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Electronic control unit
The engine control unit (1) is an electronic digital microprocessor-based unit.
The ECU control unit (1) 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 the barometric pressure);
- air temperature sensor (measures intake air temperature);
- engine temperature sensor (measures the coolant 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:
- quantity of fuel delivered to each cylinder;
- injector closing time and therefore injection timing relative to the end of the intake stroke for each
cylinder;
- spark advance.
Important
The maps, which include spark 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/REASSEMBLY
Remove the seat
(Removing the
seat)
Disconnect connector (2) of the control unit (1). Remove the control unit (1) by sliding it off pins (3).
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