First of all I found my new PSU looks to be semi dead. The current limiting works and has prevented smoke, but the voltage control seems to be non-existant, and its always outputting 17v. I didnt realise this before the obdpro reported 17v on the bus, and the multimeter confirmed it. Doh! Lucky the regulator was doing its thing and could handle it...... Big time waster that since the shop is only open business hours, is half way across the city and Im normally carless at work...
Anyway I got a couple of hours to play with this. I hooked the obdpro up to the bench '0411 and the bench cb radio 13.8v supply but no joy. I just kept getting back 'NO DATA', and none of the elm apps would scan with it. I wasnt sure about the protocol but I figured that it should be able to pull random data off the bus if I hit init in the ls1flash tool with the avt on the bus at the same time. No joy. It is still of course possible that Im just not set up right. Would love some advise on this if anyone is good with the elm protocol.
Code: Select all
>ATZ
OK
ELM327 v1.1
>AT@1
1.05
>ATRV
13.6V
>ATSP2
OK
>ATDP
SAE J1850 VPW
>0100
NO DATA
>ATBD
06 68 6A F1 01 00 17 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
So I busted out the dreamsource labs dslogic pro I purchased a few weeks ago, and found it doesnt work on win 10 due to unsigned drivers. I found this method worked
http://www.howtogeek.com/167723/how-to- ... d-drivers/ and did a bit of bus sniffing. To my surprise I did sample data which looks like VPW coming out of the obdpro. But the packets look too short.... and they are shorter than what Im getting out of the AVT (which is pictured here):
So, I think it might be time to see how hard it is to write a VPW protocol decoder for sigrok....
http://sigrok.org/wiki/Protocol_decoder_HOWTO
Once thats done it'll be an invaluable tool from here. Right now I know enough to get started but not enough to pull this off. This is going to take time, patience and study