4. Fuel Injection System
4-5
Fuel System
System Description
1.
After Key-on, the sensors signal to be sent to the ECU. ECU controls the fuel pump relay to make the
fuel pump operate. If the engine is not started, the fuel pump will be shut down within 2 to 3 seconds in
order to save electricity.
Fuel pressure regulator maintains fuel pressure at 294 ± 6kPa (about 3 kg / cm²). According to the
operating conditions and environmental compensation coefficient, appropriate fuel will be injected. After
Key-off or engine stopped operating, the fuel pump stops running.
2.
Fuel impurities filtered by the fuel filter should be cleaned regularly.
3.
When the engine can not be started, do not keep start motor running continuously which may lead to
lack of battery power (less than 10 V) and the fuel pump will not be able to operate. The correct way is
to use a new battery.
Injector
Eight-hole type injector provides two intake valves fuel injection quantity, enhances the effect of fuel
atomization, and reduces HC emissions. Short-type injector cap can easily fix the injector, receive the fuel
from the fuel pump, and limit injector rotation sliding. The signals from ECU control the fuel pressure
regulator, using the diaphragm and spring to maintain the fuel pressure in 294 ± 6kPa (about 3 kg / cm²),
and determine the fuel injection quantity by adjusting injection time width under different engine
conditions.
Fuel Pump
Electrical fuel pump is placed inside the fuel tank, powered by the battery and controlled by ECU.
Fuel pressure: 294 ± 6kPa (about 3 kg / cm²)
Injector
Fuel pump
Fuel pump
relay
ECU
Battery
Power relay
To this chapter contents
Summary of Contents for MAXSYM 400i
Page 23: ...1 General Information 1 18 NOTE To this chapter contents...
Page 75: ...4 Fuel Injection System 4 30 EFi System Circuit To this chapter contents...
Page 104: ...4 Fuel Injection System 4 59...
Page 109: ...5 ENGINE REMOVAL 5 5...
Page 132: ...7 Cylinder Piston 7 7...
Page 136: ...7 Cylinder Piston 7 11 NOTE To this chapter contents...
Page 171: ...11 Crankshaft Crankcase 11 8 NOTE To this chapter contents...
Page 183: ...12 Cooling System 12 12 NOTE To this chapter contents...
Page 199: ...13 Body Cover 13 16 NOTE To this chapter contents...
Page 219: ...14 Brake System 14 20 NOTE...
Page 231: ...14 Brake System 14 12 NOTE To this chapter contents...
Page 253: ...17 Electrical System 17 5 Fuse Fuse circuit diagram To this chapter contents...
Page 270: ...17 Electrical System 17 22 NOTE To this chapter contents...
Page 271: ...18 Wiring Diagram 18 1 18 Homepage Contents...
Page 272: ...18 Wiring Diagram 18 2...
Page 273: ...18 Wiring Diagram 18 3...
Page 274: ...18 Wiring Diagram 18 4 NOTE Homepage Contents...