OBD2 connection

I just made myself a lead to connect a car OBD2 port to my dewe-43 ... more as a learning experience than anything else. As per the OBD2 plugin manual I connected OBD2 pins 14 and 6 to CAN input d-type pins 2 and 7 respectively. Now I can talk to my 2014 Skoda, but not to my 2001 Saab 93 (which is much more interesting as it has turbo pressures and stuff to look at).

I can only presume that the lead only works for J2284 (ISO 15765?) and that the Saab has something else. J1850 perhaps?

What other connection possibilities are there that the dewe-43 will support? Is it even worth making up a connector to access (say) pins 2(signal) and 4 (ground) or is the OBD2 plugin specific to the hardware layer that uses pins 14 & 6?

NB I have one of those ELM-327 devices that talks to anything, but I think it is reading more than two pins simultaneously and working out which have data on them.

Dear Nick,

For model years before 2014 there was no common OBD II Can bus and it is possible this will not work with Dewesoft. You can check on the connector in the car if you have wires connected on pins 6 and 14. If they are not connected then this is not supported. If they are, you can try to switch back to CAN (without OBDII plugin) and use the scan function to see if any messages are being read.

I have also found that SAAB 2001 uses a baudrate of 47,619 kbit/s, so please also try this.

One interesting link about SAAB CAN bus:

https://pikkupossu.1g.fi/tomi/projects/i-bus/i-bus.html

Best reagrds,

Primoz Gorensek

Hi All,

Sorry to rectify this post - but I've been having a similar issue with measurements on a Honda Civic (2012 model) - I'm assuming this could be due to the reasons explained by Primoz previously.

I also wanted to take the opportunity to check that my cabling is correct - am I right in thinking that the cable between the OBD2 and DSUB connectors only needs the Can High and Can Low connected - i.e. just 2 cables and none of the additional OBD2 pins are connected at the DSUB / Can end?

Thanks in advance for any help!

Dear Andy,

thank you for reaching out to us. Yes, you only need to connect CAN High and CAN Low with 120 Ohm resistor:

Kind regards.

Thanks Gregor, unfortunately I'm still having no luck with this - have also attempted on two different vehicles with no success.

If there is anything else which I may be missing, please let me know. (I've tried all baud rates etc).

Andy

Dear Andy,

have you checked that all vehicles that you tested support OBDII on CAN. We have tested OBDII on Honda Civic (year 2018) and it did not support OBDII on CAN while the VW Golf we tested the OBD2 on CAN worked.

Kind regards.

Hi Gregor,

Yes we have tried this on a Honda Civic and a VW TRoc with no success.

Dear Andy,

it is sad to hear that you were still not able to read the data. If you are using Sirius device we would suggest that you update the firmware and please let us know if this solved the issue.

Kind regards.

Hi Gregor, sorry for the delay.

Just to let you know, updating the firmware seems to have fixed the issue for us!

Thanks for your help!

Thank you for letting us know, Andy.