VESPA GTS 250 I.E. Workshop Manual page 185

Vespa GTS 250 I.E.
Injection
Check the presence of fixed voltage between the
grey/black cable of the remote control base and
earth. If there is none check the continuity of the
grey/black cable between the fuse box (No. 3 10
A) and the remote control base.
N.B.
CONTINUITY TESTS MUST BE CARRIED OUT
WITH THE COMPONENTS DISCONNECTED.
(REMOTE CONTROLS, CONTROL UNIT,
FUSES ETC.).
pump circuit 6
Check, on switching to "ON", that there is battery
voltage, for about two seconds, to the Black-Green
cable of the pump connector and earth with pump
connector disconnected. Otherwise check the
continuity of the Black-Grey cable between the
pump connector and the base of the remote con-
trol.
Check the efficiency of the earth line of the fuel
pump by measuring the continuity between the
pump connector black cable, system side, and the
earth.
If, when switching to "ON", the pump continues to
turn after two seconds of activation, check, with the
INJEC - 21