XG 350 V6-3.5L (2002)
2. If the HO2S check results are normal, but the sensor output voltage is out of specification, check for the following items (related to air fuel ratio
control system):
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Defective injector
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Air leaks in the intake manifold
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Defective volume air flow sensor, intake air temperature sensor, barometric pressure sensor and engine coolant temperature sensor.
INSPECTION
NOTE:
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Before checking, warm up the engine until the engine coolant temperature reaches 80 to 95 °C (176 to 205 °F)
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Use an accurate digital voltmeter.
1. Disconnect the oxygen sensor connector, and measure the resistance between terminal 3 and terminal 4.
Standard value
2. Replace the oxygen sensor if there is a malfunction.
3. Apply battery voltage directly between terminal 3 and terminal 4.
NOTE: Be careful when applying the voltage. Damage will result if terminals 1 and 2 are connected to any voltage.
4. Connect a high-impedance digital-type voltmeter between terminal 1 and terminal 2.