reading block learn values from GM EFI systems?

[Dave Zug]

If you go for a drive, and drive as you normally drive, the BLM cells that
you need to see the most will be logged. The other ones will show up if you
make an attempt to get into their range by accellerating a bit more rapidly,
pulling the shifter down to a numericly lower gear etc.. but those BLM cells
(the less used ones) may have only been visited and updated 2 or 3 times
(compared to thousands) during normal driving.... therefore they will not be
"aged" properly yet.  I don't have a solution to this.. I'm really saying
"it dont matter that much" but if your BLM's are way off in the ranges you
DID see, then you may assume they are waay off in the other ranges too...
but be conservative in the ranges you didn't log.

signed...

Dave
"good-nuff engineering, Inc."   ;-)

PS.. if you wanted to take the absolute "cheapest" way out to extract the
BLM cells.. take the proper voltage source to the address, data lines, and
chip selects of the ECM circuits and extract them one by one, using a meter
or a simple LED circuit with a probe. Gotta figger how to stop the muxs from
cycling thru the lines though.. short the clock oscilator??  gonna hafta
help me there.. I never did it.. just thought of a "free" way to do it this
instant.

flame on...Its all opinion and free flowing thought   ;-\

----- Original Message -----
From: romans, mark <romans at starstream.net>
To: <gmecm at diy-efi.org>
Sent: Thursday, March 08, 2001 6:38 PM
Subject: Re: reading block learn values from GM EFI systems?


> Ross it would be very handy to be able to download these or go in and
> look at them.
> Now I have to use diacom and try and hit all these cells to see where
> the values are.
>
> Mark
>
>
> ----- Original Message -----
> From: "Ross Myers" <ponty at axis.jeack.com.au>
> To: <gmecm at diy-efi.org>
> Sent: Wednesday, March 07, 2001 11:43 PM
> Subject: Re: reading block learn values from GM EFI systems?
>
>
> >
> > > Does anyone know of a way to read/view all of the individual block
> > > learn/fuel trim values for each cell/block that are stored in the
> ECM/PCM
> > > (when retaining block learn values is enabled)? Could this be obtained
> > > through the diagnostic port or copied off of some internal chip?
> > >
> > >
> > > Jason
> >
> >
> > If you know where the Cells are located in memory you can download them
> > either by a Mode2 or Mode3, it is a VERY handy thing to be able to do.
> > If you want specifics, give us a shout.
> >
> > Ross Myers
> >
> >
>
> --------------------------------------------------------------------------
> --
> > To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> > in the body of a message (not the subject) to
majordomo at lists.diy-efi.org
> >
> >
>
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>


----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org