“…Various fault diagnosis instruments should be combined with the experimental conclusion, personal experience to judge the fault, else the long-distance driver cannot eliminate the car failure without the guidance of experts. Therefore, fault diagnosis instrument can not be replaced using appropriate methods of analysis automobile fault diagnosis in the future for a long period of time [1]. Automobile fault system always expressed various fault phenomenon, such as fuel supply system common faults often can't start, for the power of the engine, the engine exhaust smoke color is not normal, the engine "coaster" etc.. Usually the fault reason and fault have no relationship: a fault may produce many kinds of failure, a failure may have a variety of reasons.…”