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1F2 -- 80 M161 ENGINE CONTROLS DAEWOO MY_2000 OXYGEN SENSOR YAA1F650 The oxygen sensor is unique among the engine control sensors because is acts like a battery and is able to generate its own low voltage signal. It is located the exhaust system and monitors the amount of oxygen in the exhaust stream and provides feedback to the Engine Control Module (ECM). cool down. oxygen sensor, the ECM compares this reference volt- age with the voltage generated by oxygen sensor. The amount of voltage the oxygen sensor generates is pro- portionate to the difference between the amount of oxy- gen in the outside air and the exhaust gases. The atmosphere contains about 21% oxygen. The exhaust from a rich air/fuel ratio contains almost no oxygen. With a large difference between the amounts of oxygen con- taining the two surface, the sensor generates less volt- age. When the exhaust gas is rich (below 14.7:1), the voltage output is high, above 450 mv. When the exhaust gas is lean (above 14.7:1 air/fuel ratio), the sensor’s voltage output is low, below 450 mv. Open loop / closed loop criteria D Ideal air / fuel ratio YAA1F660 |