Rodeo S 2WD L4-2.2L (1999)
Oxygen Sensor: Description and Operation
Fuel Control Heated Oxygen Sensors
Fuel Control Heated Oxygen Sensor (Pre-Catalyst)
The fuel control heated oxygen sensor (Bank 1 HO2S 1) is mounted in the exhaust stream where it can monitor the oxygen content of the exhaust gas.
The oxygen present in the exhaust gas reacts with the sensor to produce a voltage output. This voltage should constantly fluctuate from approximately
100 mV to 900 mV.
The heated oxygen sensor voltage can be monitored with a Scan Tool. By monitoring the voltage output of the oxygen sensor, the PCM calculates the
pulse width command for the injectors to produce the proper combustion chamber mixture.
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Low HO2S voltage is a lean mixture which will result in a rich command to compensate.
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High HO2S voltage is a rich mixture which will result in a lean command to compensate.
