Cagiva Navigator, Workshop Manual

Page: 58 / 407

C.14
INJECTION - AIR INTAKE SYSTEM
ECM (FI CONTROL UNIT)
The ECM unit is situated underneath the seat and the seat compartment towards the rear of the machine.
The ECM consists of a CPU (Central Control Unit), a memory (ROM) and incoming/outgoing sections (I/O).
Signals sent by each sensor are received at the incoming section and then to the CPU. On the basis of the signals
received, the CPU calculates the volume of fuel necessary to start the engine utilising memorised actions prepared
for various engine conditions. The signal for the injection of the fuel is then sent to the injector by the outgoing
section.
The four types of independent programmed action have been memorised in the ROM.
They have been designed to compensate for differences in the intake air/exhaust systems and the performance of
cooling caused by the different leaning angles of the front cylinder and the rear cylinder.
LIGHT LOAD:
When the engine turns under a light load, the volume of fuel injected (time) is based on the
air pressure at the intake air and on the rpm of the engine.
HEAVY LOAD: When the engine turns under a heavy load, the volume of fuel injected (time) is based on
the opening of the throttle and the rpm of the engine.
FRONT CYLINDER
LIGHT LOAD
HEAVY LOAD
REAR CYLINDER
LIGHT LOAD
HEAVY LOAD
INJECTION TIME
INJECTION TIME
INJECTION TIME
INJECTION TIME
AIR PRESSURE
AT THE INTAKE
AIR
AIR PRESSURE
AT THE INTAKE
AIR
ENGINE RPM
ENGINE RPM
ENGINE RPM
ENGINE RPM
OPENING OF
THE THROTTLE
OPENING OF
THE THROTTLE