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This document is here to collect everything we can find about OBD-II, it's various interfaces, protocols and layers.

OBD-II is a standard for vehicle diagnostics relating to emissions implemented on all US vehicles since the mid 1990s. Europe has just introduced a standard called EOBD which is basically the same.

• A list of the interfaces that we velieve ScanTool will support.
• A diagram that describes the OBD-II protocols various component layers and sub-specifications.
• Another diagram of the OBD-II layers.
• More information about interface support.
• Documentation of the pinout of the OBD-II connector - along with which pins each sub-protocol supports.
• A Description of the OSI seven layer interconnect model on which freediag's implementation rests.
• How to know whether your car fully supports OBD.
• A list of results obtained with various cars, various interface cables and various versions of scantool.