I succesfully decoded can-bus data from a VW Caddy, but know nothing about OBD and trucks.

For a research I need now to read a truck's exhaust temperature (EGT sensor), possibly by OBD. I would prefer this method instead of going through FMS (that is normally hidden into the dashboard) or pure can-bus (a little nightmare on its own, both because of finding the access points and the incompatibility among producers).

Is this parameter normally accessible (i.e. in Volvo trucks)? Is there any info available on the Net about reading parameters from trucks?

Or could you suggest other ways to read this parameter?

I am going through California's ODB regulations at https://www.arb.ca.gov/msprog/obdprog/hdobdreg.htm at the moment.

Thank you in advance

  • Have you looked on the net?
    – Solar Mike
    Commented Jul 3, 2018 at 10:26
  • Of course. I simply don't understand what is returned by OBD, FMS and which stuff is standard and what is not. I didn't find any university study to help me out with this (using "site:.edu" in google)
    – Alex Poca
    Commented Jul 3, 2018 at 11:40
  • University study?? What about car manufacturers... they are the ones who set proprietory codes ie volvo, mercedes, bmw, jaguar etc
    – Solar Mike
    Commented Jul 3, 2018 at 17:17
  • @SolarMike, you cannot imagine how difficult it is to get this kind of info. Sometimes there are studies made by universities where they use interfaces. It is a common shortcut to read what they did and improve on their experience. Manufacturers are kind of "jealous" of their know how (i.e. the proprietary ODB messages) and don't release this info even after proposing a Non Disclosure Agreement. This proprietary info is something you normally pay a lot, if it is sold at all: When I was working with cars they asked for 10-50.000 euro for the Can-bus codes FOR EACH CAR FAMILY.
    – Alex Poca
    Commented Jul 4, 2018 at 7:24
  • 1
    I did not mention ethics or morals - you did and a good point it is too!
    – Solar Mike
    Commented Jul 5, 2018 at 8:23


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