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

[Louis Baiani]

Now does anyone have info on the original ECM's table, and not the 747..

Louis

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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