4. Fuel Injection System
4-10
O
2
Sensor
Function:
O
2
Sensor measures the proportion of oxygen in the exhaust gas, sending signals to ECU which adjusts
the air-fuel ratio by changing the fuel injection time. If the proportion of oxygen is too low, it means the rich
air-fuel mixture with higher HC & CO concentration in the exhaust gas. If the proportion of oxygen is too
high, it means the lean air-fuel mixture with higher temperature and higher NOx concentration.
1.
O
2
Sensor outputs feedback signal to ECU which keeps the air-fuel mixture near the stoichometric ratio
approximately 14.6 and forms the closed loop control system.
2.
When the air-fuel mixture is near the stoichometic ratio, CO / HC / NOx are converted most efficiently.
3.
O
2
Sensor heater resistance: 6.7 ~ 10.5 Ω
4.
O
2
Sensor amendment in the voltage value: between 100 ~ 900 mV
O
2
Sensor
O
u
tp
u
t
v
o
lt
a
g
e
Rich ← 14.7 → Lean
1.
Ceramic tube
2.
Electrode
3.
Exhaust gas
4.
Atmosphere
3
1
2
4
ECU
Battery
Power relay
To this chapter contents
O
2
Sensor
Summary of Contents for Citycom.300i
Page 5: ...Serial Number Home page Contents...
Page 38: ...2 Maintenance Information 2 17 Note To this chapter contents...
Page 46: ...3 LUBRICATION SYSTEM 3 8 Notes To this chapter contents...
Page 106: ...4 Fuel Injection System 4 60 Note To this chapter contents...
Page 173: ...10 AC Generator Starting Clutch 10 10 Notes To this chapter contents...
Page 195: ...12 Cooling System 12 14 Notes To this chapter contents...
Page 223: ...14 Brake System 14 12 Note To this chapter contents...
Page 244: ...17 Electrical System 17 5 FUSE Fuse circuit diagram To this chapter contents...
Page 262: ...17 Electrical System 17 23 Note To this chapter contents...
Page 270: ...19 Electrical Diagram 19 1 Home page Contents LH30W EFi Electrical Diagram 19...
