Aprilia Consumer Service Spa
Technical Service and Training
Release 4 july 99
This material is didactic and
may be changed following the technical
development of the product
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Timing control
The times are controlled by the reading of the position of the crankshaft and
the position of the camshaft. The control unit also detects the starting phase, injecting the fuel into
the cylinders asynchronously.
Crankshaft sensor
Camshaft position sensor
Reads the position of the crankshaft, discretizing angles of
60°
Sends a voltage to the control unit, like any pick-up.
This signal controls the fuel pump via the ECU.
Reads the position of the camshaft and sends the signal to
the ECU. The sensor reads the position of the front cylinder
only.