1.3 MULTIJET 16V
(75 & 90 HP)
FIAT PUNTO TRAINING OUTLINE
Fiat Auto S.p.A.
After Sales Training
Operation
The shift from the full to the empty condition, due to the presence or absence of the tooth,
causes a variation of the magnetic flux which is enough to generate an induced, alternating
voltage resulting from the count of the teeth placed onto one ring (or phonic wheel).
The frequency and amplitude of the voltage sent to the electronic control unit provide the latter
with the measurement of the drive shaft angular speed.
Cam or phase angle sensor
This is a Hall-effect sensor fitted to the overhead just next to the distributing shaft, on the
exhaust side.
A tooth is obtained on the overhead, which allows the phase sensor to signal the engine timing
position.
The injection control unit uses the phase sensor signal to know the top dead centres at the
end of the compression phase and also synchronize, during the starting phase, the injections
with respect to the position of the pistons.
Phase sensor
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