CrossFire/'7747/700R4/4th Gear confusion!

[Ken Kelly]

So, $D007 = $0007 in EPROM then? I haven't put the chip in my car yet,
fortunately!

I was reading the HAC last night and it showed where the ALDL was coming
from; is there a way in EPROM to re-arrange where the data goes? If so, this
could cure the MPG stats on the '84 Vette dash for those who have converted
their '84 Vette to a '7747. (Or maybe I just needed to go to sleep last
night.)

I'll double-check my EPROM again for that value though, and look for it in
$0007 instead.

Ken

-----Original Message-----
From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
Of rr
Sent: Tuesday, July 17, 2001 8:51 AM
To: gmecm at diy-efi.org
Subject: Re: CrossFire/'7747/700R4/4th Gear confusion!



Something just dawned on me. You might be looking at the
wrong location. If this is an auto bin b7 of $D007 should
be 0. You are showing it to be a 1 meaning a stick tranny
and shift light code is enabled.

Since you TCC is working as it (almost) should, wrong
location? In the EPROM it would be location $7. Once
installed into the ECM it becomes location $D007.

BobR.


On Mon, 16 Jul 2001 20:41:39 -0400
 rr <RRauscher at nni.com> wrote:
>
> Yes to the bit flip.
>
> BobR.
> (aka Mr. 747)
>
> Ken Kelly wrote:
>
> > I'm using TunerCat to change the TCC lockup speeds. TCC
> lockup is controlled
> > by two different parameters - one is speed, the other
> is TPS. It locks up
> > and unlocks at defined MPH, both in high and low gears.
> (Four settings
> > total.) There is also a couple of tables for TPS
> settings, that allow you to
> > change the amount of TPS it unlocks at.
> >
> > Where BobR. got the polarity switch number from I have
> no idea!! (But I'm
> > thankful!!)
> >
> > Bob, I looked at that location and I've got a value of
> DE - which turns out
> > to be 222 in decimal and 11011110 in binary (MSB first)
> .. bit 5 is the
> > 11(0)11110 in the byte? Flipping it would put it at
> 11(1)11110 making it 254
> > decimal and FE hex? (Yes/no??)
> >
> > Ken
> >
> > -----Original Message-----
> > From: owner-gmecm at diy-efi.org
> [mailto:owner-gmecm at diy-efi.org]On Behalf
> > Of Louis Baiani
> > Sent: Monday, July 16, 2001 3:46 PM
> > To: gmecm at diy-efi.org
> > Subject: Re: CrossFire/'7747/700R4/4th Gear confusion!
> >
> > Hey Ken,
> >
> > I have two bins for that vehicle, one causing a TCC
> lockup at very low
> > speeds
> > (original), and a replacement from GM.  What are you
> using to change your
> > values?  Do you have a table indicating what is what on
> the bin?
> >
> > Thanks,
> >
> > Louis
> >
> > Ken Kelly wrote:
> >
> > > Okay, I hooked my tattle-tale box up and figured out
> that I wasn't getting
> > a
> > > 4th gear signal from my transmission. At first I
> suspected the tranny, but
> > > once I found some other schematics, I realized that I
> just had it pinned
> > > wrong, so I switched it over to where it *should* be
> (W22) and now I'm
> > > getting a light while in the first three gears. In
> 4th gear, the light
> > goes
> > > off (telling me that it's a normally closed switch.)
> This isn't a problem,
> > > but in TunerCat, I've got my TCC set to lockup at 45
> and unlock at 40 when
> > > in 3rd gear, and lockup at 50 and unlock at 45 in 4th
> gear. Apparently
> > > either the PROM I have is backwards, or TunerCat has
> it backwards, because
> > > in 3rd gear, it won't lockup until 50 (a little too
> high) yet 4th gear
> > locks
> > > up at 45. So my question is - should I find a
> different BIN to work with,
> > or
> > > should I put a relay in the pigtail harness that
> inverts the output from
> > the
> > > transmission? (I really don't want to dig into the
> transmission to swap to
> > a
> > > normally open switch!)
> > >
> > > "The Third" Ken Kelly
> > >
>
>
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