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EAS20008
FEATURES
EAS30005
OUTLINE OF THE FI SYSTEM
The main function of a fuel supply system is to provide fuel to the combustion chamber at the optimum
air-fuel ratio in accordance with the engine operating conditions. In a conventional carburetor system,
the air-fuel ratio of the mixture that is supplied to the combustion chamber is created by the volume of
the intake air and the fuel that is metered by the jet used in the respective chamber. Despite the same
volume of intake air, the fuel volume requirement varies with the engine operating conditions, such as
acceleration, deceleration, or operation under a heavy load. Carburetors that meter the fuel through the
use of jets have been provided with various auxiliary devices, so that an optimum air-fuel ratio can be
achieved to accommodate the constant changes in the operating conditions of the engine.
As the requirements for engines to deliver more performance and cleaner exhaust gases increase, it
becomes necessary to control the air-fuel ratio in a more precise and finely tuned manner. To accom-
modate this need, this model has adopted an electronically controlled fuel injection (FI) system in place
of a conventional carburetor system. This system can achieve an optimum air-fuel ratio required by the
engine at all times by using a microprocessor that regulates the fuel injection volume according to the
engine operating conditions detected by various sensors.
Adoption of the FI system has resulted in a highly precise fuel supply, improved engine response, better
fuel economy, and reduced exhaust emissions.
1. Fuel injector
2. Lean angle sensor
3. ECU (engine control unit)
4. Intake air temperature sensor
5. Engine trouble warning light
6. Battery
7. Intake air pressure sensor
8. Fuel hose
9. O
sensor
2
10. Fuel pump
11. Crankshaft position sensor
12. Fuel tank
13. Coolant temperature sensor
14. Throttle position sensor
17
1-2
15. Spark plug
16. Ignition coil
17. Speed sensor
FEATURES
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