Navistar MaxxForce 9 Diagnostic Manual

DIAGNOSTICMANUAL
Horsepower(hp)
Horsepoweristheunitofworkdoneinagivenperiodoftime,equalto33,000poundsmultipliedbyone
footperminute.1hp=33,000lbx1ft./1min.
HumiditySensor(HS)
Asensorthatmeasuresthemoisturecontentoflteredairenteringtheintakesystem.
Hydrocarbons
Organiccompoundsconsistingofhydrogenandcarbon(fuelandoil).
Hydrocarbonslip
Anormalconditionthatoccursintheexhauststreaminhighidletimeapplications,wheredieselfueldoes
notfullycombustintheaftertreatmentsystemduringregeneration.Thedieselfuel“slips”throughtheDiesel
ParticulateFilter(DPF),andintothecleansideoftheexhaust.
InjectionPressureRegulator
(IPR)valve
Avalvethatisusedtomaintaindesiredinjectioncontrolpressure.
InjectionControlPressure(ICP)
sensor
ProvidesafeedbacksignaltotheECMindicatinginjectioncontrolpressure.
InletAirHeater(IAH)
TheIAHisprimarilyusedtoassistinstartingtheengineduringcoldweather.Inaddition,ithelpstoreduce
whitesmokeemissionsbyheatingtheincomingair.
InletAirHeaterFuelIgniter
(IAHFI)
TheIAHFIheatstheintakeairbyvaporizingandignitingfuelintheairinletduct.
InletAirHeaterFuelSolenoid
(IAHFS)
Astheengineiscranked,theECMenergizestheIAHFSvalve,introducingfuelintotheIAHFI,whichignites
andwarmstheairbeingdrawnintotheengine.
InletAirHeaterRelay(IAHR)
TheIAHRprovidesvoltagetotheIAHFI,andiscontrolledbytheECM.
InletAirTemperature(IAT)
sensor
Athermistorsensorthatmonitorsintakeairtemperature.
Intakemanifold
Enginecomponentthatevenlysuppliesairtoeachintakeportinthecylinderhead(s).
IntakeManifoldPressure(IMP)
sensor
Avariablecapacitancesensorusedtoindicateairpressureintheintakemanifold.
IntakeManifoldT emperature
(IMT)sensor
Athermistorsensorusedtoindicateairtemperatureintheintakemanifold.
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Navistar MaxxForce 9 Specifications

General

Brand	Navistar
Model	MaxxForce 9
Category	Engine
Language	English