Problem with read EEPROM 93c46 Peugeot 406 IMMO

**AlimK** · 3rd February, 2023, 09:02 PM

Hello, I have a problem with reading of 93c46 (B58097) DIP 8 eeprom. I read with MCUmall GQ 4X but in .bin file (buffer) I show only F9 F9 (see picture below). I try to read another eeprom from another peugeot 406 same chip (B58097) and same reading.

ff.jpg

When I try to read NEW EEPROM 93c46, reading is FF FF (see picture)
fff.jpg

I am confused what a happend, have a problem with programmator and not correct reading, or EEPROM is faulty?
Please help, thanks !

**Ninjor s** · 3rd February, 2023, 09:32 PM

Originally Posted by AlimK

Hello, I have a problem with reading of 93c46 (B58097) DIP 8 eeprom. I read with MCUmall GQ 4X but in .bin file (buffer) I show only F9 F9 (see picture below). I try to read another eeprom from another peugeot 406 same chip (B58097) and same reading.

ff.jpg

When I try to read NEW EEPROM 93c46, reading is FF FF (see picture)
fff.jpg

I am confused what a happend, have a problem with programmator and not correct reading, or EEPROM is faulty?
Please help, thanks !

remove eeprom from board read with programmer and clean legs of chip.

**AlimK** · 3rd February, 2023, 09:50 PM

I did it! I don't now why dump is with F9F9F9, maybe this is a problem? Programator GQ 4x is the problem or faulty EEPROM chip 93c46?

**Ninjor s** · 3rd February, 2023, 10:17 PM

try other programmer...............

**AlimK** · 3rd February, 2023, 11:05 PM

I writed New eeprom 93c46 and read again, no problem writing is correct and after that reading is correct.
So maybe the main issue is in eeprom's faulty/defected.
Tomorrow I will try the solution and give you feedback.

**simplo** · 4th February, 2023, 08:57 AM

Or the first programmer is damaging eeprom content

**Zmann** · 4th February, 2023, 12:58 PM

Does your programmer support 93S46 (93CS46) ? B58097 is 93S46 !

**rafal** · 4th February, 2023, 01:02 PM

Originally Posted by Zmann

Does your programmer support 93(c)S46 ? B58097 is 93S46 !

it is like users using only one programmer and playing with cars

**AlimK** · 4th February, 2023, 09:18 PM

Originally Posted by Zmann

Does your programmer support 93S46 (93CS46) ? B58097 is 93S46 !

Thank you! I try to read like as M93S46 and I read the correct dump. This is the file. So I will try to immo off, from my undesrtood just put "zeros" (00) in first 6 8bit possitions. I will try and give the solution.
P.S: I tried with desolder EEPROM but not work!

Original dump from EEPROM:

**Zmann** · 5th February, 2023, 03:11 AM

(my reply to the PM) Checking the dump might not be that easy to find the corrupted byte(s). And also they are all too old. Your target was already Immo Off ? My all eep dumps are here, try them yourself, some is already off, for the rest you knew how simply to do it yourself too.