Hello, I'm new here and own a Renault Mascott built in 2003 with 2.8 dci and a Bosch control unit (BOSCH EDCMS6.3 0281001892).
To my problem, I have no connection to the control unit.
Neither via clip with Renault RTL202 probe nor with DDT4ALL and OBDLinkSX usb interface.

With clip I only see the UCH and immobilizer.
With DDT4ALL I only see the tachograph.

I also have a Delphi tester with Autocom. With Delphi I can access the engine control unit and ABS.

I've been trying to overspeed the Mascott for weeks and just can't connect to the controller. I also checked and replaced the OBD connection.

What I noticed is that there is only one cable from the engine control unit to the OBD connection.

Pin 7 From Bosch device to OBD pin 3 ???

As I now understand, pin 7 from Bosch should be the K line and pin 19 from Bosch should be the L line.
I also connected it like this for a test, i.e. 7 from Bosch to 7 from OBD and pin 19 from Bosch to OBD 15.

What am I doing wrong???

Can one of you do that on the control unit if I send it to him.

Incidentally, that would be perfectly legal since my Mascott now has 3.5 tons.

I'm happy about every food for thought.