I don’t believe it’s your car because:-
1 - if there was a CAN fault you would have these faults in your instrument cluster - temp gauge into the red, no tacho, engine failsafe message in CC etc.
2 - You can read fault memories - with ISTA you can see the DME in the tree with no faults (DME in green) and DME with ! in DIS.
To prove this, you could introduce a fault - such as disconnecting the left HFM and then starting the engine - it will then log an inlet air temperature fault - then scan it with both ISTA and DIS. ISTA should show the DME in the tree in orange (you can then read the fault memory with the bottom right bottom) and DIS should show the DME with an X after the short test and then the fault/s and a test schedule on the next page after you select the bottom right arrow.
The ONLY way to read the DME with an OBD USB cable is with EasyDIS with Fister Protocol selected.
(And without the DIAG HEAD Emulator program - this disturbs the communication to the DME).
When you have it connected and communicating correctly the top right of the screen showing your connections and signal strength will look like this:-
Edit:-
So, I finally had time to dust off my extremely old HP nx6120 running XP to prove that this could still be done!
I apologise but I did get a couple of settings wrong.
- If you’re using an OBD USB FTDI cable then you need to use the Softig Profile with VM on. The GT1 screen strength signal will be 100% green and the Head strength signal will be blank.
EDIT:- for me the above was incorrect.
My USB would only work with VM off.
I could do a short test in both Softig and Fister protocols but only get into the DME functions in the Fister Protocol.
So the same exact settings as ADS below:-
- If you’re using an ADS FTDI cable (e.g. Tiny ADS) in a serial port you need to use the Fister Profile with VM off. The GT1 screen strength and the Head strength signals will both be blank.
You need to confirm correct communication using the API test.
Also these instructions worked 100% for me, although results vary......