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With the development of the electronics, the electronic controlling technologies are widely used in many parts of automobiles. Since the rules for emission and fuel consumption are becoming more and more strict, the traditional engines with carburetors can not meet the requirements any longer, and are being replaced by the engines with the electronic control system which comes up with the diagnostic problems. The traditional trouble concepts, serving and diagnostication are out of date. According to the need in the development of the electronic controlled motorcycle, a set of diagnosis instrument has been developed to increases the analytic reliability and accuracy.The diagnosis system adopts blocking design, consisting of six parts: main control model, display model, operating model, communication model, modem model, and telephone interface model. It makes some function extend and capability optimize to become better than the primary diagnosis instrument. In local diagnosis, the diagnosis system can monitor the condition of the engine, modify the ECU parameters, optimize the engine management system under the idle condition, identify ECU information, benchmark information, parameter of the engines with the electronic control system. In remote diagnosis, the Fax modem CX86810 take the place of the Fax modem R96DFCX.It has powerful function such as high transmitting rate up to 14.4kpbs, predominate adaptability on PSTN, more reliable during the data transmitting. It has been proved by experiment that it can complete the information transmit from/to ECU. It can also meet the FAI motorcycle optimizing and ordinary maintenance.The system can realize the real-time on-line diagnosis for EFI engines, reducing the diagnostic cost and making the fault-diagnosis more quick and convenient. With the diagnosis system , the collection of the experiment data become more convenient, and the service after market is improved. They are very useful for client to reduce doubt of using FAI motorcycle. They are also very useful for the development of the FAI motorcycle.
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