HEATED OXYGEN SENSOR (HO2S) [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5]
id0140g5004700
Purpose/Function
• Detects the oxygen concentration (theoretical air/fuel ratio) in the exhaust gas as basic information (mainly used to determine the fuel injection amount and the deterioration of catalytic converter) and sends it to the PCM as an oxygen concentration (theoretical air/fuel ratio) signal.
Construction
• Installed on the rear side of the exhaust manifold.
• A zirconia element has been adopted (as the detecting element) for detecting the oxygen concentration (theoretical air/fuel ratio).
Operation
• Sends signals, which vary according to the oxygen concentration (air/fuel ratio), to the PCM.
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― When the oxygen concentration in the exhaust gas is high, the output voltage is low because there are almost no difference in the oxygen concentration. (Output voltage approx. 0—0.5 V)
― When the oxygen concentration in the exhaust gas is low, the output voltage is high because the difference in the oxygen concentration is large. (Output voltage approx. 0.5—1.0 V)
HO2S characteristic
Fail-safe
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DTC No.
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Fail-safe function
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P0037:00
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• Stops the fuel feedback control.
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P0038:00
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• Stops the fuel feedback control.
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P0137:00
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• Fixes duty value of A/F sensor heater
• Stops fuel feedback control of A/F sensor
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