NEEDING ASSISTANCE WITH CAN BUS

Hi

 I am wanting to develop an external vehicle speed and engine RPM gauge for my old Jimny 3 (2015) and my new Jimny 2022 vehicles.

I would like to make accessing the info as simple as possible so I plan to read the CAN BUS data via the OBD2 connector directly.

Can anyone provide me with the CAN BUS addresses for these two parameters?

Any assistance will be greatly appreciated.

Thanks
John

I don't think the Gen3 Jimny uses CAN bus on OBD2, it uses KWP2000, see here

www.bigjimny.com/mediawiki/index.php/Com..._failure_diagnostics

I don't know what the Gen4 uses.

I have Torque Pro fitted to an Android head unit and that reads revs and vehicle speed, it uses the standard PIDs, see the full list here

en.wikipedia.org/wiki/OBD-II_PIDs

Or, you could just use Torque Pro, a cheap BT dongle and have a nice big rev counter, speedo and every other guage you want on your own custom scrren layout.

Robin

Many thanks for your quick response, Robin!

By using a BT dongle I am able to read most of the parameters and codes from my Jimny 2015, but for the application I'm developing I don't want to use the OBD2 protocol. I need to drop down a level and interface with the CAN bus directly.

Using OBD2 I can access the PIDs, but it's not quite what I want.

Cheers
John

I am fairly sure that the 2015 Jimny will not have CAN bus on the OBD2 connector. It may have CAN bus somewhere internally but I doubt it is accessible.

I don't know about your the Gen4, a Google search turned up nothing, so again it might not be present on the OBD2 connector, or if it is, it might not be documented or very useful.

Robin

John, is your need to access the CAN via the OBD port driven just by the choice of the dongle?

I once did a similar project on a Mini, and as I recall I just picked up the bus at a window switch connector or similar connection. Is that not an option for your project?

BTW if I were doing a similar project today I would get one of the nice new oscilloscopes out of China, which have a full suite of CAN functions. Sniffing the speed & rpm messages would be pretty straightforward with a tool like that. Then one could use any old microcontroller for the comms -- a mockup or even full implementation with Raspberry Pi or Arduino would be pretty cheap and easy, for example, if you didn't want to build something from scratch. Just an observation.