My bad. I wish I had an excuse for the brain fart, but I'll have to own up to this one. I forgot that you're working on a diesel -- this plus the fact that I was pulling the information out of my memory (or perhaps some bodily orifice) didn't help. I have owned several cars with the ACCII type system but they were all gasoline engine cars, thus the correlation.

Another reason to disregard my previous post would be the comment about Chrysler based systems. That statement was NOT due to brain-fade. That (expletive deleted) Rube Goldberg designed servo was originally used on Chrysler vehicles. Mercedes-Benz, on occasion, will not try to reinvent the wheel itself and will purchase "well engineered" components from the best available source; this explains the use of Delco A-6 compressors on the early V-8's. They probably took one look at the servo, wiring & vacuum diagrams and were suitably impressed by its complexity. I can just imagine the conversation…. Look ut zis Hans - Zose Americans vinally got sumzing right – vee vill uze zeez…

Good luck

RTH