747 swap - TCC control using kick down output from ECM

Sun Aug 22 02:51:35 GMT 1999

Shanene, 

let me complete fil in the details i didn't provide earlier.

The TCC circuit will be wired as follows:

B+ to brake (TCC) switch open when brake pedal is depressed

brake pedal to N.O. relay contact (to be verified after installation)

relay output to trans.

The internal wiring/pressure in the trans. prevents L/U from occuring unless the trans. is in 3rd gear.

/Marc

----------
From: 	Shannen Durphey[SMTP:shannen at grolen.com]
Sent: 	August 21, 1999 5:43 PM
To: 	gmecm at efi332.eng.ohio-state.edu
Subject: 	Re: 747 swap - TCC control using kick down output from ECM

CSH-HQ wrote:
> 
> Look at the wiring, and application, then order a stock gm chip for that
> application.
> Bruce
> 
> >I was trying to avoid messing with the s/w as I don't have easy access to a
> EPROM burner ( not yet anyway).

But the software is the difference.  Rewiring the relay provides
constant 12V to the tcc, and only disengages it during WOT.  Imagine
moderate downshifts with tcc locked up, coming to a stop with tcc
applied, climbing steep grades with tcc locked up, putting car into
gear with tcc locked up.  I don't know if the hydraulic controls allow
the last one to happen, but everything will be really bizarre with
almost constant power applied.  If you're short the money for the chip
(and that doesn't bode well for the rest of the swap), find out if you
can run this trans with tcc disconnected and go that route.  You'd
save yourself a world of driveability problems by not wiring the tcc
on 90% of the time.  Even a manual control switch is better than the
reverse relay trick.  That's my $.02 worth.
Shannen

> >
> >----------
> >From:  CSH-HQ[SMTP:nacelp at jvlnet.com]
> >Sent:  August 21, 1999 8:46 AM
> >To:    gmecm at efi332.eng.ohio-state.edu
> >Subject:       Re: 747 swap - TCC control using kick down output from ECM
> >
> >Personnallly I reconfigure it to the actual gm way, then in 4 years if a
> >problem arose, at the corner of walk and don't walk, after havig a 6 pac,
> >you would still just need to read the book.
> >Bruce
> >
> >
> >>Hi all,
> >>
> >>I'm preparing to swap a TBI 305 (~'89) out of a full size pickup into a
> >>Malibu using a wiring harness from a full size G van '88. The van used a
> >>TH400 that needed an output to energise the kick down solenoid via a relay.
> >>The target vehicle uses aTH350C (L/U TCC) that needs +12 during cruise just
> >>the opposite of what the kickdown output supplies.
> >>
> >>Can anyone think of a good reason if I flipped the relay output so it
> >>provided +12 during cruise intead of +12 @ WOT this would not work properly
> >>?
> >>
> >>/Marc
> >>
> >>Note the orginal Pickup harness was butchered before I got the engine.
> >>

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