Navistar MaxxForce 9 - Page 144

DIAGNOSTICMANUAL
1.AftertreatmentFuelShutoffValve
(AFTFSV)
2.AftertreatmentFuelInletSensor
(AFTFIS)
3.AftertreatmentFuelDoser
(AFTFD)
4.AftertreatmentFuelPressure2
(AFTFP2)sensor
Figure37DSIUnit(MaxxForce®11and13Engines)
DownstreamInjection(DSI)Unit
TheDSIunitisconnectedtothecleansideofthelowpressurefuelsystem,andwillprovideameteredamount
offueltotheAFI.TheDSIunitprovidespressurizedfuelinjectionpulsestotheAFI.TheAFIisamechanical
poppettypeinjector,andwillonlyinjectfuelwhenfuellinepressureisincreasedaboveaspecicpressure.
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