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Heating circuit operating state diagnosing method for lambda sensor in motor vehicle, involves carrying out final diagnosis of heating circuit of oxygen sensor relative to result of preliminary diagnoses of operation of heating circuit
Heating circuit operating state diagnosing method for lambda sensor in motor vehicle, involves carrying out final diagnosis of heating circuit of oxygen sensor relative to result of preliminary diagnoses of operation of heating circuit
The method involves calculating an average value of heating current of an oxygen sensor during a predetermined duration i.e. elementary time-window. The average value of the heating current is compared to a threshold value for carrying out preliminary diagnosis of operation of a heating circuit of the oxygen sensor during the elementary time-window. The calculation and the comparison of the average value are repeated for a predetermined number of times. Final diagnosis of the heating circuit is carried out relative to result of the preliminary diagnoses. An independent claim is also included for a device for diagnosing an operating state of a heating circuit of an oxygen sensor.
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