Vehicle diagnostic system

Abstract

An object of the present invention is to provide a diagnostic server that can easily diagnose whether an abnormality occurring in a vehicle is a result of an attack or simply a malfunction. A diagnostic server 1 of the present invention includes a log acquisition unit 13 that acquires a history of a first log indicating whether an ECU 32 in a vehicle 3 executes predetermined processing in response to a request signal that requests the ECU 32 to execute the predetermined processing, and a communication determination unit 15 that, when a non-execution log indicating that the predetermined processing is not executed is included in the history, determines validity of communication used to transmit the request signal corresponding to the non-execution log.

Dependencies are inferred from the claim text.