Category: ECU Diagnostics
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ECU Diagnostics – part 8 : Easimap uses ISOTP (sort of)
Post Views: 1,278 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: 1,581 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: 1,051 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: 1,059 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…
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ECU Diagnostics – part 4 : Wireshark Patching and OBD-II Results
Post Views: 1,420 When Wireshark first appeared, it was called Ethereal… and its motto was: “Sniffing the glue that holds the internet together” Wireshark sniffs the packet-glue that holds the internet together and is one of the most influential pieces of open source software there is. That’s a pretty bold statement and I even count…