Nissan Qashqai +2 no longer starts

Hello ?????? The following problem: Nissan Qashqai +2 no longer starts from today to tomorrow. ADAC called error code read out, nothing has been noted. Suspect of diesel pump. Workshop: error code read out (no errors available ) the only thing to see was that there was no Rehldruck (200bar) available. 1. Diesel pump changed , car does not jump to 2. high pressure pump changed , car does not jump to 3. and drain lines checked , car does not jump to With starting aid (brake cleaner) starts car, all parameters present , dan after 5-10 min engine out of no pressure there. Car can no longer start Dan. Nissan contract workshop 1. all to and flow lines again controlled 2. fuse box renewed 3. partly wire harness controlled 4. Sensors checked No success, car does not jump even though all partometers are present. Car jumps only with start aid (brake cleaner) starts very calmly . But goes after a few minutes again a us , and does not start any more. Workshop is perplexed and do not know any more . Has anyone had this problem ? Can someone help me there? Thanks already in advance . And sorry for spelling , and possibly for the bad wording is unfortunately not from the subject .