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

[Ken Kelly]

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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