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Fuel injection-ignition system components
3 - Fuel injection-ignition system components
Electronic control unit
Engine ECU (1) is an electronic digital microprocessor-based unit.
It controls both injectors and coils, thus controlling injection and ignition depending on engine
operating conditions as detected by the following sensors.
- Absolute pressure sensor for atmospheric pressure
- Air temperature sensor for temperature of intake air
- Engine temperature sensor for engine oil temperature
- Timing/rpm sensor for engine rotation speed and cylinder timing to TDC
- Throttle position sensor for throttle opening angle
Moreover, the engine control unit monitors battery voltage to adjust injector opening time and ignition
coil charging time.
The electronic control unit determines the following values.
- Fuel amount delivered to each cylinder according to a timed sequence
Closing time of injectors and therefore injection timing referred to the end of intake stage for each
-
cylinder
- Ignition advance
Caution
Mapping including ignition advance values, injection times, crankshaft angle for injector closing and all
correction curves as a function of temperature and atmospheric pressure values are stored into the
ECU Flash Eprom. The above values are preset by the Manufacturer after testing the motorcycle under
different riding conditions.
Settings cannot be changed.
Removing the electronic control unit
To remove the control unit, remove the fuel tank (Sect. L 2,
two control unit connectors (1) and (2), unscrew the retaining screws (3) and detach the control unit
ground cable (4) from the screw (3).
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Removing the fuel
tank), disconnect the
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