Help with Porsche 996 M5.2.1 immo off - 24c04

[Remapking]

Hi Guys I am having problems with a Porsche 996 911 - it used to only start if we clear fault codes on ECM (engine blocked by immobiliser) - after clearing DTC it would start. It has now stopped starting at all. I have READ 24c04 and WRITE to a new chip incase it was the problem. Can anyone please help with Immo OFF solution as I really cannot find one. I have attached the original dump from 24c04. Thanks guys

[Remapking]

Does anybody have a solution for this ECU??

[easytech]

What are the fault code's in the Alarm/WFS unit?
Also there is no WFS code in your file. Did you try to virgin it?

[Remapking]

What are the fault code's in the Alarm/WFS unit?
Also there is no WFS code in your file. Did you try to virgin it?

Hi thanks for the reply, no I did not try to virgin - I only copied dump from original 24c04 and write to a new 24c04

no fault codes in alarm/wfs - only P1571 immobilizer - in engine ecu

thanks

[easytech]

Ok part of the Immo code is missing in your dump, so read the 93LC66 in the alarm unit or ask dealer for the immo activation code.

[Remapking]

Ok part of the Immo code is missing in your dump, so read the 93LC66 in the alarm unit or ask dealer for the immo activation code.

Hi I really appreciate your replies, I will read 93LC66 from alarm unit and post dump here asap. Thanks again

[Remapking]

Hi Sorry I know its been a while - however I now have the 93LC66A dump from the alarm unit. I hope you can help, Would really appreciate it :) as someone has now stolen the stereo while the car has been stood standing.

[Remapking]

Hi Easytech, Just pm'd you thanks

[easytech]

I will take a look.

[Remapking]

Thanks buddy :)

[Remapking]

Hi Easytech - sorry to keep bothering you, have you managed to take a look yet?

Regards

[kugglefischer]

this is a hard one to crack......

[Remapking]

Do you have any idea on how to resolve this? Thanks

[easytech]

Send you PM, the checksum is the hard part.
I know where it is and also 2'complement but I still don't know if it is a CRC or just 16bit checksum and which adress are calculated.

[Remapking]

Hi Easytech once again I really thank you for looking at this for me, I assume there is no actual immo off solution for this, I don't have a PIWIS tester. if you have any developments or any solution I can try please feel free to contact me - Thanks

[easytech]

Everything is possible if you now how...:)
Keep looking for the checksum calculation.
I PM'd you the immo and program codes if you have someone with a tester it is just a few minutes work.

[Remapking]

Hi thanks, I will try and hopefully find someone with tester - fingers crossed - thanks you really have been a great help