ECU information and help needed

[Pr1ce]

Disclaimer: yes I've searched and searched (I'm not a new member) and the answers I've come up with are here and there.


Question: I sold my tuned ECU and needed another to make my car run back to stock... I purchased one locally to install in my car. 2003 5spQ 1.8t

I've heard multiple solutions to making my car work again ranging from "all 2003 and above are plug an play" to "no you can't swap ecu" or "buy any ecu and take to the dealership to install for 150$"

I have the ecu in hand uninstalled and my car is back to stock 100% just missing the ecu.....
I was told the ecu I have is immo defeated but truly I don't have proof. What is the best or correct way to get my car back running again with this "used" ecu and not messing up or making a bigger mess please.....

Thank you and thank you and thanks

- Nick

[SJorge3442]

Disclaimer: yes I've searched and searched (I'm not a new member) and the answers I've come up with are here and there.


Question: I sold my tuned ECU and needed another to make my car run back to stock... I purchased one locally to install in my car. 2003 5spQ 1.8t

I've heard multiple solutions to making my car work again ranging from "all 2003 and above are plug an play" to "no you can't swap ecu" or "buy any ecu and take to the dealership to install for 150$"

I have the ecu in hand uninstalled and my car is back to stock 100% just missing the ecu.....
I was told the ecu I have is immo defeated but truly I don't have proof. What is the best or correct way to get my car back running again with this "used" ecu and not messing up or making a bigger mess please.....

Thank you and thank you and thanks

- Nick

If the ECU has the IMMO defeated, it will be plug and play. I don't think you're risking anything slapping it in and giving it a shot.

[Pr1ce]

And if the immo isn't actually defeated?

So if immo is defeated drive away.... Hmmmm lol

[SJorge3442]

And if the immo isn't actually defeated?

So if immo is defeated drive away.... Hmmmm lol

If the IMMO isnt defeated, the car will start then immediately turn off. Im unsure if there would be any other issues for trying a ECU with the IMMO that isn't paired to the car.

[Pr1ce]

That's what I'm afraid of really.... If the immo is done then woohoo but if it's not by chance what are my consequences... The closest dealership is about 25miles away and a tow wouldn't be too much but still a trip I don't wanna make if possible

Are there "services" to make the ecu immo defeated ?

[SJorge3442]

That's what I'm afraid of really.... If the immo is done then woohoo but if it's not by chance what are my consequences... The closest dealership is about 25miles away and a tow wouldn't be too much but still a trip I don't wanna make if possible

Are there "services" to make the ecu immo defeated ?

Services, no. You need to have some tuning skill. kompresd does it, but he can't do it remotely. I'd wait till someone else chimes in about the repercussions of trying to start a car without the IMMO defeated and mismatched. I imagine theres no issue, but I'd wait to be sure.

[diagnosticator]

You should have got the SKC for your old ECU, and the SKC from the new ECU, then you could adapt the new ECU to your car With VCDS. If the new ECU is not immo defeated, there won't be any problems by trying it. The SKCs can be found by reading the ECU and then looking at the hex.bin file in a hex editor.

[Pr1ce]

You should have got the SKC for your old ECU, and the SKC from the new ECU, then you could adapt the new ECU to your car With VCDS. If the new ECU is not immo defeated, there won't be any problems by trying it. The SKCs can be found by reading the ECU and then looking at the hex.bin file in a hex editor.

Okay so I'll go ahead and try the ecu then and pray it's defeated. Regarding the SKC numbers... My old ecu has maestro7 on it... Would that matter to acquire the SKC you mentioned?

So that means both ecu would have to be hooked up to vcds... Pull the SKC and then swap them correct?

[diagnosticator]

Okay so I'll go ahead and try the ecu then and pray it's defeated. Regarding the SKC numbers... My old ecu has maestro7 on it... Would that matter to acquire the SKC you mentioned?

So that means both ecu would have to be hooked up to vcds... Pull the SKC and then swap them correct?

The SKC is read from the Hex dump file one ECU at a time, using nefmoto software, and a hex editor. The SKC is derived by taking the values in 32 and 33, swapping them then converting the result to decimal, adding a leading 0 for 5 digits if needed. With both ECUs SKC, the new ECU can be adapted to your car using VCDS.

With the immobilizer in the new ECU turned off, there is nothing to adapt in the new ECU. Adaptation only applies to ECUs with active immobilizers. If you want to turn the immo back on, then the new ECU will need to be adapted to the immo in the instrument cluster.

[Mokacrow]

Sorry guys. been away in France for a while.

Please see this link:http://www.esatinc.ca/Immobilizer/Th...mmobilizer.pdf

This is from a tech class that helps describe the process of pulling/matching/reprogramming the SKC. They refer to it as a PIN in the article. The SKCs in Audis are normally encrypted and require decryption software usually only available to registered locksmiths and VW/Audi dealerships. Any one that offers replacement key services will have this equipment.

The article also addresses how to reprogram the new ECU if the old ECU's SKC is known.

[EuroxS4]

If the used ecu you bought does not have immo defeat vehicle will start and stall.Wount damage anything.if you need the sic from your old ecu just read out the sky from the cluster it's the same.then plug in your used ecu and read skc.Then used vcds for o adapt ecu to immobilizer piece of cake.

[imnuts]

Sorry guys. been away in France for a while.

Please see this link:http://www.esatinc.ca/Immobilizer/Th...mmobilizer.pdf

This is from a tech class that helps describe the process of pulling/matching/reprogramming the SKC. They refer to it as a PIN in the article. The SKCs in Audis are normally encrypted and require decryption software usually only available to registered locksmiths and VW/Audi dealerships. Any one that offers replacement key services will have this equipment.

The article also addresses how to reprogram the new ECU if the old ECU's SKC is known.

The SKC isn't encrypted in the B6 and earlier platforms, it is just in HEX and needs to be converted to DEC. For the B7 and later platforms, you do need special software, but not for the B6. Assuming you have the right cable and software, pulling the SKC from the ECU is probably only a 5 min job, and 4 minutes is walking to the car and getting things setup.

[Pr1ce]

If the used ecu you bought does not have immo defeat vehicle will start and stall.Wount damage anything.if you need the sic from your old ecu just read out the sky from the cluster it's the same.then plug in your used ecu and read skc.Then used vcds for o adapt ecu to immobilizer piece of cake.

Not to skip over others comments but diagnoticator made my brain hurt with the hex dump taco brief case lingo....

Okay so pull my current gauge cluster... Read the SKC located on the back... Read the used SKC and adopt the used ecu via vcds.... Seems super simple and awesome

[EuroxS4]

Well with the cluster installed pull the skc from it this will be the original skc for the car then either on bench on it the car login to the ecu and pull skc from the used ecu U purchased then once you have both old and new skc you can adspt the ecu to the car

[Pr1ce]

Ohhhh shit lol

So both SKC but I only have mine :(

Lemme see if they might so happen to have the sku number if it does start up. I should be finished installing some parts today so I'll give it crank and report back