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View Full Version : Audi A8 witch eprom for chiptuning 0 261 204 146/147. 4D0 907 557 J (m5.4)



mr nox6
17th March, 2018, 12:46 PM
Hi,

i have an old rally car overhere Audi A8 4.2 ABZ 0 261 204 146/147. 4D0 907 557 J

we want to delete all error codes and chiptune.

i think its a bosch motronic M5.4

can anybody tell me witch Eprom i need to take off or can re program?

best regards

jasper

eepromdom
17th March, 2018, 12:53 PM
Hi,

i have an old rally car overhere Audi A8 4.2 ABZ 0 261 204 146/147. 4D0 907 557 J

we want to delete all error codes and chiptune.

i think its a bosch motronic M5.4

can anybody tell me witch Eprom i need to take off or can re program?

best regards

jasperThe flash eeprom dude... Send a pic of the board and ill I.d the flash for you... I know of 3 versions I've worked with before... 200bb/400bb flash...

Sent from my LG-H850 using Tapatalk

mr nox6
17th March, 2018, 01:11 PM
The flash eeprom dude... Send a pic of the board and ill I.d the flash for you... I know of 3 versions I've worked with before... 200bb/400bb flash...

Sent from my LG-H850 using Tapatalk

ok, i hope this pic is good enough.

eepromdom
17th March, 2018, 01:20 PM
ok, i hope this pic is good enough.Okay... Its the older spec than I'm used to...its this one bud... What's the number under the sticker? Looks like a 27c1024?https://uploads.tapatalk-cdn.com/20180317/d9bf552458bef6ba1c26bcbec6116d12.jpg

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mr nox6
17th March, 2018, 01:58 PM
This is underneath the sticker

eepromdom
17th March, 2018, 02:23 PM
This is underneath the stickerI'm looking on my masksets numbers list here... B58548 it says is a tms 27pc210 plcc 44 which is the same as a 27c1024 plcc 44... So yeah... That's the one... You can read and write it as a 27c1024... They are one time programmable tho... So you can read it.... Edit the info and remap it to your liking and then you will need to write it onto a blank eprom.... Hope that helps you... I think sst might make a eeprom that can be erased and rewritten? But Texas instruments definitely are not rewritable...good luck.. I know manyvery good guys on this forum that can remap nicely for you... Buy a couple of chips and try a few maps... Or a rewritable one you can erase and rewrite...

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mr nox6
17th March, 2018, 02:30 PM
this is good info,

thanks a million.

will try to re program it.

mr nox6
26th March, 2018, 07:10 AM
new update,

finally i got the same eprom.
1 ordered 5 of them just to be sure that i had enough, because i can write them once.

so i read out the original one, and copied the data to new chip.
i soldered a socket onto the print, so can switch eproms fast.

here's the strange thing, when i mound the original chip the enging runs.
when i use the cloned chip i have no communication with engine ecu and car won't start.
when i switch back to original chip, all is fine.

tryed to write another chip, same error.
reading and writing was with minipro 6.6

any thoughts on what i did wrong?