| 摘要 |
In the diagnosing process in which a target air-fuel ratio in an air-fuel ratio feedback control is forcibly changed, and based on a response time of detection signal from an air-fuel ratio sensor to the change, a response characteristic of the air-fuel ratio sensor is diagnosed, when the diagnosis is finished, an air-fuel ratio feedback control signal is returned in stepwise to a value in just before the starting of diagnosis.
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