Hello!

Iīm the owner of a 190D 2.5 Turbo -92 (VIN 2011281F965640) with an annoying problem. When starting the engine (engine cold) everything works normally. When reaching normal operating temperature, i suddenly
looses power. First I expected some diesel line trouble, but since I didnīt find anything unexpected I turned to the turbo system. Installed a Turbo pressure meter and did some test driving. It turns out that
the turbo pressure disappears after a while, typically 1-5 minutes after starting the engine.

Iīve done some investigations on this. First checked all vaccum lines.. Seems to be OK. Next turned to the electrical parts. Realized that the car is equipped with an EDS box. Got an analog multimeter and hooked it
onto the X11-connection to be able to retreive fault codes. Got a numer of error codes (15, 5, 4, 8, 2, 3), cleared them all out (since the clearout havenīt been done for years I guess), and took the car for another
testrun. When loosing turbo pressure again i returned to the multimeter to check error codes. Only number 5 appeared this time. (Number 5 indicates failure in the EGR system).

I've got an error troubleshooting diagram, where Iīve checked all components according to fault code 5. Everything seems OK.. Ordered a new vaccum transducer, which I got yesterday, but changing it didnīt make any difference.

Here is my questions:
- Under what circumstances do the EDS set error code 5?
- How do the EDS realize that there is a fault in the circuit?

Any help is greatly appreciated!