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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mepe

USA
4 Posts

Posted - 02/07/2017 :  16:32:23  Show Profile  Reply with Quote
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.
Reply #1

anniel

834 Posts

Posted - 02/08/2017 :  03:43:25  Show Profile  Reply with Quote
You need to power the cluster if you read in-circuit.
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Reply #2

mepe

USA
4 Posts

Posted - 02/08/2017 :  15:56:37  Show Profile  Reply with Quote
I do?

I thought the GQ provided power?

Thanks.
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Reply #3

anniel

834 Posts

Posted - 02/09/2017 :  03:32:36  Show Profile  Reply with Quote
Yes, but not enough to power up the whole cluster. If you unsolder the chip you'll be fine.
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Reply #4

mepe

USA
4 Posts

Posted - 02/09/2017 :  08:22:12  Show Profile  Reply with Quote
Ah!

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

Thanks.
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Reply #5

mepe

USA
4 Posts

Posted - 02/12/2017 :  14:03:56  Show Profile  Reply with Quote
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).
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Reply #6

anniel

834 Posts

Posted - 02/13/2017 :  03:54:17  Show Profile  Reply with Quote
Don't forget the runtime always change.
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Reply #7

supervizeur

462 Posts

Posted - 04/11/2017 :  18:01:40  Show Profile  Reply with Quote
What is the length of your programming cable?
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Reply #8

anniel

834 Posts

Posted - 04/15/2017 :  06:32:45  Show Profile  Reply with Quote
Don't forget to isolate power.
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Reply #9

supervizeur

462 Posts

Posted - 05/29/2017 :  06:43:58  Show Profile  Reply with Quote
Probably a noise issue.
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Reply #10

anniel

834 Posts

Posted - 05/29/2017 :  08:43:11  Show Profile  Reply with Quote
A buffer could help.
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Reply #11

supervizeur

462 Posts

Posted - 06/04/2017 :  03:15:30  Show Profile  Reply with Quote
http://www.mcumall.com/comersus/store/comersus_viewItem.asp?idProduct=4310
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Reply #12

anniel

834 Posts

Posted - 06/09/2017 :  03:06:32  Show Profile  Reply with Quote
Yes.
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