| 摘要 |
An apparatus for failure diagnosis of an intake air flow sensor is provided which, when the operating state of an engine is judged to be in a low flow rate region, determines whether or not the intake air flow rate detected by the intake air flow sensor is excessively high relative to a theoretical intake air flow rate corresponding to the operating state of the engine and, if the detected intake air flow rate is excessively high, judges that the intake air flow sensor has failed. Also, when the operating state of the engine is judged to be in a high flow rate region, the apparatus for failure diagnosis determines whether or not the detected intake air flow rate is excessively low relative to the theoretical intake air flow rate and, if the detected intake air flow rate is excessively low, judges that the intake air flow sensor has failed.
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