Gilera Nexus 500 Workshop Manual page 256

Injection
1 electronic control unit
2
The sensor allows the rotations and the angular position of the crankshaft to be recognised by reference
to the TDC. Since the wheel speed sensor is pivoted on the camshaft it is also possible to recognise
the 4-stroke cycle. Such solution allows controlling the injector and the spark plug every two revolutions
of the crankshaft.
The sensor is of the reluctance variation type and is therefore comparable to an alternate current al-
ternator that powers the control unit.
The signal frequency is interrupted by the vacuum generated by the two missing teeth on the wheel
speed sensor.
The sensor signal is fundamental for obtaining starting of the engine.
The CPU autodiagnosis is enabled on this circuit in 2 different ways based on use conditions.
Right after turning to "ON" (Power under the panel present in the CPU), the continuity and isolation of
the sensor and related circuit are checked.
INJEC - 64
CIRCUIT LAYOUT
Specification
Engine rpm sensor
Nexus 500
Desc./Quantity