Посмотрел сейчас - кроме ISO 9141 никакой протокол не может быть, т.к. все остальные протоколы были изобретены позже, чем мой авто (Mazda Familia 1998)
ISO 9141: Road vehicles — Diagnostic systems. International Organization for Standardization, 1989.
ISO 11898: Road vehicles — Controller area network (CAN). International Organization for Standardization, 2003.
ISO 14230: Road vehicles — Diagnostic systems — Keyword Protocol 2000, International Organization for Standardization, 1999.
ISO 15031: Communication between vehicle and external equipment for emissions-related diagnostics, International Organization for Standardization, 2010.
ISO 15765: Road vehicles — Diagnostics on Controller Area Networks (CAN). International Organization for Standardization, 2004.