VESPA GTS Super 300 ie 2008 Service Station Manual page 196

Injection
pump circuit6
Check, on switching to "ON", that there is battery
voltage, for about two seconds, to the Black-Green
cable of the pump connector and ground with
pump connector disconnected. Otherwise, check
the continuity of the Black-Green cable between
the pump connector and the remote control base.
Check the efficiency of the ground line of the fuel
pump by measuring the continuity between the
pump connector black cable, system side, and the
ground.
If, when switching to "ON", the pump continues to
turn after two seconds of activation, check, with the
control unit disconnected and the injection load re-
mote control disconnected, that the Black-Purple
cable (pin 20 on the interface wiring) is insulated
from the ground.
Specific tooling
020331Y Digital multimeter
Circuit leak test
Install the specific tool for checking the fuel pressure, with the pipe fitted with the gauge.
INJEC - 196
Vespa GTS Super 300 ie (2008)