DISCOVERY
ETM E1
CIRCUITOPERATION
EngineCoolantTemperatureGauge
TheEngineCoolantTemperatureGaugeSensor
(X114)hasapproximately136ohmsresistance
whenthecoolanttemperatureislow.Ascoolant
temperatureincreases,theresistanceofthe
sensordecreases.Thisvaryingresistancecauses
thecurrentthroughthesensortochangeandthe
gaugetoregisterthetemperature.Whenthe
coolantishot,theresistanceofthesensoris
approximately17ohms.
FuelGauge
Whenthefueltanklevelislow,theresistanceof
thefuelgaugesenderisapproximately245ohms.
Asthefuellevelincreases,theresistanceofthe
senderdecreases,causingthegaugetoregister
thechange.Whenthefueltankisfull,the
resistanceofthesenderisapproximately19
ohms.Whenthefuelgaugesender'sresistance
fallsbelowapproximately25ohms(6liters/1.5US
gallons),thefuelwarninglightwillilluminateto
warnthedriver.
Speedometer
TheVehicleSpeedSensor(X190)sendsasignal
tothespeedometerintheformofvoltagepulses.
ThepulsesarefilteredbyaVehicleSpeedSensor
Bufferinsidethespeedometer.Thevoltage
alternatesbetweenbatteryvoltageand0volts6
timesperwheelrevolution.Thespeedsensor
signalisalsosenttotheCruiseControlECU
(Z121),MultifunctionUnit(MFU)(Z148)(Persian
GulfStates),andtheEngineControlModule
(Z132).
Tachometer
Thetachometerdisplaysenginespeedinrpm.
VoltagepulsesaretakenfromtheGenerator
(Z106)andaregeneratedwhentheenginedrive
beltturnstheGeneratorpulley.Thetachometer
respondstothefrequencyofthevoltagepulses,
whichincreasesproportionallytothatofthe
enginespeed.
E L E C T R I C A L T R O U B L E S H O O T I N G M A N U A L
1
| Categories | Land Rover, Land Rover Discovery |
|---|---|
| Tags | Land Rover |
| Model Year | 1995 |
| Download File |
|
| Document Type | Electrical Troubleshooting Manual |
| Language | English |
| Product Name | Discovery |
| Product Brand | Land Rover |
| Document File Type | |
| Publisher | landrover.com |
| Wikipedia's Page | http://en.wikipedia.org/wiki/Land_Rover |
| Copyright | Attribution Non-commercial |
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