Reading OBDII data without Automotive Diagnostic​s Command Set.

[Rhys_CKTC]

Hello All,

Just wondering whether anyone has had any succes with reading OBDII data from a without using the Automotive Diagnostics Command Set add in for LabVIEW.

I mean, just using the standard CAN or XNET vi's?

I would like to read engine RPM and vehicle speed etc.

I have been able to read these PID's by downloading an evaluation version of the add-in, but I am slightly reserved to spending £900 for the software if it can be done otherwise.

Thanks

Rhys.

[Rhys_CKTC]

Hello All,

Just wondering whether anyone has had any succes with reading OBDII data from a without using the Automotive Diagnostics Command Set add in for LabVIEW.

I mean, just using the standard CAN or XNET vi's?

I would like to read engine RPM and vehicle speed etc.

I have been able to read these PID's by downloading an evaluation version of the add-in, but I am slightly reserved to spending £900 for the software if it can be done otherwise.

Thanks

Rhys.

[JGruenberg]

Yes, this is possible.  

The easiest way to figure out how to do this is to take a CAN trace using another tool to see whats happening on the bus.  Combine with some basic info on Wikipedia, and you should be good.

[markmakeitso]

Hi Rhys,

I did a fair bit of reading from OBDII messages for a project a few years ago. We had in-vehicle logging using analog measurement, OBDII requests and responses, and eavesdropping on normal CAN traffic on a couple vehicles. We didn't have any packages to use besides my school's LV academic license, and had pretty good luck figuring out how to get going. If you're interested I could dig up some code and pass it along. Does your current VI have access to raw CANbus messages?

If you have some breathing room in your budget I would recommend purchasing the J1979 standard from SAE, although even with that in hand there are still some details to dig up.

Have fun over there,
Mark

[RezaAB]

hi markmakeeitso,

Could you share your program, I want to know how we can read OBDII data without any additional tool.
I really appreciate your help.

Reza