PIAGGIO 500 cc Service Manual page 196

Fuel injection
Select the "parameters" function from the
diagnosis tester menu.
Check if the control unit recognizes the
extreme positions:
throttle valve to minimum
throttle valve to maximum
YES
Gradually open the throttle valve,
Increases gradually in proportion to opening variations.
The TPS conforms.
Connect the special tool 020481Y to the fuel
injection system. See page 9-8.
Do not connect the tool to the control unit.
9 - 84
Check regulation of the throttle command flexible
transmissions.
check that mV indication
YES
NO
NO
NO
Reset or replace.
NO YES
YES