Some users had problems reading Mercedes EDC16CP31 ECU with fetrotech tool. Tried all listed pinouts on pcm tuner list, no connection. Says s1&s2 pinout error.
Users found a few different pinouts for this ECU and none of them worked.
Solution:
Please see attached for Mercedes-Benz EDC16CP31 on fetrotech.
Use this top pinout
pay attention to the gpt wiring, as we found the colors on the pinout we used do not match numbers. Opposite to each other.
It is working now. Fetrotech tool read and write no problem
See also:
http://www.pcmtuner.org/fetrotech-tool-mercedes-edc16c2-pinout/