Mercedes benz Cl500 EIS repair W215

[Nano21]

Hi everyone. I have a cl500 with bad EIS. It would work hot and cold and intermittently. I took the EIS out and read the 2nd mcu with Digimaster3. And saved the data. After I replaced the mcu with a new one and wrote data back. I installed the EIS back to the car and now no communication to the EIS. I took out the EIS and read the original mcu with the vvdi2 prog and wrote it back the original data. Still no communication. I have checked my soldering job and it is ok. What are my options for repairing this issue. Thnx everyone.

[lylezim]

why did you change the mcu what happened to the original one

[Nano21]

Hi. Well the original mcu would work intermittently. When hot worked well but when its cold no. I have heard that in that case mcu is the problem. I purchased another mcu and wrote the dump in the there but no luck. I soldered the origin mcu back in and no start. I have tried communication with DAS, no communication. I'm stuck now. Don't know what to do. I have checked my soldering and it all looks ok.

[Nano21]

Can anyone please help me with this issue????????????? Thank you