renault espace 4 jk 3.0 dci no connection to the motor control unit

hello together, had given me a few weeks ago eninen renault espace. test drive was really great with the vehicle, so hit and registered. then the car picked up and then the fun started. ca20km drove and parked he jumped already badly. then he ran again and drove 3-4km and suddenly took no more gas, bid I finally remained lying down. adac called and said nir then the def tank drove empty. ok fuel filled in worried and then ran e r in spite of venting not so properly. so the adac wanted to connect his diagnostic device. unfortunately he had no connection to the motor control unit then he dragged me to the next renault workshop. this renault workshop sold the espace to the dealer where I had bought it and said they had sold the car with defective high pressure injection pump and had not passed the information on to me. no matter I thought I had to make in Winterberg at has drive technology. a ls this my car picked up called me the renault dealer and told me that he had seen again in the papers and it was not the pump. unfortunately too late, dS car was on the way to the sourland. well, no matter, I informed the workshop that wanted to take care of the pump about the fact that the car probably has no diesel in the tank and maybe not at the car. after three weeks of waiting I called in the workshop to see how far my car is and you share e me with that one would have already repaired the high pressure injection pump, which I actually no longer wanted and which was now unnecessarily done after all. with the workshop master talking to the car only with their device to run said to me that he would not get a connection to the motor control unit. if the engine runs with its device connected then it runs badly and when the brake was working it went completely out. unfortunately the good one knew all these symptoms no has anyone ever had the problem before? or does a ne idea what it can be??