Fiat 1996 Brava Service Manual page 337

Bravo @ 20v
98 range
Engine
Fuel system
10.
R r a The sensor can be rapidly put out of action by even small amounts of lead in the fuel.
Checking the resistance
The resistance of the heater and the sensor
can be measured by disconnecting the con­
nector and connecting an ohmmeter as
shown in the diagram.
Resistance = 500-1000 ohm at 20°C
SPEEDOMETER SENSOR
The speedometer sensor (vehicle speed sen­
sor) is positioned at the differential outpur,
by the left driveshaft coupling and transmits
information concerning the vehicle speed to
the control unit: the signal is also used for the
operation of the speedometer.
The sensor is the Hall effect type (see para­
graph on "engine timing sensor") and is cali­
brated so that each impulse corresponds to a
distance of one metre; it is possible to know
the speed of the vehicle from the frequency
of the impulses.
The control unit uses this information for im­
proving the management of the engine idle
adjustment actuator and for the CUT-OFF
strategy.
Wiring connector
The numbers indicate the corresponding
control unit pins
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