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This took way too long (MAC-11 ECU info)

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 Post subject: This took way too long (MAC-11 ECU info)
PostPosted: Sat Apr 15, 2017 2:31 pm 
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I've finally started to fully label / make sense of the MAC-11 code, define all the maps, etc. But the first step was to find what outputs/inputs were connected to the microcontroller.

Anyway I ended up completely disassembling the board to trace the whole thing, so I present to you - full MAC-11C schematic. It should be about 99% correct. Might have mixed up a couple traces. A couple components I missed values on, and some I wrote two values for :tard:

A couple of the grounds are 'dirty' at the engine, others are through the harness. I didn't differentiate that on the drawing of the main connector. I did on some of the outputs, but probably missed some. (the forked style ground symbol means engine ground)

I'll sort some of that out and post a v1.0.1 some day, but figured I better post it now before I change gears and lose interest in this project like usual. ;)


Only a couple decades late:

http://audi.slavtek.com/sch/MAC-11C-sch100.pdf


The design as a whole is really primitive, and it unfortunately uses a couple house-marked, undocumented, application specific ICs (the ADC/timer chip for reading sensors / controlling ignition; and the knock sensor IC).

More work along these lines to come, hopefully.


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 Post subject: Re: This took way too long (MAC-11 ECU info)
PostPosted: Mon Apr 17, 2017 3:52 pm 
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Quote:
I've finally started to fully label / make sense of the MAC-11 code, define all the maps, etc. But the first step was to find what outputs/inputs were connected to the microcontroller.


Maybe this will help you out (old email from SJM):

Quote:
If memory serves me, Orin started with the original RDH 1983 Audi quattro MAC02 dis-sassembly I sent him and then after locating the engine fault codes (2112 etc) in the EPROM data, he worked backward to locate many of the important data locations using the op code instructions which pointed to where the data was located.

This was the same process I used to locate all the MAP reference values when I installed the 2.5 bar sensor in the MAC11

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 Post subject: Re: This took way too long (MAC-11 ECU info)
PostPosted: Mon Apr 17, 2017 5:38 pm 
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Great minds I guess, I've been using that technique as well, but it's fairly convoluted and slow going.

Maybe it's smoother for someone better with assembly. It makes my eyes bleed after a while. I was curious about the hardware as well.


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 Post subject: Re: This took way too long (MAC-11 ECU info)
PostPosted: Tue Apr 18, 2017 5:46 am 
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That's fantastic, nice job! And, thanks for sharing!

Looks like the knock circuit is fairly complex. One of the larger circuits and uses the in-house chip.

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 Post subject: Re: This took way too long (MAC-11 ECU info)
PostPosted: Tue Apr 18, 2017 6:46 am 
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Yeah I think the knock IC is probably quite primitive so it needs a lot of parts around it to couple and filter signal around.

Most the Bosch ECUs (ME7 era, anyway) use their CC195 chip which does 2/4 channels of knock, and needs no external parts (just a handful of signals from the processor). So it must be a much more advanced design, where all those passive parts are integrated into the silicon.


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