Sensors

Sensors

Connector wiring

Wiring connector

VEHICLE SPEED SENSOR

This sensor is positioned at the differential output, 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 paragraph on "engine timing sensor") and is calibrated so that a distance of one metre corresponds to each impulse: it is therefore possible to deduce the speed of the vehicle from the frequency of the impulses.

DETONATION SENSOR

This sensor is the piezoelectric type and is fitted on the cylinder block/crankcase in a position which is symmetrical in relation to the pairs of cylinders 1-2 and 3-4.

This position is determined by the need to detect the onset of detonation in the same way for all cylinders.

When there is engine "knock", vibrations of a particular frequency are produced which are transformed by the sensor into a voltage signal, proportional to their intensity.