A Caterham Seven Blog
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ECU Diagnostics – part 9 : The Easimap Protocol Theory
Post Views: 1,250 Ok. so we’ve set ourselves up to be able to look at what is going on with a Caterham diagnostics port, we’ve talked a bit about the theory of what we might see from the port and we’ve also seen that Easimap talks to the ECU using a higher level protocol called…
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ECU Diagnostics – part 8 : Easimap uses ISOTP (sort of)
Post Views: 1,440 Ok, that’s enough of the theory about mapping. Lets get back to what Easimap is doing when it talks to the car. When we left this subject last we had got to the point where we could see what Easimap was sending and receiving on the CAN bus, but we didn’t know…
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ECU Diagnostics – part 7 : ECU Maps and Mapping
Post Views: 2,141 People often talk about “mapping” a car. When they do that they’re usually interested in one or more of three things: To increase its performance Improve its fuel economy Improve its drivability So what is mapping? In technical terms a map is a translation, or conversion, function that takes an input and…
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ECU Diagnostics – part 6 : Reading Material
Post Views: 1,083 Another quick one, really quick this time… Mark (CTRMint) had been doing his research and had told us about a book he was buying, and I just couldn’t resist… The book isn’t the cheapest of purchases, at least not in the UK. But for me it was well worth it. It took…
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ECU Diagnostics – part 5 : The Correlator Dead-end
Post Views: 1,107 Hopefully this is a quick post… The story so far is that: We’ve got a test bench made of a Raspberry Pi, CAN bus decoder board and an OBD Y-cable The Raspberry Pi can “sniff” all the packets sent between the car’s ECU and something that can talk to the car, like…
Got any book recommendations?