PIAGGIO 500 cc Service Manual page 116

Fuel injection
The control unit has its own auto-diagnosis system
connected to an indicator on the instrument panel.
Anomalies may be discovered and cancelled with a
020460Y diagnosis tester.
In any event, when the anomaly is no longer present, its
memorization is automatically cancelled after 16 usage
cycles (cold start, warm running, stopping).
The diagnosis tester is also indispensible for idling
carburation regulation.
The EMS igntion-injection system carries out the func-
tion of revolution counter control and electrical fan
control for cooling of the radiator.
The EMS control unit is connected to the decoder of the
anti-theft immobilizer system.
The decoder is in turn connected to a diagnosis LED
that also functions as a blinking deterrent light.
Feed of the EMS control unit is further controlled by the
emergency switch and the side stand deviator; thus
guaranteeing more vehicle safety.
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