ECU has no label... Need Help

603racing · Post by **603racing** » Wed Jul 04, 2012 1:02 am

I picked up a parts car today. It's an '83 euro just like the race car. The ECU was sitting in the seat and the label is missing. Is there a way to tell what ECU it is? Pretty sure this car is supposed to have a 011, but again, the label is gone.

Brucey · Post by **Brucey** » Wed Jul 04, 2012 6:27 am

you know what? -I can't immediately think of an easy way of telling the answer to your question.

If you compare the internals it will narrow it down a bit, but it won't provide an unequivocal identification AFAIK

cheers

Pod · Post by **Pod** » Wed Jul 04, 2012 8:09 am

You will be able to narrow things down a little by looking at the cut-out at the "hinged" end where the multipin plug fits into the ECU. This is designed to allow only certain units to fit each connector. HTH!

603racing · Post by **603racing** » Fri Jul 06, 2012 1:27 pm

I guess another way to approach this is... how many different ECU's came in a Euro model 635 in 1983?

I believe this is a UK car as it has fuel in liters, speed in MPH, and English language labels.

Brucey · Post by **Brucey** » Fri Jul 06, 2012 1:37 pm

if it was a UK car the steering wheel would be on the right. We were on gallons (proper sized ones) in 1983, too.

BTW there is no guarantee that the ECU belongs with the car, is there? It might be what broke it...

cheers

603racing · Post by **603racing** » Fri Jul 06, 2012 5:02 pm

Good point on the steering wheel.

The head gasket blew, thus the reason for it being a parts car. I plan on rebuilding the motor... hard to come by a Euro 3.5 for a decent price in the Midwest of the US.

bpoliakoff · Post by **bpoliakoff** » Sat Jul 07, 2012 7:04 pm

O11 should be the correct ecu and very scarce.

Pod · Post by **Pod** » Sun Jul 08, 2012 9:35 am

bpoliakoff wrote:O11 should be the correct ecu and very scarce.

Here are a couple of pics of an 011 if that helps?

603racing · Post by **603racing** » Tue Jul 10, 2012 4:05 pm

Thanks for the info guys, I'll pull it and the 011 I already have apart and compare.

603racing · Post by **603racing** » Fri Jul 20, 2012 6:37 pm

Finally had time to do this. Opened up the mystery ECU, checked the layout and any numbers i could see printed on the boards to compare to my 011. They were identical, so I hooked it up to the race car and... VROOOM! Fired right up and ran great! I did a little celebration dance then drank a beer.

Makes up for the ECU I purchased that didn't work at all.

Pod · Post by **Pod** » Sat Jul 21, 2012 12:50 am

Congratulations

Griffter · Post by **Griffter** » Sat Jul 21, 2012 5:54 am

Out of interest why are you running 011 on a race car? I thought 011 was not reprogrammable but 061 is interchangeable (with the right air flow meter) and has a socketed reprogrammable chip?

603racing · Post by **603racing** » Wed Jul 25, 2012 7:54 pm

Two reasons. Couldn't find the info on which airflow meter would be needed. Also couldn't find much info on the 061 ecu and chips for the 10:1 compression Euro M30b34 motor.

If you have this information I would be a very excited reader.

Pod · Post by **Pod** » Thu Jul 26, 2012 7:30 am

Griffter wrote:Out of interest why are you running 011 on a race car? I thought 011 was not reprogrammable but 061 is interchangeable (with the right air flow meter) and has a socketed reprogrammable chip?

So are you saying that an 061 will work on an earlier car with the matching AFM it was originally paired with? If so, and the chip is reprogrammable, then I am as excited as 603racing!

Griffter · Post by **Griffter** » Thu Jul 26, 2012 9:17 am

All I know is that Rich at Fritz's Bits was trying to persuade me to fit an 061 and airflow meter from a M535 to my Alpina. This, he said, would be plug and play and enable the fitment of a reprogrammable chip.

I haven't tried it but I would be very excited to hear from anyone that has!!

Chris Wright · Post by **Chris Wright** » Thu Jul 26, 2012 1:51 pm

My notes seem to indicate that an "027" AFM was used with the 061 ECU which makes sense, the 059 (US Spec.) which I know uses the 027, and the 061(Euro Spec.) were both used in the same years and the 061 is supposed to the similar to the 059, just no O2 sensor. But both also use the high impedance injectors, where as the 011 used the low impedance injectors, so I'm guessing the injectors would need to be changed out also.

Here are my notes which have simply been gleaned form posts on the forums. They are incomplete and not all verified, so if someone has some more info to fill in or spots some errors, please let me know:

U.S. Spec:
Model/Year ...... ECU Number ...... AFM No. ......... Dinan Chip P/N - For Motronic Version
633csi ... '??-'80 .... 00? ....................... 002 .................. ---N/A ----- - L-Jet - (uses low impedance injectors)
633csi ... '80-'82 .... 00? ....................... 013 .................. ---N/A ----- - L-Jet - (uses low impedance injectors)
633csi ... '82-'84 .... 008 ....................... 016 .................. D900-3311 - Motronic 1.0 Basic (uses low impedance injectors) - 9/81 to 9/84
635csi ... '85-'87 .... 059 (24 Pin) ........... 027 .................. D900-3521 - Motronic 1.0 Adaptive
635csi ... '85-'87 .... 059 (28 Pin) ........... 027 .................. D900-3522 - Motronic 1.0 Adaptive
635csi ... '88 .......... 150 ....................... 027 .................. D900-3531 - Motronic 1.1 Adaptive
635csi ... '89 .......... 179 ....................... 027 .................. D900-3532 - Motronic 1.3 Adaptive
M6..... 9/86-12/87 .. 079 ....................... ??? .................. ---N/A ------ - Motronic 1.0 Sport (uses low impedance injectors)??

Euro Spec:
Model ... Year .... ECU No. ..... AFM No. .... Motronic Version
635csi .. '7x-'80 ..... 00? ............. 002 ......... L-Jet - (uses low impedance injectors)
633csi .. '81-'82 ..... 001 ............. 013 ......... Motronic 1.0 Basic - (uses low impedance injectors)
635csi .. '81-'82 ..... 002 ............. 013 ......... Motronic 1.0 Basic - (uses low impedance injectors)
635csi .. '83-'84 ..... 011 ............. 018 ......... Motronic 1.0 Basic - (uses low impedance injectors - 126 or 130)
M635 .... '8?-'8? ..... 055 ............. 025 ......... Motronic 1.0 Sport - (uses low impedance injectors - BMW part # 1 307 029)
635csi .. '85-87 ...... 061 ............. 027 ......... Motronic 1.0 Adaptive - (similar to the 059 but without the O2 sensor)
635csi .. '88-89 ...... 0?? ............. 0?? ......... Motronic 1.? Adaptive

Bosch ECU part number prefix = 0 261 200 xxx - (Engine Control Unit; i.e. Motronic Computer)
Bosch AFM part number prefix = 0 280 203 xxx - (Air Flow Meter)
Bosch Injector part number prefix = 0 280 150

More ECU Info on the differences between the Euro/US:
http://forums.bimmerforums.com/forum/sh ... stcount=12

Pod · Post by **Pod** » Thu Jul 26, 2012 11:05 pm

Thanks guys!!! I guess I'd better cancel my ebay auction for an #061

603racing · Post by **603racing** » Fri Jul 27, 2012 5:49 pm

Just to add more of a twist to this info... I just picked up an '83 Euro parts car with the 011 ECU (as expected) and 201 injectors (not so expected).

I'm guessing the 061 ECU would only work well with the Euro motors since they are 10:1 compression? If I get some extra cash together I may try to pick up a 061 and matching AFM. I'm also going to try to speak with Rich to see what kind of gains can be made with this setup.

Pod · Post by **Pod** » Fri Jul 27, 2012 5:55 pm

Please don't forget to share this info. with us - its getting rather interesting!

603racing · Post by **603racing** » Tue Jul 31, 2012 5:46 pm

I'm full-on researching this. I'm also in contact with Fritz's Bits. I will post all my findings.

Pod · Post by **Pod** » Tue Jul 31, 2012 7:15 pm

Thanks

tschultz · Post by **tschultz** » Sat Sep 16, 2017 10:55 pm

Great info here! I just tested and an 008 won't work in place of an 002 like I suspected. Now to track down an 002 to see if it is the root of problems on an '81 Motronic...

bpoliakoff · Post by **bpoliakoff** » Tue Sep 19, 2017 4:50 am

Tom

002 is what you need. That is what first year Motronic as used on the Euros needs

Brucey · Post by **Brucey** » Tue Sep 19, 2017 8:43 pm

Injectors and ECUs were matched as follows
(Impedance) Bosch (last three digits) BMW (last six digits)

(L) 201 273 272 9/80 - 5/82 Euro 633 & 635 (001 and 002 ECU's)
(L) 201 273 272 9/81 - 9/84 US 633 (008 ECU)
(L) 201 273 272 all M6 and M635 (055 and 079 ECU's)
(L) 126 273 271 5/82 - 9/82 Euro 635 (011 ECU)
(L) 130 286 026 9/82 - 9/84 Euro 635 (011and 018 ECU)
(H) 203 276 149 9/84 - 1/86 US & Euro 635 (059 and 061 ECU's)
(H) 714 276 988 from 1/86 US & Euro 635 (059, 061, 150, 179 ECU's )

Each setup uses a particular AFM part number too.

cheers

tschultz · Post by **tschultz** » Mon Oct 02, 2017 1:50 pm

I confirmed the AFM is correct in my application and tried a different ecu with no change. The engine dies without an ecu so then I tried a spare ECU. The engine fired right up and revved freely for the first time! However, it had a difficult time transitioning out of idle and after about 2 minutes, a similar issue occurred and the engine wouldn't rev.

Trying to see where I can get one or both of my ECU's repaired. I opened them up and they both had a black part on the board--I am thinking it is a design flaw of overheating or something similar. Wiring and other components all checked out and it ran good when I fixed the issue.

My worst case scenario is to use my M30B32 engine harness and 008 ecu with low imp injectors, but the problem is that it won't have O2 feedback so I'd rather not do that as I am guessing the mixtures/fuel maps are different.

bigcoupe.com

ECU has no label... Need Help

ECU has no label... Need Help

Re: ECU has no label... Need Help

Re: ECU has no label... Need Help

Re: ECU has no label... Need Help

Re: ECU has no label... Need Help