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1、Unit10IntroductiontoInstrumentClusterPart?ITechnicalandPracticalReadingPassageAGaugesandWarningLampsAnautomotiveinstrumentclustercontrolsystemisthebrainsbehindthecardashboard,poweringallgauges,displays,LEDwarninglampsandsoundsignals.Itsprimaryfunctionsaretocommunicatewithexternaldatasourcesandcontr
2、ollingdataoutputdevices.Seefigure10-1.Figure10-1Atypicalinstrumentclustermainlyhastachometer,speedometer,fuelgaugeandtemperaturegauge.1.Tachometer:measuresthespeedofrotationoftheengine,inrevolutionsperminute(rpm).Seefigure10-2.Figure10-2Tachometer2.Speedometer:measurestheinstantaneousspeedofacar.Se
3、efigure10-3.Figure10-3Speedometer3.Fuelgauge:thisgaugeworkswhenignitionisswitchedon.Whentheneedlereachestheredzoneandthewarninglamplightsup,thereisabout7litersleftinthetank.Seefigure10-4.Figure10-4FuelGauge4.Temperaturegauge:thegaugestartstoworkwhenignitionisswitchedon,butittakessometimebeforethene
4、edlereachesitsfinalposition.Seefigure10-5.Figure10-5TemperatureGaugeThelayoutofthewarminglampsdependsoncarmodels.TaketheBoraforinstance.Thesymbolsshownherearealsoontheactualwarninglamps,seefigure10-6below.Figure10-61.Airbagsystem:thewarninglamplightsupforafewsecondsandgoesoutwhentheingitionisswitch
5、edon.Oncarswiththepassenger-sideairbagdeactivatedthewarninglampwillthenflashforabout15seconds.Ifthewarninglampdoesnotgooutafterthegivenperiod,orifitlightsup,flashesorflickersduringajourney,thereisafaultintheairbagsystem.Thesystemshouldimmediatelybecheckedbyadealer.2.Mainbeam:thewarninglampcomesonwh
6、enmainbeamisonorwhentheheadlightflasherisused.3.Coolanttemperature/coolantlevel:whentheignitionisswitchedon,thewarninglampflashesforafewsecondsasafunctionalcheck.Ifthissymbollightsuporflasheswhendriving,eitherthecoolanttemperatureistoohighorthecoolantleveltoolow.4.Engineoilpressure/oillevel:thewarn
7、inglamplightsupforafewsecondsasafunctionalcheckwhenignitionisswitchedon.Ifthewarninglampdoesnotgooutanacousticsignalwillsound3timesasanadditionalwarning.Donotstarttheengine!Checkoillevelandifnecessary,addoi
