Modifying Motronic 2.3.2 ECU hardware and software.

[prj]

I need to check the code, but you don't really need to know much about how the actual logic works. You need to apply some 5v/gnd to some of the pins that you can see on schematic that go to the I/O extender. The autobox stuff such as S_FS is a good candidate among others.
Then you need to log the bitfields in the main ECU, you can hijack the MAF_T/MAF_C in the stream for that as those are 1:1. It is then possible to map what is what where.

I did this a long time ago, but I don't have any notes, because it was a one-off.

[macof]

At first many thanks on the creator of this mod.
I have tested it and almost all is working nice.
But i have problem with boost regulation.
All the time i see only spring pressure and n75 dc is zero, target boost is only 150 kpa. In map is 270 kpa.
Please, can somebody help me what i m doing wrong?

[prj]

Any fault codes?

[macof]

No fault codes.
But when i put the emulator on the 87c257 chip, i see no tracing.
Here is the log, but the boost is made by manual boost controller.

[-ice-]

Dumb question, but you do use a latch adapter for the boost eprom? Like boost button.

[vwnut8392]

No fault codes.
But when i put the emulator on the 87c257 chip, i see no tracing.
Here is the log, but the boost is made by manual boost controller.

I noticed the same problem when i tested the speed density software in my car as well. I have an older version of the boost chip with logging that worked, im going to try that code base with the PRJmod speed density motor chip and see if everything works from the boost side. if that does work than it narrows down a problem in the in the boost chip software.
I think i had the MFTS boost cut patch enabled, not sure if it disables the logging output as well because N75 DC and N75 base stay 0 on my testing.

Dumb question, but you do use a latch adapter for the boost eprom? Like boost button.

yes but boost button does not sell them anymore. you have to buy they raw PCB and assemble it yourself. its not very difficult if you have basic soldering skills.

[Rikki Kitto]

I feel so stupid, great work guys, i think

[Acki]

I'm lost :-D

[vwnut8392]

Very awesome work BMWman91! i'll have to catch up and read up on your posts. you could be a very dangerous person with the ability to access chips like this especially if you can capture the raw data from them while they are exposed.

For bench testing you could look at the jimstim engine simulator. it may not simulate the BMW crank triggers but it will do just about everything else. i have simulated everything for the M2.3.2 but the crank/cam sensors. i have done TPS, IAT, CLT, 0-1v oxygen sensor input, tested all of the analog inputs tied directly to the processor by either grounding, applying 12v, and 0-5V via jimstim potentiometer to them. i would imagine you could do the same with the BMW ECU especially if its a normal 60-2 crank sensor and 1 window cam sensor than you could even run the ECU from the simulator. check it out.

[bmwman91]

Great idea! It looks like like there is a V2.0 firmware available for it which simulates a bunch of toothed wheels...maybe you can load that into your board? It is super cool that you are emulating the engine...I have always wanted to try that. I might see about picking up a JimStim.

For the most part, I am just a curious hobbyist. I had zero idea of what I was going to get when I busted the plastic package off of S702 lol. As with most things in life, I find that simply being willing to try something new and not being afraid of failure leads to good things. It also happens that I am an engineer in the electronics industry and I have access to all sorts of tools which I could never afford myself (and an employer that is cool with after-hours projects as long as nothing gets damaged)!

[prj]

If you want to discuss the M2.3.2 ECU, post here:
https://www.s2forum.com/forum/technical/m232-org

If you want to discuss truly aftermarket management, start a thread in this section.

I will browse through the thread and pick up and move some of the information into the M2.3.2 forum.

[Sonic]

This thread is locked for now to try and assist the organisation of the thread by Prj. Any problems please drop me a message.