Initial IAM Value

User topics relating to software that reflashes or modifes ECU code and data

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Initial IAM Value

Postby Jeramie » Fri Mar 03, 2006 7:02 am

Not sure if this is the right forum (Couldn't really find one that fit). Just wondering if anyone knows how to change the ECU's initial IAM value? Thanks
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Postby NeverLies » Fri Mar 03, 2006 8:32 am

You need to find the adress of this parameter in your ROM and no way to go except dissassembling ;)
Do you know the adress in RAM of IAM for your car ? If so, dissassemble your ROM with IDA and look for reference to this RAM adress, you should find quite fast the initial IAM parameter adress.
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Postby Jeramie » Fri Mar 03, 2006 8:40 am

Good point. I dunno why I didn't think of that, I'll give it a try. Thanks for the input!
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Postby Kha0S » Fri Mar 03, 2006 10:12 am

Jeramie wrote:Good point. I dunno why I didn't think of that, I'll give it a try. Thanks for the input!


Looks like the one for the A4SG900C is at 0x2A2AC... haven't tested it yet, though. :D
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Postby NeverLies » Fri Mar 03, 2006 11:30 am

Right ;) If we use 0x20124 as IAM adress in RAM while monitoring (as laready published by some US users), we can find some routines managing IAM in the AF421 code like this one:
Attachments
iam.jpg
iam.jpg (31.77 KiB) Viewed 10534 times
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Postby Jeramie » Fri Mar 03, 2006 11:37 am

Wow you guys are quick.

To bad we don't have the same ecus :(

Hopefully I will get around to "trying" to take a look. IDApro is not exactly intuitive. :lol:
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Postby Kha0S » Fri Mar 03, 2006 11:40 am

Jeramie wrote:Wow you guys are quick.

To bad we don't have the same ecus :(

Hopefully I will get around to "trying" to take a look. IDApro is not exactly intuitive. :lol:


Jeramie --

What CalID are you running, and what's your IAM address?

I can pull it up in IDA and look for candidates for initial IAM.
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Postby Jeramie » Fri Mar 03, 2006 11:53 am

Kha0S wrote:
Jeramie wrote:Good point. I dunno why I didn't think of that, I'll give it a try. Thanks for the input!


Looks like the one for the A4SG900C is at 0x2A2AC... haven't tested it yet, though. :D


Are you planning on testing?
Jeramie
 
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Postby Jeramie » Fri Mar 03, 2006 11:58 am

Kha0S wrote:
Jeramie wrote:Wow you guys are quick.

To bad we don't have the same ecus :(

Hopefully I will get around to "trying" to take a look. IDApro is not exactly intuitive. :lol:


Jeramie --

What CalID are you running, and what's your IAM address?

I can pull it up in IDA and look for candidates for initial IAM.



AH792
A4TF500F

http://forums.openecu.org/viewtopic.php?t=94
Thats my image.


IAM 0x020120

Thanks, I eperciate it!
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Postby Kha0S » Fri Mar 03, 2006 12:58 pm

Looks like 0x2998D. Can't guarantee it, but try it out. Change it, flash, and pull IAM to see if it's changed.
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Postby Jeramie » Fri Mar 03, 2006 1:04 pm

Cool, I'll give it a try and see what happens. Thanks for your help.


Heads up I sent you a PM.
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Postby Jeramie » Sat Mar 04, 2006 8:57 am

I got a chance to edit the hex and flash the image and it work perfectly. 8) 8)


AH792
A4TF500F

Inital IAM Address = 0x2998D
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