| Along with the development of electronic technology, the engine with electronic control system has become more and more complex. As a result, the maintenance and repair of the vehicle meet more difficulties. So, the engine diagnosis technology has become a hot research point. According to the need in the development of the electronic controlled motorcycle, a set of diagnosis instrument has been developed, including a portable diagnosis instrument and a set of remote diagnosis system.The portable diagnosis instrument is based on the embedded system, consisting of six parts: main control model, display model, operating model, communication model, modem model, and telephone interface model. The portable diagnosis instrument can be used for local diagnosis and remote diagnosis. In local diagnosis, the diagnosis instrument can monitor the condition of the engine, modify the ECU parameters, and optimize the engine management system under the idle condition. In remote diagnosis, the portable diagnosis instrument, the server device, together with the public switched telephone network makes up the remote diagnosis system.With the diagnosis system, the diagnosis center can monitor the FAI motorcycle of client and make a remote failure diagnosis. The remote diagnosis system uses the PSTN to transmit data based on the Fax theory. Before transmitting, the digital signal should be transformed into analog signal, which is suit for transmitting in PSTN. When received, the signal should be demodulated back to the orient signal. In the system, the Fax modem R96DFX is used. The system uses the different transmitting rate for data and order. Besides, the center can communicate with the client in voice using the system.With the portable diagnosis instrument and the remote diagnosis system, the collection of the experiment data become more convenient, and the service after market is improved. They are very useful for the development of the FAI motorcycle.
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