Please Help Mercedes C250D W202

[ernesto1670]

Hi dk `s
I have a dashboard of a Mercedes C250D (W202)
93C66 EPROM
I need to schedule 157952 km, and not how.
I have information that are at 0000 km and 0010 but did not accord with reality



Thanks for the help.

[ovi_dk]

Here its your good file!
B.R

[pepi]

Here is the location of km that you need to know.

[cokolo]

Here you are

[ernesto1670]

Thank you very much for answering so quickly.
Now there was a problem I did not expect.
When I program the 93c66 (UPA) the whole process done correctly, but when I read the 93c66 is with the old values***8203;***8203;, not save the changes.
This is a 14-pin 93c66 (there is something I do not know?)
thank you very much

[cokolo]

Try to connect
eeprom 93c56 SMD - 14pin

DIP-8 DIP-14
1 - 2 = CS
2 - 3 = CLK
3 - 5 = DI
4 - 6 = DO
5 - 9 = VSS (GND)
6 - 10 = PE
7 - 12 = PRE
8 - 13 = VCC

[ernesto1670]

cokolo, this is how I have it connected.
Is the same scheme that comes in the help of upa

It's funny ....
Erase the EPROM, and reading, reading is FFFFFFFFFFFFFFF ...
Program the EPROM with the new file, and rereading, reading is the initial, do not save the changes. As if not erased.

[cokolo]

Maybe your upa is not good tool for writte "old" 14pin eeprom , I have Seeprog(original) and Galep4+ (original) and never faild these eeprom .

[ernesto1670]

My upa is original, never had a problem, but on this occasion. I'll try to find some answer to the problem.
thank you very much cokolo

[cokolo]

Do you read eeprom on bord or desolder ? I always desolder eeprom and read .

[lati]

on board reading and writing you must Short the quartz

[ernesto1670]

After seeing it was almost impossible that they can not do this job well, review the connections. There was a bad connection, then everything worked fine.
Work schedules two (Cokolo and ovi_dk), only a small change in km.

Finally everything is ok, Thank you all.