Mandatory TC Lockup

[steve ravet]

> >> Mine is 89 TPI code (vette, I think) I use in my 87 IROC w/ 700R4 that I
> >> got from Terry K.
> >> IIRC, Tim has a 90 IROC with 700R4
> >> >There are tranny configures that might also explain it.
> >> >ie overheat switch, as I recall forces a TCC lock up in some stuff.
> >> I doubt thats the problem...
> >
> >ESQQQs me, but I've seen similiar things happen, so I don't rule out
> >anything til, I know for sure.

If I recall correctly, from the service manual I have for a  '91
Caprice, the temp related lockup happens internal to the transmission. 
ie if the 4th gear switch is closed, and if the temp is too high, then
the TCC solenoid is internally grounded.  Has nothing to do with the
computer.  So if you have a scan tool and you see that the TCC is locked
up when the ecm isn't commanding it then it may be temperature. 

--steve

-- 
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com
----------------------------------------------------------------------------
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