[Diy_efi] Torque converter clutch on 1226869

[Tom Visel]

Test light to check a driver circuit?  Glad it's your ECM and not mine.  
Any idea exactly how much current the lamp draws?

To eliminate the possibility of a 4th gear switch or some other problem 
in your trans, you could connect your DVOM to the TCC output and monitor 
it while driving.  It should be close to charging system voltage while 
going down the road unlocked, and then less than a volt when the TCC is 
applied.  If it never sees 12V (or charging system voltage,) you have a 
power supply, wiring harness, or high-gear-switch problem.  If it never 
drops to less than a volt, you have an ECM problem.

TomV


Rick McLeod wrote:

>Are you reasonably certain the drivers on the ECM board are good, maybe that you're doing all right and have hardware issue?
>
>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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