DIAGNOSTICMANUAL
Ohm(Ω)
Theunitofelectricalresistance.Oneohmisthevalueofresistancethroughwhichapotentialofonevoltwill
maintainacurrentofoneampere.(SAEJ1213NOV82)
OxidesofNitrogen(NOx)
Nitrogenoxidesformedbyareactionbetweennitrogenandoxygenathightemperatures.
OxygenSensor(O
2
S)
Asensorthatmonitorsoxygenlevelsintheexhaust.
Particulatematter
Particulatematterincludesmostlyburnedparticlesoffuelandengineoil.
Piezometer
Aninstrumentformeasuringuidpressure.
Power
Powerisameasureoftherateatwhichwork(forcexdistance)isdoneduringaspecictime.Compare
withTorque.
PowerTakeOff(PTO)
Accessoryoutput,usuallyfromthetransmission,usedtopowerahydraulicpumpforaspecialauxiliary
feature(garbagepacking,liftequipment,etc).
PulseWidthModulation(PWM)
Successionofdigitalelectricalpulses,ratherthanananalogsignal.Efcientmethodofprovidingpower
betweenfullyonandfullyoff.
RandomAccessMemory
(RAM)
Computermemorythatstoresinformation.InformationcanbewrittentoandreadfromRAM.Input
information(currentenginespeedortemperature)canbestoredinRAMtobecomparedtovaluesstoredin
ReadOnlyMemory(ROM).AllmemoryinRAMislostwhentheignitionswitchisturnedoff.
Ratedgrosshorsepower
Enginegrosshorsepoweratratedspeedasdeclaredbythemanufacturer.(SAEJ1995JUN90)
Ratedhorsepower
Maximumbrakehorsepoweroutputofanengineascertiedbytheenginemanufacturer.Thepowerof
anenginewhenconguredasabasicengine.(SAEJ1995JUN90)
Ratednethorsepower
Enginenethorsepoweratratedspeedasdeclaredbythemanufacturer.(SAEJ1349JUN90)
Ratedspeed
Thespeed,asdeterminedbythemanufacturer,atwhichtheengineisrated.(SAEJ1995JUN90)
Ratedtorque
Maximumtorqueproducedbyanengineascertiedbythemanufacturer.
Referencevoltage(V
REF
)
A5voltreferencesuppliedbytheECMtooperatetheenginesensors.
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