MANUALS · FUEL [13] · страница 40 из 340 · Открыть оригинал PDF ↗

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Датчик температуры охлаждающей жидкости

OPERATION

The engine coolant temperature sensor functions
to convert the barometric pressure to voltage, and
to input that voltage (as signals) to the engine
control unit.Theengine control unit, based upon
those signals, regulates the amount of fuel injec-
tion and the fast-idling speed when the engine is
cold_

The 5Vpower supply within the engine con-
trol unit is supplied, by way of the resistance
withintheunit;totheenginecoolant
temperature sensor; it passes through theen-
sensorwhich is
gine coolant temperature
type of resistor,and is earthed at the engine
controlunit.Notethat the resistance ofthe
engine coolant temperature sensor decreases
when the temperatureof the engine coolant
increases.

The engine coolant temperature sensor terminal
voltage becomes higher when the resistace of the
engine coolant temperature sensor increases, and
becomes lower when the resistance decreases_
Consequently,theenginecoolanttemperature
sensor terminal voltage varies in accordance with
the temperature of the engine coolant, becoming
lower when the temperature of the engine coolant
increases

TROUBLESHOOTING HINTS

If, during engine warm-Up, the fast-idling speed is not
correct,or black smoke is emitted, the problem is
usually a malfunction of the coolant temperature sen-
sOr

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