US Patent 11953895 Fraudulent diagnostic machine detection apparatus

A fraudulent diagnostic machine detection apparatus capable of preventing the occurrence of fraudulent processing due to a fraudulent diagnostic machine being connected in parallel with a legitimate diagnostic machine is a fraudulent diagnostic machine detection apparatus comprising node ECUs of a diagnosis target connected to a communication line and a gateway connected between the communication line and a diagnostic machine connection coupler, wherein the gateway detects an electrical circuit change caused by a pin connection of the diagnostic machine connection coupler being branched and the plurality of diagnostic machines being connected in parallel.