PIAGGIO MP3 400 i.e. Service Manual page 222

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.
Inspecting the injector hydraulics
To check the injector, remove the inlet manifold by
removing the three fixing screws at the head and
the three screws connecting the control unit to the
manifold.
INJEC - 26
MP3 400 i.e.