Whole-automobile diagnosing method

The invention relates to a whole-automobile diagnosing method, which can complete the whole-automobile diagnosis and simultaneously realize the software upgrading and on-line configuration of an electric control unit. The technical scheme is that: the whole-automobile diagnosing method involves a whole-automobile CAN diagnosing communication network, all electric control units of the automobile are nodes of the diagnosing communication network, and external diagnosing test equipment is connected with an interface of the whole-automobile CAN diagnosing communication network and diagnoses the whole automobile; and the whole-automobile diagnosing method is characterized in that the diagnosing test equipment can upgrade software of controllers of the electric control units, and also write configuration information in a gateway of the whole-automobile CAN diagnosing communication network to realize the on-line configuration of the electric control units.