DIAGNOSTICMANUAL
TERMINOLOGY
AcceleratorPedalPosition
(APP)sensor
Apotentiometersensorthatindicatesthepositionofthethrottlepedal.
Actuator
Adevicethatperformsworkinresponsetoaninputsignal.
ActuatorControl
TheECMcontrolstheactuatorsbyapplyingalow-levelsignal(low-sidedriver)orahigh-levelsignal(high
sidedriver).Whenswitchedon,bothdriverscompleteagroundorpowercircuittoanactuator.
Aeration
Theentrainmentofairorcombustiongasincoolant,lubricant,orfuel.
Aftercooler(ChargeAirCooler)
Aheatexchangermountedinthechargeairpathbetweentheturbochargerandengineintakemanifold.
Theaftercoolerreducesthechargeairtemperaturebytransferringheatfromthechargeairtoacooling
medium(usuallyair).
AftertreatmentFuelDoser
(AFTFD)
ApartoftheDownStreamInjection(DSI)unitthatsendspressurizedfueltotheAftertreatmentFuel
Injector(AFI)toinjectfuelintotheexhaustpipe.
AftertreatmentFuelInjector
(AFI)
Injectsfuelintotheexhaustsystemtoincreasetemperatureoftheexhaustgases.
Aftertreatment(AFT)system
Apartoftheexhaustsystemthatprocessesengineexhausttomeetemissionrequirementsandtraps
particulatematter(soot)topreventitfromleavingthetailpipe.
AirControlValve(ACV)
ContainstheLPturbochargerwastegatecontrolport,HPturbochargerwastegatecontrolport,theEBPV
controlport,andtheTC1TOPport.AlthoughthesecomponentsareintegraltotheACV,eachcircuitis
controlledbytheECM.TheACVcontrolscompressedairforeachcontrolvalve.
Ambienttemperature
Theenvironmentalairtemperatureinwhichaunitisoperating.Ingeneral,thetemperatureismeasuredin
theshade(nosolarradiation)andrepresentstheairtemperatureforotherenginecoolingperformance
measurementpurposes.Airenteringtheradiatormayormaynotbethesameambientduetopossible
heatingfromothersourcesorrecirculation.(SAEJ1004SEP81)
Ampere(amp)
Thestandardunitformeasuringthestrengthofanelectricalcurrent.Theowrateofachargeina
conductororconductingmediumofonecoulombpersecond.(SAEJ1213NOV82)
Analog
Acontinuouslyvariablevoltage.
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