Diagnosis system for motor vehicle

A diagnosis device removably connectable to an electronic control unit installed in a motor vehicle for data communication, the electronic control unit having a communication protocol, the diagnosis device comprising:

• a main processor provided for issuing a command directed to the electronic control unit and processing data transmitted from the electronic control unit in response to the command;
• and
• a sub-processor provided between the main processor and the electronic control unit, the sub-processor being reprogramable so as to make communication between the main processor and the electronic control unit possible under the communication protocol of the electronic control unit,
• wherein the sub-processor has a communication processing program being reprogrammable on board so as to emulate the main processor and the electronic control unit, thereby enabling the diagnosis device to diagnose electronic control units having different communication protocols.

A diagnosis method, comprising:

• connecting a diagnostic device to an electronic control unit installed in a motor vehicle for data communication, the electronic control unit having a communication protocol, the diagnostic device comprising a main processor provided for issuing a command directed to the electronic control unit and processing data transmitted from the electronic control unit in response to the command;
• and a field programmable gate array provided between the main processor and the electronic control unit, the field programmable gate array being reprogrammable so as to make communication between the main processor and the electronic control unit possible under the communication protocol of the electronic control unit, wherein the field programmable gate array is a communication interface with logical functions being reprogrammable on board by transmitted design data to make the communication interface applicable to the communication protocol of the electronic control unit, thereby enabling the diagnosis device to diagnose electronic control units having different communication protocols;
• and
• initiating communication of data between the electronic control unit and the diagnostic device.