ENGINE 1.3L QUADRAJET (90PS)
105
OPERATION
A current-carrying semiconductor layer immersed in
a normal magnetic field (force lines at right angles to
current direction) generates a potential difference
known as a Hall voltage at its terminals.
If current intensity remains constant, the generated
voltage depends on magnetic field intensity alone.
Periodic changes in magnetic field intensity are
sufficient to generate a modulated electrical signal
with frequency proportional to the speed of magnetic
field change.
To produce this change, a tooth on the inner part of
the pulley periodically moves close to the sensor.
PIN_OUT
Pin
Description
Signal type
1
Earth
Earth
2
Timing signal
Frequency output
3
Power supply 12 V input
In the specific case of the timing sensor it receives a
5 Volt power supply from the engine management
control unit.
All the times the rotor passes in front of the sensor a
variation in the actual sensor output voltage is
produced through the Hall effect; this variation takes
place for the entire duration that the rotor passes in
front of the sensor after which the signal returns to
the original value (5V).
10 ms
5 V
3 2 1
