W212 350CDI -09 W219 320CDI -07 Ex:W220 320CDI -01 Ex:W210 270CDI -01 EX: W211 320CDI -04
That's awesome! I can't understand either how control module can behave only slightly off... unless there are some bad soldering/high resistance of the sensor input circuits or control outputs/current control. But weird anyway...A bit progress today evening: I received refurbished ABC Control Unit from ABC Specialists Nl and changed and adapted it.
I got immediately first time more than 173 bar pressure - I got 193, which I have measured from other MB earlier, as well!
I had just removed the auxiliary pressure gauge from pressure relief valve, so there is a bit air in system. That obvioysly caused the pressure to drop temporarily, but it anyway immediately jumped back to 193 bar.
Tomorrow I'll do bleeding and we'll see!!
Looks to be very likely that the issue is close to be solved!