TDI ECU Reprogramming: Fix Warm Start Issues

Hello everyone,

Does anyone have an idea on how to recode my engine control unit (ECU, part number 028906021 EK, for a Seat Ibiza with engine code AFN) using VAG 1552?
It is currently encoded as 00002, and I want to encode it as 00011.
"When I enter 01/07/00011, I receive the message 'Function unknown' or 'Not possible at the moment'."
Perhaps it should be mentioned that this engine was installed in a VW T3 bus, but I'm struggling with what's known as a "warm start problem." A friend who has done several conversions told me that he always solves this problem by reprogramming the engine control unit (ECU). Unfortunately, he also told me that, to his knowledge, this specific EK (Seat) ECU cannot be reprogrammed. Maybe someone here knows more about this topic, or how I can solve the warm start problem in another way. I've already replaced the battery and starter.

Best regards,
Christian.

Hello Christian,
The 021EK module has only one lookup table block, and that block has the coding 00002 .

However, this problem should be easily fixable by anyone with a basic understanding of car audio systems.
You could ask Rainer how much he charges for it.

Best regards,
Rudi

Hello Rudi.

Thank you very much for the quick response.
Can you perhaps tell me which control units can be re-programmed? What about the 028 906 021 JC?

Best regards,
Christian.

A friend of mine, who has already made several modifications, told me that he always solves this problem by recoding.

He probably meant adapting the initial amount. Why would a different encoding release a larger initial amount?

Nebelwerfer_TDI wrote:

Why would a different encoding release more initial memory?

Because the software allows for it in some datasets, the starting quantities for the individual codings can actually appear different.
As a result, for example, an engine that has been reconfigured for automatic transmission in a manual transmission vehicle can completely eliminate the usual cold-start problems.
A chip tuner could, for example, copy the "start quantity" parameter from the automatic transmission coding to the manual transmission coding. This would result in a good warm start without the problems associated with incorrect coding, such as permanent error messages or suboptimal engine behavior.

Don't ask me about the meaning of such original software... on that topic, I'll pass it back to Bertil .