PIAGGIO 500 cc Service Manual page 171

Fuel injection
Connect the diagnosis tester 020460Y
(see page 9-17)
Select the "active diagnosis" function on the menu
Select the "injector diagnosis" function.
Activate the function with under-panel feed inserted and the engine stopped.
The control unit commands the fuel pump constantly and at the same time activates opening
of the injector. The injector openings are repeated for a few seconds.
Acoustically check the injector openings and await the tester result.
4 injector openings No injector openings are No injector openings are
are revealed. revealed. revealed.
The fuel injection tester responds The fuel injection tester The fuel injection tester responds
"test completed successfully". responds "test failed". "test completed successfully".
The injector control circuit is The injector control circuit is efficient. Repeat
efficient. Proceed with injector the acoustic check and to be even more certain,
hydraulics control. proceed with the Injector hydraulics control
(see page 9-62)
Select the "ERRORS" function from the menu.
9
Check if only the injector damage is present.
NO
YES NO
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