Different engine part numbers - what does each one mean?

Hello,

First of all, I want to give this page a big thumbs up... I just spent 2.5 hours updating my knowledge, and while I couldn't really get much out of most of the information because it was very technically detailed, I still have to give credit to this collection of knowledge.

Now, to my problem/questions:

I bought a tuning chip (or two) on eBay for my car, and it also included the engine code and engine control unit number that should match the car. It does.

It's a Golf 3 90 PS TDI with the ECU number:
028906021 C and engine code 1 Z

However, there is a second number on the ECU:
0281 001 308/309

And I have already used this number instead of the 308/309 I see versions 366/367.

What do these numbers mean? Is it a random software version?

Also, another question: If I have 308/309 and my chip is designed for 171 (according to the seller), what happens after installation? Or is it possible to make a suitable software update (if these numbers even have anything to do with the software version) before I re-solder the chips?

I would be very grateful for in-depth knowledge or profound answers.

Your 3nzo

Hi,
Your STG is an older MSA12 (unfortunately, there are also newer MSA12s that require different software; not compatible). The STG contains two 8-bit controllers (80C517 from Siemens / Infineon). One for the boost pressure, one for the injection volume (roughly speaking).
'0281 001 308/309' is the Bosch part number for a device (but it should correspond to 028906021AF?). According to my documents, the Bosch code for part number ...021C is ...001 171?!
If you insert the chips, nothing will work in the worst-case scenario.
You should see that you can remove the original chips safely, so that you can replace them with new ones if necessary. So far, I haven't had any STG chips die have failed due to incorrect software (although this doesn't guarantee that it won't happen anyway). Then, please use sockets with reversed contacts. These hold better and can be soldered from both sides of the motherboard if necessary. If you have no idea about soldering, ask someone who does (rather than having a leg lose contact while overtaking on the road and enriching the accident statistics).

Yeah, that's definitely interesting information - however, these two (apparently incompatible) numbers are actually listed on my control unit.

When I moved from the LINKS database on this page to the BOSCH page, I found the following table:

Engine Control Unit, Diesel (MSA 12) 0281001249 09.93-06.94
Control unit with integrated immobilizer function for vehicles with automatic transmissions

Engine Control Unit, Diesel (MSA 12) 0281001241 09.93-09.94
Vehicle No. -> 1H-S-120 000

Engine Control Unit, Diesel (MSA 12) 0281001170 09.93-09.94
Vehicle No. -> 1H-S-120 000
Control unit with integrated tow-away lock function

Engine Control Unit, Diesel (MSA 12) 0281001247 09.93-07.96

Engine Control Unit, Diesel (MSA 12) 0281001310 07.94-09.95
Vehicle No. -> 1H-T-180 000
Control unit with integrated immobilizer function for vehicles with automatic transmissions Control unit with integrated immobilizer function

Engine Control Unit, Diesel (MSA 12) 0281001325 07.94-07.96
Control unit with integrated immobilizer function for vehicles with automatic transmissions Control unit with integrated immobilizer function

Engine Control Unit, Diesel (MSA 12) 0281001308 09.94-09.95
Vehicle No. 1H-S-120 001->1H-T-180 000
Control unit with integrated tow-away lock function

Engine Control Unit, Diesel (MSA 12) 0281001323 09.94-07.96
Vehicle No. 1H-S-120 001->
Control unit with integrated tow-away lock function

Engine Control Unit, Diesel (MSA 15.5) 0281001421 10.95-07.96
Vehicle No. 1H-T-180 001->
Control unit with integrated immobilizer function for vehicles with manual transmissions


There, therefore, the number 171 is not listed at the end - it would be interesting to know from which source you obtained your data!

Thank you for your help.

3nzo

Hi,

> Yes, this is initially an interesting piece of information - however, these two (apparently incompatible) numbers are actually present on the control unit.

Super

Bosch consistently surprises.

>Therefore, the number 171 is not even listed at the end - I would be interested to know from what source you obtained your data!

> Engine Control Unit, Diesel (MSA 12) 0281001170 09.93-09.94
> Vehicle No. -> 1H-S-120 000
> Control unit with integrated tow-away lock function

is the 170/171 (sometimes they only provide the first number).

The data comes from a list that a developer from the tuning scene provided me with. So far, they have always been accurate. That's life.

Hello,

Since I'm currently fixing a defect on my 1Z and the control unit is lying on the workbench, I can only confirm that the number 0281 001 308/309 belongs to a 028906021AF (which is written on it).

Hmmmmm Naja, dann habe ich wahrscheinlich einen 'Schläfer' in meinem Auto.

Engine Control Unit, Diesel (MSA 12) 0281001170 09.93-09.94
Vehicle No. -> 1H-S-120 000

My car was manufactured in 1995, which, according to the list I provided, would also match my VIN number:

Engine Control Unit, Diesel (MSA 12) 0281001308 09.94-09.95
Vehicle No. 1H-S-120 001->1H-T-180 000

The only question that remains is what happens if I install tuning chips designed for 170/171 engines into my STG?!?!

So long ...

3nzo

Hmm...

I would recommend the following approach:

1. Remove old EPROMs (in your case, you must ensure they remain intact, as it is not possible to reliably determine the original software version from the STG markings).
2. Socket (inverted contacts!) installation
3. Read original EPROMs and compare them with the data of the tuning chips.

If differences only occur in specific areas that resemble the 'Kennfeld' -> Install and test tuning chips.

If there are many differences -> Restore the original version.
Also, please also send the original dataset to the seller of your chips. Maybe he has a suitable dataset.

If you are unsure about the differences, please feel free to email me the datasets (I will not be using them; my STG is a BF).
I can't promise anything, but maybe it will help.

I also have a list of original programs.
The number 0281001171 is normally always linked to 028906021C.
There is also a SW setting (at 171 D60).
This control unit only has a pressure sensor up to 1 bar of boost pressure. If you want a complete list, please send an email to abckrems@go.to.
I can also check the software and, if you wish, I can tune any of the following numbers:

I don't know what programming capabilities you have for EPROMs.

Pressure sensor with 1 bar:
0281001171 028906021C 2287358696
0281001171 2287358697
0281001176 287358416
0281001176 287358417
0281001185 8a0907401B 2287357914
0281001185 2287357913
0281001193 287358447
0281001193 287358410
0281001197/198 028906021D 2287358771
0281001197/198 2287358770
0281001241/242 028906021Q 2287358698
0281001241/242 2287358699 281001246 028906021R 2287358702
0281001246 2287358703
Here, the control units have a pressure sensor with 1.5 bar.
0281001248 028906021BJ 2537355554
0281001248 2537355553
0281001252 028906021P 2537355896
0281001252 2537355897
0281001253/254 4A0907401E 2537355603
0281001253/254 2537355604
0281001258/259 028906021J 2287358689
0281001258/259 2287358690
0281001308/309 028906021AF 2537355548
0281001308/309 2537355547
0281001316/317 028906021AP 2287357876
0281001316/317 2287357875
0281001320/321 4A0907401P 2537355328
0281001320/321 2537355329
0281001323/324 2287357887
0281001323/324 2287357888
0281001354/355 028906021BT 2537355595
0281001354/355 2537355596
0281001367 028906021F 2537355585
0281001367 2537355586
0281001368/369 028906021AT 355100
0281001368/369 355101

Damn. You're all right - the mechanic had given me that number when the car was being repaired, and since I needed to act quickly when I bought it, I called him to give him the number.

It is indeed an AF motor that I have, which is why the 308/309 suffix of the second number on the control unit also fits.

Now I definitely have a completely (???) wrong chip for my PLC.

Chip: 0281001171 028906021C
STG: 0281001308/309 028906021AF

And what should I do now? Can anyone exchange?

On my chips it says:

Powerchip TDI
TDI - 1Z - Engine
028 906 021C 028100171
Chip #2287358696

and

Powerchip TDI
TDI - 1Z - Turbocharger
028 906 021C 028100171
Chip #2287358697

and according to the chip packaging, it is from TEXAS Instruments.

Maybe someone here is interested and can arrange a 1-for-1 exchange.

Or is there another solution?

hello

3nzo

Hello, I have the program for the control unit.
Would you be interested in it?
Do you have access to an EPROM programmer?
The EPROMs could be erased and programmed with the new software.
Unfortunately, I'm from Austria, so it would be easier.
The chip numbers you would need are:
2537355548
2537355547
corresponding to the number 0281001308/309

I'm getting a new, compatible chip for my STG - unfortunately, it's a bit more expensive, but that's okay. The other one was so cheap that I'll now be able to take the difference back when I sell it.

Thank you very much for your help!

3nzo