ISO 15765-4:2016 specifies requirements for Controller Area Networks (CAN) where one or more controllers comply with on-board diagnostics (OBD) or world-wide harmonized on-board diagnostics (WWH‑OBD) regulations. The network presumes the use of an external test equipment for inspection and repair diagnostics, as defined by the regulations. Coalbrookdale Little Wenlock Manual there. ISO 15765-4:2016 specifies requirements for Controller Area Networks (CAN) where one or more controllers comply with on-board diagnostics (OBD) or world-wide harmonized on-board diagnostics (WWH‑OBD) regulations. The network presumes the use of an external test equipment for inspection and repair diagnostics, as defined by the regulations.

I understand that one of the CAN protocol that OBD2 uses to read vehicle data is ISO 15765-4. However this is the one that is used by generic OBD2 reader devices like ScanTool; And it provides a limited set of vehicle parameters (PIDs). Also generic OBD2 readers just provide some fault codes!