[Gmecm] Torque converter clutch on 1226869

[David Allen]

Just remembered something - the scan data never indicates the ECM is
attempting to actuate the TCC output. I would think the scan data would
still show the CPU attempting to turn the output ON whether or not the
output driver really did anything.
David


>   Dennis;  the ECM is a reman unit purchased for a MAF to 2-bar
> speed-density swap.  I have never seen this output work on this ECM.  The
> diagram shows the TCC on pin A.7 on the ECM.  Will inspect the connector
> again.
>   The TCC does work and I have a manual switch for temporary use.
>   I will open the ECM and look for any burned parts. I'm beginning to
think
> along the same lines you are about that being a dead output. :-(
>   Thanks,
> David
>
>
>
>
> > David,
> > Has the TCC output ever worked?  It might be a dead
> > output bit on the ECM.  Try adding a switch to ground
> > to the output so you can switch the TCC on manually.
> > Dennis
> >
> > --- David Allen <davida1 at hiwaay.net> wrote:
> >
> > >   I'm playing with my 6869-controlled turbo car, and
> > > trying to get the ECM
> > > to control the torque converter clutch.  It seems
> > > there are no numbers I can
> > > put in the calibration which will actuate the TCC
> > > output.
> > >   I have a test light on the TCC ouptut at the ECM
> > > to emiminate any other
> > > external factors.  Some things I have verified:
> > >
> > > Scan data shows the trans in "Drive"
> > > Scan data shows coolant is hot.
> > > Scan data indicates vehicle speed; and is reasonably
> > > correct.
> > > Scan data indicates TPS is working; and is
> > > reasonably accurate.
> > > No DTC's present.
> > > "Automatic Transmission" is selected in the ECM
> > > calibration.
> > > Test light does work when manually grouned.
> > >
> > > I have tried putting very "loose" boundaries in the
> > > ECM to make it lock up
> > > most of the time but can't get it to illuminate the
> > > light.  No combination
> > > of road speed and throttle position will make it
> > > actuate. The schematic does
> > > not indicate any high gear switch on this ECM. What
> > > can I be overlooking?
> > > Thanks in advance,
> > > David
> >
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Tired of spam?  Yahoo! Mail has the best spam protection around
> > http://mail.yahoo.com
> > _______________________________________________
> > Gmecm mailing list
> > Gmecm at diy-efi.org
> > http://lists.diy-efi.org/mailman/listinfo/gmecm
> >
>
> _______________________________________________
> Gmecm mailing list
> Gmecm at diy-efi.org
> http://lists.diy-efi.org/mailman/listinfo/gmecm
>