Navistar MaxxForce DT - Page 136

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DIAGNOSTICMANUAL

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1.AfterDOCreachesoperatingtemperatureandstabilizes(seecallout3,graph7),verifyDPFOT

signalvalueisnot122°F(50°C)higherthanDOCOTsignalvalue.Inthisgraph,DPFOTsignal

valueis122°F(50°C)higherthanDOCOTindicatinginvertedexhaustgastemperatures.

2.VerifyDieselOxidationCatalystInletTemperature(DOCIT)signalvalueisbetween550°F(287°C)

to800°F(427°C).

NOTE–ItisnormaltoseeDieselOxidationCatalystInletTemperatureDOCIT,DOCOT ,andDPFOTsignal

valuestouctuateatthebeginningandendoftheOBFCT.

NOTE–SPN4766FMI10(DOCEfciency)maybeactivewhenexhaustgastemperaturesareinverted.

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