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Engine
Fuel system
Bravo-Brava i g j ^
98 range
ENGINE COOLANT TEMPERATURE SEN
SOR
This sensor is fitted on the thermostat and de
tects the temperature of the engine coolant by
means of an NTC thermistor with a negative re
sistance coefficient.
The sensor is produced using semiconductor
technology, therefore if the temperature of the
sensor element increases as the temperature of
the coolant increases, the resistance value de
creases as a result.
As the variation in the resistance is not linear,
the same increase in temperature is greater at
lower temperatures than at higher temperatures.
1. NTC resistance
2. Sensor body
3. Electrical connector
FUEL TEMPERATURE SENSOR
This sensor is fited on the return manifold and
detects the temperature of the fuel through an
NTC thermistor which has a negative resistance
coefficient.
For the operation of the sensor, refer to the pre
vious description dealing with the coolant tem
perature sensor.
FUEL PRESSURE SENSOR
This sensor is fitted in the centre of the fuel sup
ply manifold (rail) and has the task of supplying
the
injection
control
unit
with
a
return
("feed-back") signal for:
- regulating the injection pressure;
- regulating the duration of the injection.
14
Print no.
506.670/16
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