CAN-bus project

wstar

Anyone have technical details about accessing some of these values on the canbus (specific addresses / modes / PIDs / whatever)?

My biggest wishlist stuff to get get from the CAN bus:

1) Brake Pedal Pos (for the datalogger)
2) Oil temp (to feed datalogger, also to display on dash somewhere so I can get rid of the triple-meter).
3) 7AT TCM Temp (also for datalogger + dash).

If I at least had technical details, maybe I could get RaceKeeper to consider adding support for logging them alongside my other data. It would be really cool to get the those two temps onto CAN-driven dash gauges as well, something like this: 2-1/16" Freedom CAN-BUS Oil Temp Gauge 140-300F. Auto No Warning Light From Speedhut. , but those are for late-model GM ECUs only.

I had a hint on oil temps in the past, which I lifted from elsewhere... Mode 45 (that's hex, I think, not decimal?), PID 111F (hex). I never got any results trying to use that in various ways through simple OBD-II tools like Torque, though.

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SouthArk370Z

I did some researching about a year ago but got frustrated by the lack of free data for the non-standard PIDs (most, if not all, modes above $0A are proprietary). Most of the info is available but it is quite expensive - too much for a hobbyist. You can find most of my results at the link in my sig.

If you look through Knio's source code, you can find the Mode/PIDs he is using.

During my research, I got the feeling that some of the CAN-to-computer I/Fs were not made for "exploring" the CAN bus. They massage the data and will sometimes not pass certain messages. Not sure this is actually true. Apparently, the I/F Knio is using works well.


Edit: PS: As far as I can tell, mode and PID addresses are always given in hex.

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