Tag
#protocol
3 posts in Car Diagnostics blog about "protocol" — OBD-II diagnostics, DTC codes, repair. ← All posts
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DoIP: diagnostics over Ethernet and what it means for OBD dongles
Newer vehicles move diagnostics onto automotive Ethernet for speed. The generic OBD-II data you rely on still works — what changes is everything beyond it.
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ISO-TP (ISO 15765-2): how long diagnostic messages travel on CAN
A CAN frame carries eight bytes. A VIN is seventeen. ISO-TP is the layer that solves that, and understanding it explains several otherwise baffling adapter behaviours.
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CAN-FD (Flexible Data-Rate): why new cars "don't talk" to your old ELM327
What CAN-FD (Bosch, 2012) is, how it differs from classic CAN, why Tesla, Ford Bronco, BMW 2020+ need new OBD adapters, and how to check if your ELM327 supports CAN-FD.