All - I have searched all over for this information but can't find any details.

If I apply 12vdc and ground to the correct pins to an ECU on the bench - what pins should I see/be able to measure activity on with nothing else connected to the box (sensor inputs, etc.)? Alternatively, at what points inside the box (on the circuit boards) should I be able to probe with a meter and ensure that the circuits that send voltage to each chip, component, etc. are getting the correct voltage as it travels around the board.

Thoughts?

 

I doubt that you will see much. The DME reacts to inputs and produces outputs. With just power and ground, nothing is happening.

That said, I look forward to your experiments and findings.

 

I'll give it a shot. Maybe someone has a schematic to this somewhere...

 

This might help (I did a google search for "Bosch Motronic Schematics"):
http://www.944online.com/yabbfiles/A...tronic-1_3.pdf

Page 24 of the document starts to show some information related to what you are looking for.

The DME is a Bosch Motronic system, so you may have more luck for searching by that as opposed to anything Porsche 944 specific. I would think Audi, BMW and Porsche (among others) probably all share a similar system. Further google searching may yield information you are after. Image results show alot of schematic results, so you may have to do some digging.