Montero SR 4WD V6-3.5L SOHC (1997)
Oxygen Sensor: Description and Operation
Federal
OPERATION
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The heated oxygen sensor functions to detect the concentration of oxygen in the exhaust gas; it converts those data to voltage, and in puts the
resulting signals to the engine control module.
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If the air/fuel mixture ratio is richer than the theoretical air/fuel mixture ratio (i.e., if the concentration of oxygen in the exhaust gas is low), a
voltage of approximately 1 V is output; if the air/fuel mixture ratio in leaner than the theoretical air/fuel mixture ratio (i.e., if the concentration is
dense), a voltage of approximately 0 V is output.
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The engine control module, based upon those signals, regulates the amount of fuel injection so that the air/fuel mixture ratio becomes the
theoretical air/fuel mixture ratio.
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Battery positive voltage is supplied, by way of the MFI relay, to the heated oxygen sensor heater. As a result, the sensor element is heated by the
heater, so that the heated oxygen sensor shows excellent response even if the temperature of the exhaust gas is low.
