Mirage L4-1597cc 1.6L SOHC Turbo (1985)
Oxygen Sensor: Description and Operation
Fig. 28 Oxygen sensor.
An oxygen sensor, Fig. 28 is used to sample the exhaust stream and permit adjustment of the fuel-air ratio by the ECU to achieve stoichiometric
combustion. 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. 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.
