Eclipse L4-1997cc 2.0L DOHC (1991)
Catalytic Converter Performance
The difference in the amount of oxygen contacting the inner and outer surfaces of the oxygen sensor creates a pressure differential which results in a
Voltage signal being generated. The amount of Voltage produced is determined by the air/fuel mixture. Voltage output from the Oxygen Sensor is about
0.9 Volts DC when the fuel air mixture is richer than stoichiometric and about 0.1 Volts DC when the mixture is leaner than stoichiometric with a sharp
Voltage transition from high to low at the stoichiometric point.
Oxygen Sensor Voltage vs Fuel/Air Ratio
The ECU's instant mixture adjustment in response to the Voltage output of the oxygen sensor causes the output Voltage from the Oxygen Sensor to
fluctuate rapidly between 0.1 and 0.9 Volts DC and will be observed as an average of about 0.6 Volts DC when measured with a Voltmeter.
