Engine
Fuel system
16v
Marea- Marea Weekend 9
99 update
Wiring connector
Wiring connector
VEHICLE SPEED SENSOR
This sensor is positioned at the differential
output, by the left driveshaft coupling and it
transmits information to the control unit con-
cerning the vehicle speed: 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 therefore possible
to ascertain the speed of the vehicle from the
frequency of the impulses.
DETONATION SENSOR
This is a piezoelectric type sensor fitted on the
cylinder block/crankcase in a symmetrical po-
sition in relation to the pairs of cylinders 1 -2
and 3-4.
This position is determined by the need to de-
tect the onset of detonation in the same way
for all cylinders.
When the engine is knocking, crankcase vibra-
tions of a particular frequency are produced
which are transformed by the sensor into a
voltage signal proportional to their intensity.
30
Print n° 506.763/15
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