| 摘要 |
PROBLEM TO BE SOLVED: To provide a diagnosis device capable of diagnosing air fuel ratio sensor in ordinary air fuel ratio feed back control without using air fuel ratio control for diagnosis requiring adjustment man-hour. SOLUTION: Deviation of air fuel ratio is integrated for a predetermined time after detected air fuel ratio crosses target air fuel ratio when deviation of the detected air fuel ratio by an air fuel ratio sensor is a predetermined value or greater at a time of re-start of fuel supply after fuel cut. If integration of the air fuel ratio deviation is the predetermined value or greater, response deterioration of the air fuel ratio sensor is determined. If integration of the air fuel ratio deviation is less than the predetermined value, the air fuel ratio sensor is determined as normal. COPYRIGHT: (C)2006,JPO&NCIPI
|
