Tag
#standards
3 posts in Car Diagnostics blog about "standards" — OBD-II diagnostics, DTC codes, repair. ← All posts
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SAE J1979-2 (OBDonUDS): why your scanner suddenly reads less
A newer car that returns fewer parameters than an older one is not faulty and your adapter is not broken. The legislated data moved to a different protocol.
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WWH-OBD: the world harmonised standard replacing classic OBD-II
The standard your adapter speaks was written in the 1990s for petrol cars in California. WWH-OBD is what replaced it, and it changes what a generic tool can read.
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OBD-II vs EOBD vs JOBD: do the differences affect you?
Three names, one connector, largely the same protocol. The differences that actually matter are about which year your car was built and where it was sold.