W210 EGS52 help change ratio to 2.87 from original EEPROM

Post #1

Boozy

Boozy

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Hello everyone!Please help me recalculate my original factory EEPROM file for a Mercedes W210 EGS52 TCU. The car is a W210 sedan, and I have installed a new rear axle with a 2.87 gear ratio.I tried to modify the AA 22 variant coding string manually in a HEX editor, but the TCU goes into a hard limp mode (stuck in 2nd gear) when the car starts moving. It seems there is a global checksum or offset mismatch.I have attached my clean, untouched, original factory EEPROM file (.bin) read via K-Tag on the bench. Could someone please modify this original file correctly for a 2.87 axle ratio and recalculate all necessary checksums so the gearbox works without limp mode?Thank you very much in advance!
 

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Post #2

this long coding for egs52 2.87 ratio with fixed chks
617134300B05000601070F253A3A00030202050000010000008200001B04360BE803E803CB072C000D8F

try it
 
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Post #3

this was ori (not yours, from other topic)- 617134300B05000601070F253A3A00030202050000010000008200001B045A0AE803E803CB072C00C39E
What we see...
for changing it ro 2.87 , its changed in bytes (in red - ratio, near is for 2.87) , (blue - checksum , as can calc , its definately CRC-16-IBM , Reversed 0xA001)
1791313812901.webp


So, you can just try full this string (BACKUP YOURS!!!) , or just simply modify yours . Read your long coding , find exactly same place bytes , change to "360B" , copy ALL string EXCEPT LAST 2 Byres (its checksum itself) . then re-calc it by CRC-16-IBM Reversed, past it to last 4 digits. You will get all your configs only ratio change .
Welcome.
 
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Post #4

blackd said:
this was ori (not yours, from other topic)- 617134300B05000601070F253A3A00030202050000010000008200001B045A0AE803E803CB072C00C39E
What we see...
for changing it ro 2.87 , its changed in bytes (in red - ratio, near is for 2.87) , (blue - checksum , as can calc , its definately CRC-16-IBM , Reversed 0xA001)
View attachment 9722

So, you can just try full this string (BACKUP YOURS!!!) , or just simply modify yours . Read your long coding , find exactly same place bytes , change to "360B" , copy ALL string EXCEPT LAST 2 Byres (its checksum itself) . then re-calc it by CRC-16-IBM Reversed, past it to last 4 digits. You will get all your configs only ratio change .
Welcome.
Click to expand...
Thank you
 
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