PIAGGIO Beverly 500 i.e., Workshop Manual

Page: 225 / 382

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 gen-
erator 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 ECU self-diagnosis 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.
Any faults discovered in this phase are signalled via the injection telltale light.
The fault continues to be signalled, but the circuit is only checked when turning to " ON ". Therefore faults
which occur or disappear after turning to " ON " are not acknowledged.
During and after the start phase, the self-diagnosis checks the alternating current produced by the
sensor (synchronisation of the signal panel).
Beverly 500 i.e.
Injection
INJEC - 225