8-VALVE 1.4
ENGINE
FIAT PUNTO TRAINING OUTLINE
Fiat Auto S.p.A.
After Sales Training
4.5.19 Phase variator control
The phase variator is fully managed by the engine management control unit which:
measures the camshaft position through the phase sensor;
modifies such position depending on the engine operation point according to a calibrated map;
keeps the camshaft position under control.
The phase variator motion takes place through the pressure of the engine oil that flows into
the advance/delay openings. A box solenoid valve makes the oil flow into the advance
openings (the variator will move in the direction of the advance, which corresponds to the rest
position) or the delay openings (the variator will move in the direction of the delay), or into the
advance and delay openings alternately and continuously (the variator remains in the
controlled position).
The control unit drives the variator driving solenoid valve through a duty-cycle command.
4.6 Procedures
4.6.1 Camshaft assembling position self-learning procedure
When and why should this procedure be carried out?
This procedure allows the ECM to self-learn the camshaft position with respect to the phonic
wheel, in order to diagnose any assembling anomalies.
The procedure must be carried out again in the following cases:
phonic wheel actuation/replacement;
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revs sensor actuation/replacement;