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Author Topic: How to determine which ECU is in my A6  (Read 46310 times)
shane0569
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« on: February 12, 2013, 03:45:37 PM »

Hi, I've been searching around for some time now and can't find info on how to determine which ecu is in my 01 A6 2.7 without actually removing it?

I probably just missed it, anyone?

Thanks
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nyet
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« Reply #1 on: February 12, 2013, 03:51:40 PM »

VCDS

also:
http://nyet.org/cars/files/stock/part-numbers.txt

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ddillenger
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« Reply #2 on: February 12, 2013, 04:05:35 PM »

Open the ecu box (under the hood, right next to the brake master cylinder reservoir) and read the label, or use VCDS lite to connect to ENGINE, it'll be listed in the top left. Very likely 4b0907551aa if you have a 2001 manual trans car, or 4b0907551al for auto.

However, none of this matters. You're not going to want to take the time to tune your stock file, and since I doubt there are any available definition files, your best bet weill be the following:

8d0907551m if you have a manual trans car
8d0907551l if you have a tiptronic car

Those flashes crossload without issue, and they both have very complete definition files available.
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shane0569
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« Reply #3 on: February 12, 2013, 06:40:07 PM »

4B0 907 551 K

So, is that good for flashing?
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ddillenger
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« Reply #4 on: February 12, 2013, 06:45:33 PM »

4b0907551k is a 2000 ecu. Only used in 2000 models, and it would have a bosch MAF table/offset. Is your car a 2000, or a 2001?

Also, check the MAF sensor. Is it hitachi (2001-up cars) or bosch (2000 cars). If it's a hitachi sensor, and the ecu is a 4b0907551k, the ecu was either reflashed, or your car isn't running at it's true potential.
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shane0569
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« Reply #5 on: February 12, 2013, 06:48:21 PM »

So I am having a hard time remembering where I found certain information on this site. I know I've come across certain information that I am attempting to relocate...everything is so spread out between different sections and such.

What number does 4B0 907 551 K represent when it comes to the ME7 #?

And...if you had to put it very straightforward when laying out exactly what needs to be done to ensure a safe effective flash experience...what would it encompass? Like at the minimum...

for example...

1.  Locate ECU number
2.  Find custom tune file that corresponds with your ECU
3.  Read current ECU file a backup
4.  Flash new rom
5.  Run program to verify checksum??
Huh

Thanks again
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shane0569
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« Reply #6 on: February 12, 2013, 06:49:23 PM »

My car is a 2001...
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ddillenger
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« Reply #7 on: February 12, 2013, 06:57:02 PM »

What is the ecu number in vag-com/vcds. Does the car have a bosch, or a hitachi MAF (Mass Air Flow sensor)?

Someone either reflashed the 4b0907551k with the appropriate flash for the MAF installed, or switched to a bosch MAF (assuming they did it properly).

Priority #1

Determine which maf is installed in your car.

Priority #2

Connect with nefmoto, select FULL READ FLASH (you will be prompted to select a memory layout, select 29f800bb). Then, post the bin here.
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shane0569
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« Reply #8 on: February 12, 2013, 07:00:05 PM »

Would I just look on the MAF itself or run VCDS?
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ddillenger
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« Reply #9 on: February 12, 2013, 07:00:55 PM »

Look at the MAF itself. While you're doing that, read the flash off the ecu so when you come back in you can post it and I can give you proper assistance.
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shane0569
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« Reply #10 on: February 12, 2013, 07:12:32 PM »

Ok, so it's a bosch MAF.

And this is my first time playing with the software and I'm not sure it's working properly.

I'm running 1.9.3.2, would it still be FULL READ or a different option?

and is that supposed to work on Win 7 x64?

And what's the deal with the licensing?
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shane0569
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« Reply #11 on: February 12, 2013, 07:14:06 PM »

I did a Read ECU Info, and it returned some info, but I don't think that's what I am supposed to be running...
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shane0569
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« Reply #12 on: February 12, 2013, 07:14:52 PM »

Nevermind, just found it... just a moment...
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shane0569
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« Reply #13 on: February 12, 2013, 07:19:21 PM »

Can't do any operations, I guess I need to license it...?
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ddillenger
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« Reply #14 on: February 12, 2013, 07:21:34 PM »

No. Before you can click FULL READ FLASH you have to SELECT MEMORY LAYOUT. 29f800bb (I did tell you this a few posts up). Once you do that, you can read the file. Licensing only enables premium features such as DTC DECODING and FAST FLASHING options.
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