AFI).Low
temperaturesintheexhauststreamoccurwhenDieselOxidationCatalystOutletT emperature(DOCOT)and
DieselParticulateFilterOutletT emperature(DPFOT)arelessthan900°F(482°C)aftertheDOChasreached
operatingtemperatureandstabilized(seecallout2,graph8).Thisiscausedbyrestrictedfuelowfromthe
AFI,resultinginlessfuelburningintheexhauststream.Thistestdoesnotgivepassorfailresults.Itonly
allowstheusertovalidateoperationoftheaftertreatmentsystembymonitoringexhaustgastemperatures.
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