PIAGGIO 633823 Service Station Manual page 179

MP3 250 i.e.
Injection
With the control unit and the injector disconnected,
check the continuity of the Red-Yellow cable be-
tween pin 14 of the interface wiring and the injector
connector
Switch to "ON" and check if there is voltage, with
injector disconnected and control unit connected,
between the Black-Green cable of the injector con-
nector and the ground lead
With injector disconnected and the injector load
remote control disconnected, check the continuity
of the Black-Green cable between the injector con-
nector and remote control base.
INJEC - 27