Took a break from the wiring, and after scrubbing the tape sticky from my fingers, started looking through those board diagrams and schematics I downloaded.
First thing, many of those PDF's are not text searchable, which means you have to look at each page to find the chips and associated pinout. Second, the IC's listed on board diagram, don't used IC numbers.. Just place holder numbers, IE R12, or S5800. However, I did find some useful info towards our goal. Starting with our main workhorse IC, and by verifying the boards layout by checking pics on google, got us one winner pretty quickly..
That Bosch 30402 series is a common IC used across many of the boards. And I found one of our FICM's little brother EDC15C2, used by Audi 1.8T Diesel. Plus the board layout in this particular section, matches up with our FICM pretty well. However it has a 30343. But besides that, it's same chip.
Bosch 30343 / 30402 / 30430 / 30595 / 30604 / 30606 / 30639
Relais driver sop36 for edc15c2 diesel ecu
So I have found the docs for this EDC15C2 board, then focused in on that particular IC. Which then gives me the layout schematics, that lines up pretty good with our board from there to the FETS. They flipped the chip 180, but overall, I bet the circuitry matched up. So below is the docs to hone in on it. Hope this helps..
EDC15C2 PCB
In our board diagrams, that is shown here under file name
ME75C3_ober.pdf
Our schematic below that matches this board, is ME75C3_d03049_1_obere_haelfte.pdf.
Likely many others share this same chip schematic, but this one looks to line up with our boards pinout. IE, chip S4000 has what looks to be serial TX RX pins going somewhere I've yet to nail down. But another IC, S1080 uses SPI. So guessing if we print out all the scematics for one design, and tape them together, one should be able to easily trace out the main parts on this EDC15C2 board, and verify against our LB7 FICM EDC15C8 board. Then take what we know, and apply to our EDC15C12 LLY FICM board.
Guessing same shared components structure goes with the power supply section, main processor, and so on.. Seems to me they just move those main sections around to fit whatever the specific build. But everything under all the EDC15's share same basic layout best I can tell. At worst, the docs give us pinout for each chip, which isn't found via normal Online searching..
Hope that theory makes sense, it's late...
