Fiat Bravo Service Manual page 193

Engine
Fuel system
Bravo-Brava ^
16v
10.
v<_
VEHICLE SPEED SENSOR
SWF B451
BORLETTI TGK
SO.GE.MI.
The sensor is located on the differential out­
put, near the left half-axle joint. It sends in­
formation on vehicle speed to the control
unit: the signal is also used to operate the
speedometer.
The sensor operates on the principle of the
Hall effect (see section on "engine timing
sensor") and transmits 16 pulses/revolution.
Vehicle speed can therefore be calculated
from pulse frequency.
Removing - refitting
Disconnect electrical connection and remove
the sensor.
E
Tightening torque 0.8 daNm
Wiring diagram
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SAFETY AND VENTILATION VALVE
This valve is located in the fuel filler cap and
performs the following functions according
to the pressure level in the tank:
When the pressure inside the tank exceeds
0.13 - 0.18 bar, excess fuel vapours are
vented to the outside (pressure-relief func­
tion).
If, on the other hand, a vacuum builds up
inside the tank, equivalent to 0.020 - 0.030
bar, air is taken into the tank (ventilation
function).
46 Publication no. 506.670