Gilera 633721 Workshop Manual page 204

Injection
Specific tooling
020460Y Scooter diagnosis and tester
1 - Check whether the immobilizer system LED in-
dicates switching to "ON"
YES go to 2 NO go to 4
2 - Raise the side stand. Set the emergency switch
to "OFF". Turn the key switch to "ON". Set the
emergency switch to "RUN". Check whether the
injection telltale light turns on for 5 seconds
YES go to 3 NO go to 4
3 - Continuous power supplies are regular
4 - Check the function of fuse No. 8, check the function of the engine stop remote control.
YES go to 5 NO go to 6
5 - Place the special tool between control unit and injection system.
YES go to 7
Specific tooling
020481Y Control unit interface wiring
6 - Fix any short circuits and replace the fuse.
Check decoder and control unit, if necessary
YES go to 1
7 - Disconnect the main decoder connector and
check the following conditions: switch set to "ON",
switch to "RUN" and side stand raised
Terminal no. 8 = battery positive
Terminal no. 4= battery negative
YES go to 8 NO go to 10
8 - Decoder with proper continuous power supply.
Use the special tool to check the control unit con-
tinuous power supply. Switch set to "ON", switch
to "RUN" and side stand raised.
Pin 26 = battery positive
Pin 23 = battery negative
YES go to 9 NO go to 10
Specific tooling
020481Y Control unit interface wiring
INJEC - 204
Nexus 500 euro 3