NefMoto > Technical > Cluster and Immobilizer (Moderator: ddillenger) > ME5.9.2 IMMO OFF. 24C02 is a little weird though
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Author Topic: ME5.9.2 IMMO OFF. 24C02 is a little weird though  (Read 25239 times)
MK2-VRT
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« Reply #15 on: October 08, 2013, 03:17:35 AM »
Look at the differents in my file, there is not always A0, in this ecu you see 1x A0 and 1xFF..Change it simply to 50.

Regards,
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eliotroyano
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« Reply #16 on: October 08, 2013, 07:38:42 PM »
Quote from: MK2-VRT on October 08, 2013, 03:17:35 AM
Look at the differents in my file, there is not always A0, in this ecu you see 1x A0 and 1xFF..Change it simply to 50.
Regards,

I have investigating and find that it is right that 0x000C & 0x006C:A0 --> immo on, changing it to 50 --> makes immo off. But the issue is when we should make a checksum correction add/substract in locations 0x000E/0x000F & 0x0006E/0x0006F or just change location 0x000E & 0x006E with "9E". Check out the attached dump of a 06A906018AQ ecu.
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MK2-VRT
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« Reply #17 on: October 09, 2013, 03:16:02 AM »
Test it..

First is off ( 50 - 9E )
Second is 50 + Calc sums
Last one is a working off file for 06A 906 018 AQ
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eliotroyano
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« Reply #18 on: October 09, 2013, 05:15:41 AM »
Quote from: MK2-VRT on October 09, 2013, 03:16:02 AM
Test it..
First is off ( 50 - 9E )
Second is 50 + Calc sums
Last one is a working off file for 06A 906 018 AQ

MK2-VRT I don't have the ECU but the last file is the Immo OFF file that I used in the past. I saw that many of the dumps that starts with 12 68 30 works with 50 + Calc Checksums and others that doesn't start that way uses 50 + 9E.
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terminator
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« Reply #19 on: October 22, 2013, 08:38:47 AM »
Could anyone tell me please how to read 24C02? I understand that via programmer, I'm using Xeltek but it always shows that 7 pin is not inserted (but it inserted for sure).
I read 24c04, 95040, 95p08, 29F800(400,200) before without any problems.
Actually I dont know what name of manufacture that produce this 24c02. Maybe thats the problem or maybe 24c02 was damaged...

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MK2-VRT
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« Reply #20 on: October 26, 2013, 06:48:16 AM »
A 24C02 you read the same as the 24C04.

Sure that hes make good contact on all the pins ?

And is it a 24C02 or you see another no on the eeprom ?
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terminator
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« Reply #21 on: October 27, 2013, 08:00:42 AM »
Pretty sure all contacts are ok.
But! Its a 24C02VM8 eeprom. I dont know what VM8 means. I choose as 24c02 into programmer soft, cause there is no 24c02VM8.

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f1torrents
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« Reply #22 on: October 27, 2013, 10:22:24 AM »
Trying to read with a clip on the board is hit and miss even with a good 3M clip.
Best to remove it and read/write.

Works 100%
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eliotroyano
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« Reply #23 on: October 27, 2013, 12:40:40 PM »
Quote from: f1torrents on October 27, 2013, 10:22:24 AM
Trying to read with a clip on the board is hit and miss even with a good 3M clip.
Best to remove it and read/write.
Works 100%

I have tryied shorting XTAL to avoid MCU starts and also lifting VCC of 24C02 with some mixed results, but if the IC is good for sure, removing it should work 100%.
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terminator
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« Reply #24 on: October 27, 2013, 03:45:15 PM »
I tried to read it with a clip too, but it read only 00 00 00 etc. (empty file)
Then I removed it and soldered to soic8 adapter directly. Checked my soldering one more time. But my programmer still shows that 7 pin wasn't inserted.
Maybe smth wrong with the chip.
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Aragorn
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« Reply #25 on: July 22, 2014, 05:17:50 AM »
Quote from: MK2-VRT on October 09, 2013, 03:16:02 AM
Test it..

First is off ( 50 - 9E )
Second is 50 + Calc sums
Last one is a working off file for 06A 906 018 AQ

As a FYI to anyone like me who happens across this thread, the file up there labelled as 018AQ immo off has something wrong with it, which results in an EEPROM checksum error.

See my thread here for a working file:

http://nefariousmotorsports.com/forum/index.php?topic=6382.0title=
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