8-VALVE 1.4
ENGINE
FIAT PUNTO TRAINING OUTLINE
Fiat Auto S.p.A.
After Sales Training
Operation
The pulley on the cam axle is made up of 4 projections. During the pulley rotation, the distance
between the pulley and the phase sensor varies, and a low voltage signal is generated at each
projection.
Conversely, when these projections are not found, the sensor will generate a higher voltage
signal.
It follows that the high signal alternates with the low signal four times every single engine
cycle.
This signal, together with the T.D.C. and revs signal, allows the control unit to recognize the
cylinders and determine the injection and ignition point.
Electric features
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1: Ground
2: Output or signal
3: Supply voltage