Is JTAG disabled on ECUs?

Tools used for ECU reading and writing

Is JTAG disabled on ECUs?

Postby tmcdiscor » Thu Jun 29, 2023 12:56 pm

I was wondering if I can clone data using the JTAG interface in the Tricore Infineon TC1762, my ECU model is MEG17.9.12. I cannot really afford buying a K-TAG hardware or KESS.

So, do you think the JTAG interface was disabled? if so, how can reopen it, unless it's disabled permanently

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Re: Is JTAG disabled on ECUs?

Postby Shooting » Thu Jun 29, 2023 1:19 pm

tmcdiscor wrote:I was wondering if I can clone data using the JTAG interface in the Tricore Infineon TC1762, my ECU model is MEG17.9.12. I cannot really afford buying a K-TAG hardware or KESS.

So, do you think the JTAG interface was disabled? if so, how can reopen it, unless it's disabled permanently


It's BDM not J-Tag, also you need Bootmode for reading



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Re: Is JTAG disabled on ECUs?

Postby tmcdiscor » Thu Jun 29, 2023 1:47 pm

Shooting wrote:It's BDM not J-Tag, also you need Bootmode for reading


Is that what the K-Tag uses in their hardware?, I couldn't find resources on BDM, can you please provide me with some.

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Re: Is JTAG disabled on ECUs?

Postby tmcdiscor » Thu Jun 29, 2023 2:09 pm

Shooting wrote:It's BDM not J-Tag, also you need Bootmode for reading


I know that they uses KTAG, but my initial question is why they don't use JTAG instead? did the manufacturer put limitations on the use of that protocol ?

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Re: Is JTAG disabled on ECUs?

Postby Shooting » Fri Jun 30, 2023 12:48 pm

tmcdiscor wrote:
Shooting wrote:It's BDM not J-Tag, also you need Bootmode for reading


I know that they uses KTAG, but my initial question is why they don't use JTAG instead? did the manufacturer put limitations on the use of that protocol ?


JTag is a very different thing, ECU's don't have JTag
What you think is JTag is actually a BDM port



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