However when the vehicles are being developed we dont use factory tools for many reasons but mainly its because we have a read/write need. On top of this the factory tools have the abilty to run standardized protocols to aid diagnostics. This is where the factory tool has the upper hand, access to the database. This "dictionary" of translations is an extensive database file which is produced by the OEM. This interpretation of the raw CAN message is then translated into an easily read explanation. Every scan tool (to a point) simply gathers CAN messages and displays them in a fashion other than digits. There is nothing mystical about factory scan tools and their capability.
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