NefMoto

Hi guys,
In need of some advice.

My car has a stock 4B0907551S, I've sourced a stock 4Z7907551D and removed the immobilizer.
When I've used this new ECU (551D) the car started beeping and the (!) symbol was flashing in the dash together with ABS and ESP warnings. (And ABS module error P1849 - 35 - 00 )
I've assumed it was the ABS module misbehaving and tried to code it using VCDS (following this procedure http://wiki.ross-tech.com/wiki/index.php/Audi_A4_(8D)_Brake_Electronics_(Bosch_5.3_ABS/EDS/ASR/ESP) )
I was able to code it but when I got to the adaptation part I got an error saying that I needed the registered version (I was using the light version) .
I refitted the original ECU (551S) assuming that everything would be fine but the issue remains.

(please check video : https://www.youtube.com/watch?v=PPRmnx4pDfE )

My guess is that now the ABS module is not recognizing any of the ECU's and I need to use the full version of VCDS to code it. But I wanted the validation before investing 200$.



29/05/2020 - Edited title for visibility.
From:ABS / ESP problems
To:P1841 - 35 - 00 Engine Control Module / Transmission Control Module Incompatible

Good clone(VCDS) can code ABS
BDW. You didn't need to touch coding of ABS at all.
Yust code new ECU

I was not aware of vcds clones. I'll search for it.


So, what should I do? I had searched s4wiki and the solution appeared to be to code the abs.
https://s4wiki.com/wiki/Anti-lock_braking_system

the clones are all over alibaba and what not. mine was 45$ i think and it works mint with vcds, nefmoto, cluster programs, and i can data log with it

Solution is to code new ECU to same as old was

Thanks, can you point me to the correct thread or page? I just don't know what to code and how.

Share your old / new EEPROMS and ROMs and someone can point you in the right direction.

https://diagtools.lv/images/coding-balloon.png

Copy code from old ECU to new ECU

OK, thanks for the help.

Sorry to come back to this , but was able to source an oldlaptop with VAGCOM and I'm trying to do this.
I think I did what was hinted but without sucess .

What I've done:
1.Reinstalled original ECU and reseted ABS erros . Car runned fine (at least in the garage I didn't drive it other than a few meters).
Got a picture of ECU Coding
https://drive.google.com/file/d/1Xfs5zTQ1E1hTu6OxAJSUSPhomOncLs9U/view?usp=sharing (https://drive.google.com/file/d/1Xfs5zTQ1E1hTu6OxAJSUSPhomOncLs9U/view?usp=sharing)

2 Reinstalled spare ECU
Got a picture of coding
https://drive.google.com/file/d/1MtoKcuOazVqKFMeC8lHIwmU3EYuvUZJk/view?usp=sharing (https://drive.google.com/file/d/1MtoKcuOazVqKFMeC8lHIwmU3EYuvUZJk/view?usp=sharing)

3 Recoded ECU using the recode option , soft coding was already the same only shop coding was different.
https://drive.google.com/file/d/1TseojSQA8U2Kp_D1bqOKVgD4sopfob9Z/view?usp=sharing (https://drive.google.com/file/d/1TseojSQA8U2Kp_D1bqOKVgD4sopfob9Z/view?usp=sharing)


4 Started the car and was faced with the same error P1849-35-00
https://drive.google.com/file/d/1-Ect-7BgsJS4Fu-rkSbpKtuVYi0f22Ne/view?usp=sharing (https://drive.google.com/file/d/1-Ect-7BgsJS4Fu-rkSbpKtuVYi0f22Ne/view?usp=sharing)


5 tried to clear ABS codes without sucess ( https://www.youtube.com/watch?v=zDZvgIS0n5s&feature=youtu.be )

What did I missed ?
I can see that extra and component are different but in option 7 I can't seem to be able to recode those.

(Sorry if this is turning out frustating for you :(  , I know that this is the most basic stuff  )

In trans what DTC you have?

P1841 - 35 - 00 Engine Control Module / Transmission Control Module Incompatible 
 :'(

https://www.youtube.com/watch?v=OAh-Z6fioPE&feature=youtu.be

Would this be the actual hardware , tune , or coding ?

Any insights guys?

why not just flash the original soft and eeprom from the original ecu to the new? or like everyone else said use vcds and change the soft coding to match whats required to run that trans.
 

Well, because I'm a noob. And since different programs exist for different purposes I assumed that writing the original soft would only write into a specific part of the memory instead of making the ecus an exact copy.
(Also I previously compared both files with tuner pro and no differences were found, probably because they are not defined properly)

Regarding the coding I'm also confused because  both are coded 00001 regarding trans coding.

On top of that I was worried that some hw difference could exist.

But thanks for the input I will test with the original soft on this ECU and pick it from there. However I'm afraid this will happen again once I flash a more defined file into the ecu.

upload both files. if they are both 1mb or both 512kb they will cross flash. imo your best option is to cross flash it to the usdm b5 s4 auto / tip    8D0907551L file. it shares the same def as the manual 8D0907551M b5 s4 file. also here in the usa the b5 chassis never got immo so when you flash it to an immo on ecu it disables immo in flash. 99.9% of the s4 wiki applies directly to the 8D0907551M file and thats 1:1 calibration addresses of the auto 8D0907551L if you choose to use it. if you need help feel free to pm me

Thanks for the help mate .
I'm in the shed messing with the car right now . So I will probably post in the next few hours .

I was able to flash 8D0907551L but the behavior seems to be the same.
I've sent you a PM Marty. Thanks for the support.

Maybe ECU you bought have some hardware failure

I have an entire car (2002 Tip Allroad) . And it was working (I drove the car for a few meters more than once with no issues)
I can't start the car now to double check because I've already removed substancial parts from it.

Maybe I cooked the ECU removing the immo?

Another stupid question. Even though the software controller states "Controller: 4Z7 907 551 D" looking at the actual ecu on top of the part number "4Z7 907 551 D" there's an AUDI stamp stating "4Z7 997 551 DX". Could this be an issue? Or is irrelevant?

VAG shows a rebuilt item by adding an X to the end of the part number.

The plot thickens.

So... flashed image from the original ECU to the spare one and it works. So ECU is OK.
Please check https://www.youtube.com/watch?v=Ft_0RWygPR0&feature=youtu.be

Also (previous) failed attempt running the L-Box https://www.youtube.com/watch?v=MP7E3U3JYto

The only difference that I can find is the "Extra" info in the controller info for the original 4B0907551S image.

Is there a way to write this Extra info in the L file? Do you reckon this could be the solution?
If not is there any way to find 4B0907551S definition file?
Any other idea?

Ok guys , think I've made it :)
Found that 8D0907551G shares the same definition ( http://nefariousmotorsports.com/forum/index.php?topic=9672.0title= ) as 4B0907551S .
As such used that definition with the original 4B0907551S Image (In the DX ECU) and apparently was able to raise the Idle to 1500 rpm for testing purposes and code out the SAI .
I've also defined max speed to 120km/h and tommorow will go for a ride to see if all defs are really reliable .

Thanks to everyone that tried to help.

Small update to finish the topic.
Was able to see imediately the idle rpm raise . Also did a couple of km's without any SAI codes appearing .
However I was able to drive way above 120km/h , I did it at 150/160 without feeling any loss of power .
Could it be that VAVMX is not a hard limit , and just another parameter with only a specific weight ? I'm trying to find it in the FR but can't seem to figure it out .

Use VMAXNB for speed limit.
VAVMX is unused "dummy" parameter if car is without active suspension level control.

Thanks, that explains it.