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Car Forum / Ford / Ford Cars / September 2006

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Messages on CAN Bus

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Kevin - 15 Sep 2006 09:31 GMT
Hello,

I'm working on a project thats measuring engine performance and fuel
economy.  Since the 2005 Ford we're using has a
CAN network, we thought we could get some engine messages off the CAN
connector. We bought a CAN to USB adaptor and started recording
messages.

(Time),Channel
id,Flags,DLC,Data0,Data1,Data2,Data3,Data4,Data5,Data6,Data7,(Counter)
0.1,1,1024,2,7,32,0,232,131,64,28,194,0,1
0.1,1,1104,2,7,31,214,2,156,16,176,32,0,2
0.1,1,768,2,5,5,126,154,6,0,0,0,0,3
0.1,1,368,2,8,16,144,100,101,18,198,14,56,4
0.1,1,786,2,8,124,35,128,127,255,35,124,35,5
0.1,1,805,2,2,0,129,0,0,0,0,0,0,6
0.1,1,818,2,8,128,240,129,15,255,255,0,202,7
0.1,1,70,2,6,0,0,0,0,0,0,0,0,8
0.1,1,1200,2,8,40,101,40,105,40,103,40,99,9
0.11,1,1024,2,7,32,0,232,131,64,28,194,0,10
0.11,1,368,2,8,16,145,100,101,18,199,14,56,11

These messages appear common.  The software from kvaser, canusb.com,
WGSoft and any other program I've found simply display lines of data
like these (either in decimal like this or hex)

The messages I found for ODB-II are mostly 4 bytes and don't match, and
we've looked at SAE standards and these messages do not match the J1939
documents we found (although they are 8 bytes).

Does anybody know how to convert these numbers into words and real
values with units?

Thanks,
Kevin
Jim Warman - 16 Sep 2006 02:38 GMT
Would this be the 16 pin DLC you are referring to? The only streaming
information you will find there is what is being shared by the various
modules..... unless you request more information using commands from a scan
tool...

FWIW, since you are looking at engine performance parameters, I might
suggest something like the AutoEnginuity program - it appears to be favoured
by many DIYers and will access PCM PID data for you..... This data includes
parameters such as mass fuel desired, ignition timing, mass air flow, short
and long term fuel trims (correction), engine load, fuel pressure and
perhaps temperature (on gasoline engines), injector pulse width and the list
goes on. These parameters can be monitored while the unit is being operated
and (IIRC) can even be recorded with this software....

HTH.

> Hello,
>
[quoted text clipped - 31 lines]
> Thanks,
> Kevin
 
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