As promised, ELM support is still being worked on. Today I have had some success; you will need the latest CVS source to try it out. Due to an oversight on my part, much more still needs to be done. At least, ELM devices (and some ebay clones) can now be used. For now, only the following method will work :
scantool> set interface elm /dev/ttyUSB0
scantool> set l2protocol raw
[loads of warnings, followed by "Connection to ECU established" ]
scantool/diag> sendreq 01 00
For some reason, requests often need to be sent twice before getting a response. With some effort it is still possible to view & clear DTCs :
"sendreq 03" will return active DTCs
"sendreq 04" will clear all DTCs & freeze frame data.
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