Gilera Nexus 500, Workshop Manual, Page: 232 / 406

1 - Select the diagnostic tester menu on the « AC-
TIVE DIAGNOSIS » function.
Select the « PUMP DIAGNOSIS » function.
The pump starts for 30 seconds.
YES go to 2
2 - Let bleed for a few seconds.
Make sure that there are no leaks.
Using pliers with flat and long tips, temporarily
clamp the return duct by the extension of the spe-
cial tool with pump power supply voltage higher
than 12 V, check the system maximum pressure.
Maximum pressure = > 600 KPa (6 BAR)
YES go to 3 NO go to 4
Specific tooling
020480Y Petrol pressure check set
3 - Check the system seal.
Start the pump for 30 seconds using the diagnostic tester.
When the pump stops, wait 3 minutes.
Check the system pressure.
Fuel pressure = over 200 KPa (2 BAR)
YES go to 5 NO go to 6
Specific tooling
020460Y Scooter diagnosis and tester
4 - If pressure is lower, carefully check the voltage
with pump under stress.
If voltage is higher than 12 V, replace the pump.
5 - The system seal is efficient.
Check the free flow rate.
AHEAD go to 16
6 - Repeat the test. When the pump stops, use pli-
ers with flat and long tips to temporarily clamp the
return duct by the extension of the special tool.
This causes an increase of the fuel pressure.
Injection
Nexus 500
INJEC - 40