The mass marked with a blue arrow is now screwed in a different place. It should be screwed under the plastic of the positive terminal (there is a ground there), but suddenly it stopped connecting. So I screwed it to a different place. The voltage on the DME plug was around 4v-5v instead of 12v.
I have a different engine, but I had the same problem. The structure should also be similar.
Zdjęcie:
https://files.fm/u/pu6mv9sxx5