| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fault diagnosis method, a fault diagnosis system and a fault diagnosis device for an engine, capable of reducing the man-hours greatly for specifying or confirming fault portions as causes of misfire. <P>SOLUTION: In the fault diagnosis method and the fault diagnosis system 10 for the engine 16, an external diagnosis device 14: obtains continuous data on the incidences of misfire by misfiring cylinders from a vehicle 12 side with regard to the actually occurring misfire or past incidences of misfire; detects a misfire pattern, which is to be classified according to the presence of continuous incidences of misfire, on the basis of the continuous data; and narrows down fault portions in accordance with the misfire pattern. <P>COPYRIGHT: (C)2013,JPO&INPIT |
