nemitom
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« on: March 09, 2020, 10:53:50 AM »
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Hello all,
Looking for algo for EDC15 eeprom (VIN - CRC).
Can anyone help?
e.g.
VIN is TMBFP21U138669631
VIN to hex : 54 4D 42 46 50 32 31 55 31 33 38 36 36 39 36 33 31
CRC : "82"
how to calculate crc?
Thanks all
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H2Deetoo
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« Reply #1 on: March 10, 2020, 10:17:59 AM »
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It is not encrypted. It is just a hexadecimal representation of ASCII characters..
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nemitom
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« Reply #2 on: March 10, 2020, 11:14:14 AM »
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I'm not saying it's encrypted. But how to calculate CRC?
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cherry
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« Reply #3 on: March 10, 2020, 11:36:35 AM »
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EDC15 eeprom crc? Sure? And even if there is a checksum, i would not expect it to vin range only, but for some block.
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nemitom
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« Reply #4 on: March 10, 2020, 02:39:15 PM »
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really.... crc only VIN and Immo ID....
if not correct "crc", ecu delete vin nr. and write all "x".....
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H2Deetoo
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« Reply #5 on: March 11, 2020, 01:58:49 AM »
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Most likely the checksum is just an addition, subtraction, maybe result inversed or a XOR.
Finding the range is important.
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cherry
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« Reply #6 on: March 11, 2020, 07:10:24 AM »
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1 min google is enough to find solution for your problem. There are enough free tools for this. If you cannot find it just upload eeprom and new vin.
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nemitom
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« Reply #7 on: March 11, 2020, 12:31:54 PM »
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to cherry:
I don't want to edit the file .... I want to know how ... finding algo
to H2Deetoo:
I am aware of it, I was hoping that someone knows the way ... I have been solving it for a while and I have no solution ....
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cherry
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« Reply #8 on: March 11, 2020, 01:18:29 PM »
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Then download some simple EDC15 tool and figure out how it works with several tests. Maybe take a look to ME7 eeprom checksum also to get a starting point of understanding, there is description in board somewhere.
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nemitom
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« Reply #9 on: March 12, 2020, 05:20:15 AM »
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Solved thanks!!
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nyet
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« Reply #10 on: March 14, 2020, 06:01:04 PM »
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Solved thanks!!
And the solution was? |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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nemitom
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« Reply #11 on: March 15, 2020, 03:03:34 AM »
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Very simple.... Xor all VIN byte and one constant.... for immo id ( SKZ) is same way, just other constant....
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H2Deetoo
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« Reply #12 on: March 18, 2020, 03:12:22 PM »
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Nice!
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