2002 Mini Cooper S. I bought a simple OBD2 KKL connector on ebay (BMW/MINI specific). INPA returned IFH-0003 datatransmission to interface disturbed when I attempted to connect to anything on the car.

I took the cable apart, and verified there were no defects and that everything was working ok (even reverse engineered an exact schematic if anyone is interested). Next, verified INPA and the cable were working and sending bits when not connected to the car (with an oscilloscope).

After that I suspected a problem on the car's end, so I unsoldered the bridge on pins 7 and 8. At that point I was talking to the primary K-Line (D-Bus) only, with only the DME, ABS, and power steering on it. Now INPA works ok. So I believe the problem must lie on the secondary K-Line (DS2-bus) somewhere.

Has anyone encountered anything like this before? There is nothing on the car that is non-functional. So if there is a module that is disrupting communications on the DS-2, the fault would be limited to the diagnostic bus only and not the module's primary functionality.

Any advice welcome.

 

Just looked at the bus/wiring diagrams. Seems the only two things on the DS2-bus are the IKE and steering angle sensor. I guess the problem is in one of those two, or the wiring for DS2. Could problems on the single wire K-bus be affecting the DS-2?

Found a good page on the Mini's bus systems here:There is a bus in my mini

 

Figured it out, wasn't the car at all, it was the cable. Bad solder joint attaching OBD pins 7,8. When I de-soldered them, reflowing it allowed good contact to form fixing the problem. I've reattached pins 7,8 and it works good now. I was probing with the oscilloscope where the signal leaves the board, not the actual pin that makes contact in the car. So the board was putting out a proper signal, it just never got to the car. D'oh.