System components
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12 -System components
Electronic Control Unit (ECU)
The engine ECU (1) is an electronic digital microprocessor-based unit.
It controls both the injectors and the coils, thus controlling fuel injection and ignition in accordance with the engine
operating conditions detected by the following sensors:
-Absolute pressure sensor (measures barometric pressure and engine load in Speed Density mode)
-Air temperature sensor (measures intake air temperature)
-Engine temperature sensor (measures the engine temperature)
-Timing/rpm sensor for engine rotation speed and the position of each cylinder relative to TDC
-Throttle position sensor (measures the throttle opening angle)
The ECU also monitors battery voltage so that it can adjust injector opening time and ignition coil charging time
accordingly.
The ECU determines the following values:
-Amount of fuel delivered to each cylinder with a sequential non-parallel control
-Injector closing time and therefore injection timing relative to the end of the induction stroke for each cylinder
-Ignition advance.
Important
The maps, which include 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 in the Flash Eprom of the ECU.
The above values are preset by the Manufacturer after testing the motorcycle under different riding conditions.
These settings cannot be changed.
Removal of the electronic control unit
To remove the ECU (1) it is necessary to remove the fuel tank (Sect. 8 - 2,
Removal of the fuel tank), disconnect ECU
connector (2) and undo the retaining screws (3).
Refitting the electronic control unit
Fix the ECU (1) to the airbox with the fours screws (3) and reconnect the wiring connector (2).
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