PIAGGIO 500 cc Service Manual page 156

Fuel injection
NO
Disconnect the connectors to:
fuel pump, HV coil, injector
Reset harness isolation and
replace the fuse.
9 - 44
Check efficiency of the pump command electromagnetic
switch. Check continuity of the harness between electro-
87 (electromagnetic switch) - green - black (pump) = continuity
Check the earthing isolation of the harness
87 (pump electromagnetic switch) - 23 = isolation (> 1MΩ)
NO
magnetic switch and pump.
Reset and repeat controls from the beginning.
Check the earthing isolation of the HV
coil primary and the injector coil.
See related sections. (page 9-68).
YES
YES
YES