The Nissan Consult interface is pretty cool, and even cooler is all the diagnostic functionality provided… there are provisions for all sorts of automated tests, and even better, the data is out in the public, rather than hidden away. Unlike ODB-II, Consult albeit older provides for actual diagnostics and the ability to change values, rather than just monitor them. It however is for older vehicles… new ones likely use a totally different protocol, maybe even running over ODBII and can.

Some useful links

DIY Consult protocols and register tables

Consult Schematic for a DIY interface

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