Navistar MaxxForce DT - Downstream Injection (DSI) Unit

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DIAGNOSTICMANUAL

1.DownstreamInjection(DSI)unit

Figure14DSIUnit(MaxxForce®DT ,9and10Engines)

DownstreamInjection(DSI)Unit

TheDSIunitisconnectedtothecleansideofthelow-pressurefuelsystem,andwillprovideametered

amountoffueltotheAftertreatmentFuelInjector(AFI).TheDSIunitprovidespressurizedfuelinjectionpulses

totheAFI.TheAFIisamechanicalpoppettypeinjector,andwillonlyinjectfuelwhenfuellinepressure

isincreasedaboveaspecicpressure.

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