Gilera 633721 Workshop Manual page 216

Injection
- If the rpm-timing signal is received. Continuous supply.
The initial timing is useful to bleed the system especially after a stop with engine in temperature. In
these conditions, the fuel altered by boiling will be mixed with that in the tank.
During use, the pump operation will be subject to the engine speed.
Circuit check
Proceed as follows:
1 - Set the switch to "ON" with emergency switch to "RUN" and side stand raised. The pump rotates for
2 seconds.
YES go to 2 NO go to 3
2 - Try to start up. Check that the engine speed matches the pump rotation.
YES go to 4 NO go to 5
3 - The pump does not rotate, or it rotates uninterruptedly.
YES go to 5
4 - The pump power supply is conforming.
5 - Connect the diagnostic tester to the scooter system.
YES go to 6
Specific tooling
020460Y Scooter diagnosis and tester
6 - Try to start up. Select the function "ERRORS"
in the menu. Check whether there are any failures.
YES go to 7 YES go to 8 NO go to 28
7 - Pump control relay circuit failure.
YES go to 9
8 - Failure of:
- injector
- H.V. coil
- Signals panel
YES go to 18
9 - The control unit has detected a failure on the line of pin 19
YES go to 10 YES go to 11
INJEC - 216
Nexus 500 euro 3