MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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 Automobile engine ECU, Immo, Air bag chip tunning
 getting all zeroes

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T O P I C    R E V I E W
mepe Posted - 02/07/2017 : 16:32:23
I'm trying to read the AT25020 on the instrument cluster from a 2005 Chevy Astro.

I'm using GQ-4x4 with SOP16/8 DIP8 REV3 adaptor (don't know who made it, don't remember where I bought it but google images shows dozens from several makers and they all look just like mine).

Every time I attempt to read the chip I get all zeroes, every memory location shows 00.

I know that can't be right because I can verify that somewhere in there is the odometer reading which is 171522 and the trip odometer shows 1100.9.

What am I doing wrong?

Thanks.
12   L A T E S T    R E P L I E S    (Newest First)
anniel Posted - 06/09/2017 : 03:06:32
Yes.
supervizeur Posted - 06/04/2017 : 03:15:30
http://www.mcumall.com/comersus/store/comersus_viewItem.asp?idProduct=4310
anniel Posted - 05/29/2017 : 08:43:11
A buffer could help.
supervizeur Posted - 05/29/2017 : 06:43:58
Probably a noise issue.
anniel Posted - 04/15/2017 : 06:32:45
Don't forget to isolate power.
supervizeur Posted - 04/11/2017 : 18:01:40
What is the length of your programming cable?
anniel Posted - 02/13/2017 : 03:54:17
Don't forget the runtime always change.
mepe Posted - 02/12/2017 : 14:03:56
Not so as it turns out.

When I power it up, it won't display (which doesn't matter much) and I can't get a read of the chip -- or, rather, I get numerous reads of the chip, each one different.

What made it work was reducing the speed to -2 (may not have to go that far down but that worked).
mepe Posted - 02/09/2017 : 08:22:12
Ah!

I can unsolder the chip "easily" enough but it's easier to power the cluster, so that's what I'll do.

Thanks.
anniel Posted - 02/09/2017 : 03:32:36
Yes, but not enough to power up the whole cluster. If you unsolder the chip you'll be fine.
mepe Posted - 02/08/2017 : 15:56:37
I do?

I thought the GQ provided power?

Thanks.
anniel Posted - 02/08/2017 : 03:43:25
You need to power the cluster if you read in-circuit.

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