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IMPIANTO ELETTRICO, STRUMENTO DIGITALE, IMPIANTO INIEZIONE CARBURANTE
ELCTRIC SYSTEM, DIGITAL INSTRUMENT, FUEL INJECTION SYSTEM
INSTALLATION ÉLECTRIQUE, INSTRUMENT DIGITAL, SYSTÈME DE INJECTION CARBURANT
ELEKTRISCHE ANLAGE, DIGITAL INSTRUMENTE, EINSPRITZUNG ANLAGE
SISTEMA ELÉCTRICO, INSTRUMENTO DIGITAL, SISTEMA INYECCIÓN GASOLINA
FUEL INJECTION SYSTEM
The fuel injection system consists of: fuel tank (1), electric pump (2), hoses (3) and
injector (4). The fuel in the tank is pumped by the fuel pump and the pressurized fuel
flows into the injector installed in the throttle body (6). The fuel is injected into the throttle
body with a conical dispersion when the injector opens according to the injection signal
coming from the Electronic power unit (ECU:5) located under the saddle.
The items to be considered for the correct output of the fuel in every condition of use
of the vehicle are the followings:
- Air temperature in the intake manifold;
- Engine coolant temperature;
- Atmospheric pressure in the intake manifold (in the current position and altitude);
- Throttle opening percentage;
- SM 610: Vehicle rollover;
- Rich or lean combustion mixture (O2 sensor);
- Battery voltage;
- Sensors source;
- Current gear position;
- Pulse width of fuel injector;
- Ignition coil;
- O2 heater.
The diagnostic software "DIAGNOSIS SOFTWARE KIT" (see on page M.76) allows the
check of the above mentioned parts in case of fuel injection system malfunction.
The electric pump (2) is assembled in the bottom of the fuel tank (1) and consists of
rotor, magnet, impeller, brushes, control valve and relief valve. The ECU (5) checks ON/
OFF condition of the pump.
In order to remove the fuel pump, first it is necessary to remove the fuel tank as shown
on page E.7, then remove the six fastening screws (a); for the reassembly, reverse the
above mentioned operations (for the fuel pump check, please see page M.84).
M.72
a- Fuel pump fastening
screw
b- Delivery union
c- Backflow union
d- Pump filter
e- Fuel filter
Part. N. 8000 A7918 (02-2007)
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