[Gmecm] Torque converter clutch on 1226869

[David Allen]

  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
>
>
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