Ecm (Fi Control Unit) - Suzuki GSX-R750 Service Manual

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4-14 FI SYSTEM AND INTAKE AIR SYSTEM

ECM (FI CONTROL UNIT)

The ECM is located under the seat.

The ECM consists of CPU (Central Processing Unit), memory (ROM) and I/O (Input/Output) sections. The signal

from each sensor is sent to the input section and then sent to CPU. On the basis of signal information received,

CPU calculates the volume of fuel necessary for injection using maps programmed for varying engine conditions.

Then, the operation signal of the fuel injection is sent from the output section to the fuel injector.

The eight kinds of independent program maps are programmed

These eight kinds of maps are designed to compensate for differ-

ences of the intake/exhaust systems and cooling performance.

LIGHT LOAD: When the engine is running in a light load, the fuel

injected volume (time) is determined the basis of

the intake air pressure and engine speed.

HEAVY LOAD: When the engine is running in a heavy load, the

fuel injected volume (time) is determined the basis

of the throttle valve opening and engine speed.

ENGINE r/min

ENGINE r/min

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