Fiat Bravo Service Manual page 238

Engine
Fuel system
Bravo-Brava 10k
lev
10.
P4A28BJ01
BUTTERFLY POSITION SENSOR
It is made up of a single track potentiometer
where the moving part is rotated by the ac­
celerator butterfly shaft.
Wiring connector
COOLANT TEMPERATURE SENSOR
The sensor is fitted on the thermostat.
It is made up of a brass casing which protects
the resistive element made up of an NTC
(Negative Temperature Coefficient) thermis­
tor where the electrical resistance decreases
as the temperature increases.
The reference voltage is 5 Volt: since the con­
trol unit input circuit is designed as a voltage
divider, the reference voltage is shared be­
tween a resistance in the control unit and the
actual sensor.
As a result the control unit is capable of eval­
uating the variations in the sensor resistance
through the changes in voltage.
Wiring connector
P4A28BJ04
28 Print no. 506.670