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That probably means that's a CCD Bus connector, not SCI...

OK, here you go. Just go to patents.google.com and input these numbers. Enjoy :thumb:

4875391
4887491
4905545
4928235
4935872
4936167
4938102
4939928

Depends on the year. The older units are factory flashable. But, I started dis-assembling the original '89 units because Chrysler so generously documented the operation of the software in the...

Thanks. What's the next page? Looks like it describes what the TCM uses the signals for...

I'll have to see what data exactly it gets from the CCD bus...

It's not CAN; the older TCM's use the CCD bus. Which was Chrysler's proprietary bus that pre-dated CAN. They still get many signals over the bus.

In that case, the scaled value come over the CCD bus. Not the analog signal. So, it wouldn't be one of those.

Thanks for the pic for the range selector. According to that, they are individual...

CKP isn't an 'analog' signal, it's a switch. Actually, it's not just a switch, it's a frequency input (same for ISS and OSS). Important for sure, but not a 0-5v analog signal. It's not the one I'm...

Tried to read the 3 other EATX controllers I have (4796122, one marked for a 93 3.3 Dynasty, and another one unmarked. They all seem to have slightly different board layouts, 2 of them use a 28C512...

Yeah, I have the pinout.

What I really want to know is, which of these signals are 0-5v analog voltages, rather just an on/off switch. For example, are the pressure 'switches' simple on/off...

What analog sensors does the TCM have on it's own? IE, not data it gets from the CCD bus.

There is apparently a 'pinion factor' that has to be programmed into the later TCM's when you swap them between cars.

No Idea. The '89 is noticeably larger than the later model TCM's. I suppose they made a bunch of improvements.

On the one hand, I know my flash module will work in the '89's. On the other hand,...

Not sure what you mean? But, no, they don't have the slope encoded. It's interpolated by the lookup routine.

Done.

Morris, here's an actual table output from my dis-assembler. The last byte pair seems to be repeated in every case. I think this must be the same case as the 3D tables - IE, it's used for the last...

The .bin I read off the '89 TCM is complete. I finished the 1st pass dis-assembly on the plane ride to Paris.

The 8x8-bit table format is this:



X0,Y0 ; point 0
X1,Y1 ; point 1
X2,Y2 ;...

Well, one step forward, 2 steps back. It's very clear that the upper .bin I read today does NOT go with the lower .bin provided by Straxx from reading the chip. Addresses that should match, don't....

Here's the full .bin and a first run through the dis-assembler. Nearly no comments added yet. It's basically un-readable.

'89 TCM Dis-assy

I will update this link in the future with the latest...

Miles Dyson. My hero. Nearly had my wife convinced to name our first son Jonathan Conner. She caught on, he ended up Jonathan David, instead.

Built a benchtop TCM reader this afternoon. Got the upper memory sucked out of the '89 TCM no problem. So, now we have the full (nearly) 64k image to work with. Including the EEPROM ,so we can see...

Gotta love Chrysler's thoroughness with the A604 patents. The bootstrap signal is on a separate pin, much like the SMEC. Of course, it's not a documented use in any of the 60-way pinouts. Luckily, I...

Yep. One benefit of working in the auto industry...

I have 17 days off starting on the 18th. I'll try to get a benchtop boot setup working by then. I had one at one point, but it never worked right. I ended up cannibalizing it for something.

With 2 different, and not really related, threads going; I thought I'd start a dedicated TCM reverse engineering thread here in the tuning section.

I dusted off the cobwebs in my old notes (and...