Russell
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| posted on 25/9/09 at 06:46 PM |
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ECU - Any Serial EEPROM experts out there?
I'm tinkering with an OEM ECU for a potential donor engine. Does anyone know if this 24C02:
Image deleted by owner
Is equivalent to a "M24C02-WMN6T"?
I want to reprogram the ECU but I'd rather read the original and write to a spare then fit that to the board rather than risk buggering up the
original. I have some M24C02-WMN6T (also marked 24C026 K810) to hand.
Been out of the hands-on electronics game for too long and I'm struggling to catch up! Got some datasheets but I hoped someone on here might
have an IC equivalent reference source.
I'm a bilingual illiterate. I can't read in two languages.
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02GF74
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| posted on 25/9/09 at 07:40 PM |
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all signs point to that being 24C02 - 2k (256 x 8 bit) EEPROM
I don't recognise the F for manufacturer, not fujistsu nor Fraichild; can't think of
any others off hand.
The letters before and after the generic part will decdoe to thikgs like revision,
voltage, package - the 8 most likely is number of pins.
If you can identify the manufacturer, that would help in locating data sheet then comparing to the devices you have.
Most likely any prorammer for 23C02 device will work.
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craig1410
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| posted on 25/9/09 at 07:48 PM |
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Hi,
Here is a link to the datasheet for the M24C02-WMN6T:
http://www.datasheetcatalog.org/datasheet/SGSThomsonMicroelectronics/mXyyxxz.pdf
It is a 2kbit (256 * 8), 2.5 to 5.5Volt, SO8, -40 to 85C, Tape & reel packaged device.
The 24C02-VM8 in your pic is a Fairchild Semiconductor part and appears to be compatible. It appears to be an SO8, -40 to 125C temp part:
http://willem.engen.nl/projects/DC5xx/FM24C03U.pdf
Logo from here:
http://www.elnec.com/support/ic-logos/manufacturer-description/?manuf=Fairchild
Hope that helps,
Craig.
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turbodisplay
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| posted on 25/9/09 at 07:59 PM |
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What ecu is that, didn`t think they used serial, i bet it uploads its values at the begining, to be stored in the processors ram memorry.
Darren
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Russell
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| posted on 25/9/09 at 08:00 PM |
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Thanks, you guys have been so helpful. I've been Googling for ages and couldn't find the right info.
All systems go for a bit of tinkering as soon as my eeprom programmer arrives! 
I'm a bilingual illiterate. I can't read in two languages.
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trikerneil
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| posted on 25/9/09 at 08:01 PM |
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I'm not really into electronics but would THIS be of
any use?
Neil
ACE Cafe - Just say No.
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02GF74
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| posted on 25/9/09 at 08:01 PM |
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nice one - so it is fairchild.
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Russell
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| posted on 25/9/09 at 08:03 PM |
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quote:
Originally posted by turbodisplay
What ecu is that, didn`t think they used serial, i bet it uploads its values at the begining, to be stored in the processors ram memorry.
Darren
Actually I'm trying to disable the immobiliser on an Audi Bosch ECU circa 1998 vintage. I'll feedback results to the forum in a couple of
weeks' time if anyone's interested?
I'm a bilingual illiterate. I can't read in two languages.
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Russell
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| posted on 25/9/09 at 08:11 PM |
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quote:
Originally posted by Russell
quote:
Originally posted by turbodisplay
What ecu is that, didn`t think they used serial, i bet it uploads its values at the begining, to be stored in the processors ram memorry.
Darren
Actually I'm trying to disable the immobiliser on an Audi Bosch ECU circa 1998 vintage. I'll feedback results to the forum in a couple of
weeks' time if anyone's interested?
Forgot to say - it's for a VAG 1.8T engine.
Russ
I'm a bilingual illiterate. I can't read in two languages.
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02GF74
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| posted on 25/9/09 at 08:15 PM |
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quote:
Originally posted by turbodisplay
What ecu is that, didn`t think they used serial, i bet it uploads its values at the begining, to be stored in the processors ram memorry.
Darren
what microcontroller is used?
chance are the serial contains the engine map - doubt it will contain info, about immobilser but who knows....... ? ? ??
microcontroller will have its own program ROM.
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turbodisplay
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| posted on 25/9/09 at 08:17 PM |
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Putting a blank part (all set to FFFF) or all set to 0000 will probally work as the check sum is incorrect causing an error.
Question is will it fail safe or not.
Darren
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Russell
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| posted on 25/9/09 at 08:21 PM |
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quote:
Originally posted by 02GF74
quote:
Originally posted by turbodisplay
What ecu is that, didn`t think they used serial, i bet it uploads its values at the begining, to be stored in the processors ram memorry.
Darren
what microcontroller is used?
chance are the serial contains the engine map - doubt it will contain info, about immobilser but who knows....... ? ? ??
microcontroller will have its own program ROM.
Apparently the immobiliser code is in the 24C02 and if the code read from the ignition key and instrument cluster don't match the engine will
die after about 2 seconds running. For now I'm just looking to get the engine running on the stock ECU without the cluster or key chip present.
It's a challenge!
I'm a bilingual illiterate. I can't read in two languages.
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sebastiaan
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| posted on 26/9/09 at 07:16 AM |
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The way this is normally done is to hack the code in the engine ecu and at the point where the "check immobiliser routine" stuff starts,
an unconditional jump to the end of the routine is put in place. That way, the ECU will just skip the entire procedure. A "bit" difficult
to do, though....
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MikeRJ
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| posted on 26/9/09 at 11:42 AM |
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The older Bosch Motronic ECUs certainly had the immobiliser information stored in an EEPROM like this. The reason is that it has to be paired with
the immobiliser transponder box, and this is done the first time they are switched on whilst connected. Any time after that the ECU requires the
transponder to send the code it "learnt" when it was first paired.
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oadamo
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| posted on 26/9/09 at 12:40 PM |
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iam looking into doing the same thing but with a 2000+ subaru ecu, as the alarm built in.
adam
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02GF74
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 posted on 23/10/09 at 06:45 AM |
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been 2 months, any progress on this?
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