System diagnosis method and diagnosis system based on extended DT log

The invention discloses a system diagnosis method and system based on an extended DT log, and the method comprises the steps: carrying out the coding according to a preset coding rule, obtaining a DT log, and obtaining the DT log stored at a vehicle end; calling a DT scene corresponding table, wherein the DT scene corresponding table is a preset corresponding relation between codes and scenes; the DT log is parsed in a segmented mode, the content of the DT log is segmented into multiple segments of content according to the DT scene corresponding table, and text information corresponding to the DT log is determined. According to the method, the DT log is coded through the preset coding rule, and the DT log can be decoded and the diagnosis text in a fixed format can be output in combination with the DT scene corresponding table, so that the customer service personnel can conveniently trace the problem of the vehicle machine; based on the scheme of the invention, more diagnosis information can be obtained, the m