Grand Vitara 4WD L4-2.4L (2009)
Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensor (HO2S) On-Vehicle Inspection
HO2S (Heated Oxygen Sensor) On-Vehicle Inspection
HO2S
1. Check that HO2S signal is output properly.
If faulty condition is found, check the following.
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Wire harness and connections
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Exhaust system leakage
If check results are satisfactory, replace HO2S.
HO2S heater
1. Turn off ignition switch and disconnect HO2S connector.
2. Check that voltage of HO2S connector (vehicle side) between terminals "4" and "3" is battery voltage when ignition switch is in ON position.
If faulty condition is found, check power supply circuit, ground circuit and connections.
3. Using ohmmeter, measure resistance of HO2S connector (sensor side) of sensor heater between terminals "3" and "4" at sensor connector. If faulty
condition is found, replace HO2S.
NOTE: Sensor temperature affects resistance value largely. Make sure that sensor heater is at specified temperature.
HO2S heater resistance
5.0 - 6.4 ohms at 20 °C (68 °F)