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.
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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. |