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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

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

2572 Posts

Posted - 02/08/2017 : 03:43:25

You need to power the cluster if you read in-circuit.

Reply #2

mepe

USA
4 Posts

Posted - 02/08/2017 : 15:56:37

I do?

I thought the GQ provided power?

Thanks.

Reply #3

anniel

2572 Posts

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.

Reply #4

mepe

USA
4 Posts

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.

Reply #5

mepe

USA
4 Posts

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).

Reply #6

anniel

2572 Posts

Posted - 02/13/2017 : 03:54:17

Don't forget the runtime always change.

Reply #7

supervizeur