
Marea- Marea Weekend ©
20v
99 range
Engine
Fuel system
10.
The sensor can be rapidly put out of action by the presence of even slight amounts of lead in the
fuel.
Checking the resistance
The resistance of the heater and the senor can
be measured by disconnecting the connector
and connecting an ohmmeter as illustrated in
the diagram.
Resistance = 500-1000 ohm at 20°C
4A31LJ02
SPEEDOMETER SENSOR
The speedometer sensor (vehicle speed sen-
sor) is located at the differential output, by the
left driveshaft coupling and trasmits informa-
tion concerning the vehicle speed to the con-
trol unit: the signal is also used for the opera-
tion of the speedometer.
The sensor is the Hall effect type (see "engine
timing sensor" paragraph) and is calibrated so
that a distance of one metre corresponds to
each impulse; it is therefore possible to deter-
mine the speed of the vehicle from the fre-
quency of the impulses.
The control unit uses this information to im-
prove the management of the engine idle ad-
justment actuator and for the CUT-OFF strat-
egy.
Connector wiring
The numbers indicate the corresponding con-
trol unit pins.
Copyright by Fiat Auto
31
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