CarProg not r/w any eeprom, how to solve?

**jodank** · 7th July, 2019, 07:42 PM

Hi!
I have a CarProg who is doing well job but can't deal with any eep.

I read many many many posts here and other places too does people changed the IC 74HCT125D to some
sort of 74HCT125M etc. and they managed the problem.
This is really strange to me, cos the letter M has nothing to do with the functionality of the IC.

From some other sources they changed it from HCT to HC or HC to HCT version of IC.
This makes sense cos one is TTL and the other is CMOS compatible IC.

D or M version has nothing to do with the part functionality, it is a marking for SO package.

SO, my question is to experienced technicians here, which type of this IC is in the original version?
In my case, I have HCT125D version, 4 of them.
Is in the original CarProg the HC version?

Thank you.

**lucaslacerda** · 7th July, 2019, 11:43 PM

Originally Posted by jodank

Hi!
I have a CarProg who is doing well job but can't deal with any eep.

I read many many many posts here and other places too does people changed the IC 74HCT125D to some
sort of 74HCT125M etc. and they managed the problem.
This is really strange to me, cos the letter M has nothing to do with the functionality of the IC.

From some other sources they changed it from HCT to HC or HC to HCT version of IC.
This makes sense cos one is TTL and the other is CMOS compatible IC.

D or M version has nothing to do with the part functionality, it is a marking for SO package.

SO, my question is to experienced technicians here, which type of this IC is in the original version?
In my case, I have HCT125D version, 4 of them.
Is in the original CarProg the HC version?

Thank you.

Try to program with minimun 5A current. Many ecus need 3.9A to program...

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**jodank** · 8th July, 2019, 07:09 AM

This carprog can't r/w any eep even if the eep is not in-circuit...

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**jodank** · 13th July, 2019, 10:32 PM

After changing the 4 74HCT125D to 74HC125D the same problem exist.
CarProg can't read the 93xx eep's.
When I try to read the 93C46 or any other type of 93xx eep I get a msg "No chip Detected!" but the relay is clicking.
Any idea what could be the reason for this?

The version of CarProg I use is 10.05.
I have also a lower version 9.31 but the same problem.

Btw. I really don't understand why should an ecu use 5A current on the bench for in-circuit programming?
5A is so much current, what can eat up in a disconnected ecu 5A current on the bench??

For me, if an ecu is using 5A or more when it is powered on on the bench, that ecu hase is in real trouble, or I missing something?

Thanks for any advice.
My best regards.

**rybenz** · 17th July, 2019, 04:42 PM

Originally Posted by jodank

Hi!
I have a CarProg who is doing well job but can't deal with any eep.

I read many many many posts here and other places too does people changed the IC 74HCT125D to some
sort of 74HCT125M etc. and they managed the problem.
This is really strange to me, cos the letter M has nothing to do with the functionality of the IC.

From some other sources they changed it from HCT to HC or HC to HCT version of IC.
This makes sense cos one is TTL and the other is CMOS compatible IC.

D or M version has nothing to do with the part functionality, it is a marking for SO package.

SO, my question is to experienced technicians here, which type of this IC is in the original version?
In my case, I have HCT125D version, 4 of them.
Is in the original CarProg the HC version?

Thank you.

Which connector type of Carprog do you used to read the eeprom?.
Maybe your connector cable is bad.
In case "no chip detected" mean the Carprog device is lost connection to the eeprom chip.

**jodank** · 17th July, 2019, 06:17 PM

I use the A4 adapter.
Compared and checked the A4 adapter with the schematic from the manufacturer. Looks good without any problem.

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**Panathaole** · 17th July, 2019, 10:39 PM

Download a carprog reworked photo and
Check your parts on PCB,
After replace in mine carprog the mentioned chips with branded new, my carprog reads - writes much better the eeproms chips (before can't read many of them) I also replace some capacitors if I remember well...

But always I manage to read a few....

Maybe you have a problem in your hw...

**jodank** · 19th July, 2019, 06:54 PM

How accurate is the A9 adapter?
I checked my carprog with and the test result passed.
The hardware should be ok following the A9 adapter test result.

But still not working with 93xx eeps...

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**Panathaole** · 19th July, 2019, 09:48 PM

You test it only in one eeprom? (93xxx)?

it reads fine the other type of eeproms?

**jodank** · 19th July, 2019, 10:00 PM

Yes.
I tested other type of eeps and others are r/w prefect.

Also tested with several 93xx.
Some time I can read lets say 93C46 as 93C56 but most of time "No chip detected"....
Completely unstable on use for 93xx.

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