[Diy_efi] Continuing the chip switcher problem

[David Cooley]

I think it all depends on how the ECM is accessing the chip...
I know this wasn't a problem on GM's at least thru 95...


On Thu, 2005-02-10 at 18:46 -0500, mbelloli at speedymotorsports.com wrote:
> Hello Everyone,
>      I had asked the question eariler in regards to creating a mulitple
> bank chip switcher for an ecm.  Everyone basically said I should be
> able to just switch the chip without any regard for whether the chip
> is being accessed during the switch.  I finally got my pic chip
> controller up and running.  I'm running at 20mhz, and when I do a
> switch I'm still getting a check engine light.  2 out of three times.
>  Thinking about this, I put the same exact bin in each of the banks
> of the chip, and still get the same response.  Could it not be that
> I'm switching in the middle of a read, and that is causing this
> problem???  What does everyone think.  If I turn the car off, and do
> the switch no problem.  I'm using this on a 1991 acura integra....had
> a 27c256 as the base chip, and I'm using a 29c010 as the replacement.
>  I'm controlling the highest two address lines as bank select for a
> total of 4 banks.
>      I'll put the info for chip changer on my webesite, and add a link to
> it tonight.
> 
>      Any ideas???
> 
> Thanks,
> 
> Marcello
> 
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