Engine Coolant Temperature (Ect) Sensor Inspection; Heated Oxygen Sensor (Ho2S-1 And Ho2S-2) Heater On-Vehicle Inspection (If Equipped); Heated Oxygen Sensor (Ho2S-1 And Ho2S-2) Removal And Installation (If Equipped) - Suzuki SX4 Service Manual

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1C-7 Engine Electrical Devices:
Engine Coolant Temperature (ECT) Sensor
Immerse temperature sensing part of ECT sensor (1) in
water (or ice) and measure resistance between sensor
terminals while heating water gradually.
If measured resistance doesn't show such characteristic
as shown, replace ECT sensor.
Heated Oxygen Sensor (HO2S-1 and HO2S-2)
Heater On-Vehicle Inspection (If Equipped)
1) Disconnect sensor connector.
2) Using ohmmeter, measure resistance between
terminals "V
If found faulty, replace oxygen sensor.
Temperature of sensor affects resistance
value largely. Make sure that sensor heater is
at correct temperature.
Resistance of oxygen sensor heater
HO2S-1: 5.0 – 6.4 Ω at 20 °C (68 °F)
HO2S-2: 11.7 – 14.5 Ω at 20 °C (68 °F)
[A]: HO2S-1
3) Connect sensor connector securely.
Heated Oxygen Sensor (HO2S-1 and HO2S-2)
Removal and Installation (If Equipped)
To avoid danger of being burned, do not
touch exhaust system when system is hot.
Oxygen sensor removal should be performed
when system is cool.
1) Disconnect negative cable at battery.
2) Disconnect connector of heated oxygen sensor and
release its wire harness from clamps.
3) Perform following items before removing heated
oxygen sensor.
a) For HO2S-1, remove exhaust manifold referring
b) For HO2S-2, hoist vehicle.
4) Remove heated oxygen sensor from exhaust pipe or
exhaust manifold.
" and "GND" of sensor connector.
Viewed from terminal side
[B]: HO2S-2
to "Exhaust Manifold Removal and Installation in
Section 1K", if necessary.


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