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Discussion Starter #1
I think I've read here previously that folks have successfully swapped in the Motronic from an automatic-equipped car to a 5-speed, is that correct? I seem to recall too that there may have been some issues, though I'm not recalling any details.

Any way, assuming that the above is true (please feel free to tell me it's not), what if I replaced the calibration EPROM (after-market or stock), from the 5-speed Motronic into the Automatic Motronic? Would I essentially have a 5-speed Motronic at that point?

I guess what I'm really asking is are any/all differences between the Auto and 5-speed Motronic addressed via the calibration EPROM?
 

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I think I've read here previously that folks have successfully swapped in the Motronic from an automatic-equipped car to a 5-speed, is that correct? I seem to recall too that there may have been some issues, though I'm not recalling any details.

Any way, assuming that the above is true (please feel free to tell me it's not), what if I replaced the calibration EPROM (after-market or stock), from the 5-speed Motronic into the Automatic Motronic? Would I essentially have a 5-speed Motronic at that point?

I guess what I'm really asking is are any/all differences between the Auto and 5-speed Motronic addressed via the calibration EPROM?
brad,
They all used the same motronic ECU: Bosch 0261200117 or 60543462

S is the different ECU.

Jason
 

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Thanks Jason. Are you suggesting that even the calibration EPROM is the same between the 5-speed and Automatic cars?

For clarity, I should add that I'm just talking about the '91- '93 12V cars here.
Hey Brad,

I cannot say for sure but I think they are. We use the same Chip for example for a 5 speed and an Auto.

Most swaps I know of are from L to S and having problems running an L ECU and AFM with a S motor.

Jason
 

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Brad see page 597 and 601 in wiring diagrams pin 11 of ECU is jumpered to ground G131at S25 red connector pin 1 to pin 2 for 5-speed and not jumpered for A/T.

Both ECUs are -117 so it is jumper that makes difference.
 

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Discussion Starter #6
Brad see page 597 and 601 in wiring diagrams pin 11 of ECU is jumpered to ground G131at S25 red connector pin 1 to pin 2 for 5-speed and not jumpered for A/T.

Both ECUs are -117 so it is jumper that makes difference.
Interesting... I wonder if that's just to engage the kick-down function, or does it actually cause a different set of functions to engage in the software.

The good news is that I can grab the ECU from an Automatic car and have a useable spare.
 

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Interesting... I wonder if that's just to engage the kick-down function, or does it actually cause a different set of functions to engage in the software.

The good news is that I can grab the ECU from an Automatic car and have a useable spare.
Looking closer at the diagrams I still think they are all the same regardless unless I am missing something?

S25 which is for the automatic transmission is also for Manual transmission.
There is no specific information stating PIN 11 (grn/blk) or S25 is AUTOMATIC ONLY pin.

So either way your fine. Should not effect it in anyway.

Jason
 

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I seem to remember Leonard putting in an auto ecu in a 5 speed and there seemed to be no rev limit on it. We drove the car to 7K before it ran out of steam.
 

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Discussion Starter #9
Okay, so I have in front of me a Motronic ECM, as pulled (yesterday) from a 9/90 built car w/ Automatic. :) As indicated above, the Bosch part# is 0 261 200 117. I haven't cracked the case open to see if there's a sticker on the EPROM, but I'm wondering if perhaps the sticker on the outside of the case might provide any indication of calibration differences. There are a total of five different numbers on the sticker, three of them co-identified with bar codes. I'll try my best to indicate these below, roughly in their orientation on the sticker:

(empty space) 004
(bar code) 810
*066.15*
(bar code2)
*26SA0816*
(bar code3)
*1512000192*

Does anyone happen to have a 5-speed B/L Motronic handy that we can compare numbers with?
 

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Brad do a plug and play and move on AS THE BOSCH MOTRONIC ECU 0 261 200 117 is correct cumphewta for 91-93 164 12v V6. Do not plug in an after market chip unless it is a certifiable one such as Squadra Tuning one.

004 and 810 on both of my spares but TWO top and bottom bar coded numbers different on both of mine and do not match yours either. However COMMA The middle bar code one 26SA0816 is the same as yours on both of my spares.

DON'T ASK ME IF THESE ARE FROM A 5-SPEED as I don't know I have swapped them around so many times between 5-speed and A/T models and they work just fine.

I even sold my third spare -117 to a 93L 5-speed owner and once he had my good one in his car came alive again.
 

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Discussion Starter #11
Brad do a plug and play and move on AS THE BOSCH MOTRONIC ECU 0 261 200 117 is correct
I don't doubt that they are swap-able and functionally equivalent, but what I question is whether the calibrations are 100% identical between the 5-speed and automatic. It's not a big deal - just a curiosity thing more than anything, as every other vehicle I've worked with have different calibrations for the automatic and manual transmission versions of the same car.

I'm not forgetting about the jumper, but I've never seen a jumper used to execute different software, just hardware.
 

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I don't doubt that they are swap-able and functionally equivalent, but what I question is whether the calibrations are 100% identical between the 5-speed and automatic. It's not a big deal - just a curiosity thing more than anything, as every other vehicle I've worked with have different calibrations for the automatic and manual transmission versions of the same car.

I'm not forgetting about the jumper, but I've never seen a jumper used to execute different software, just hardware.
OBTW there is another feature piggy backed onto system in A/T cars using pin 28 of ECU -117 to read signal from relay I62 for selected gear signal in A/T models see page 786 in wiring diagrams. relay is deenergized in all gears and energized in P-N. When deenergiized it sends 12v signal to pin 12 for smooth gear engagement so that maybe how they programmed system outside the ECU BOX.
 
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