Suzuki 2006 SX4, Service Manual

Page: 226 / 1478

1C-7 Engine Electrical Devices:
Air Fuel Ratio (A/F) Sensor On-Vehicle
Inspection
S6RW0C1306011
Heater
1) Disconnect A/F sensor connector.
2) Using ohmmeter, measure resistance of Sensor
heater between terminals “V
B
” and “GND” at sensor
connector. If found faulty, replace A/F sensor.
NOTE
Temperature of sensor affects resistance
value largely. Make sure that sensor heater is
at correct temperature.
A/F sensor heater resistance
2 – 3
Ω
at 20
°
C (68
°
F)
Viewed from terminal side
3) Connect A/F sensor connector securely.
Heated Oxygen Sensor (HO2S) Heater On-
Vehicle Inspection
S6RW0C1306012
1) Disconnect sensor connector.
2) Using ohmmeter, measure resistance of sensor
heater between terminals “V
B
” and “GND” at sensor
connector.
If found faulty, replace oxygen sensor.
NOTE
Temperature of sensor affects resistance
value largely. Make sure that sensor heater is
at correct temperature.
HO2S heater resistance
5.0 – 6.4
Ω
at 20
°
C (68
°
F)
Viewed from terminal side
3) Connect sensor connector securely.
Air Fuel Ratio (A/F) Sensor, Heated Oxygen
Sensor (HO2S) Removal and Installation
S6RW0C1306013
Removal
WARNING
!
To avoid danger of being burned, do not
touch exhaust system when system is hot. A/
F sensor and/or HO2S removal should be
performed when system is cool.
1) Disconnect negative cable at battery.
2) Disconnect connector of A/F sensor and/or HO2S.
3) Remove A/F sensor (1) and/or HO2S (2) from
exhaust No.1 pipe.
Installation
Reverse removal procedure noting the following.
• Tighten A/F sensor (1) to specified torque.
Tightening torque
A/F sensor (a): 45 N·m (4.5 kgf-m, 32.5 lb-ft)
• Tighten HO2S (2) to specified torque.
Tightening torque
HO2S (b): 45 N·m (4.5 kgf-m, 32.5 lb-ft)
“GND”
“V
B
”
I7RW01130009-02
“GND” “V
B
”
I5JB0A130024-03
1, (a)
2, (b)
I7RW01130010-01