Originally Posted by
Shrek
OK - a couple of things.
In the HPT Scanner, your displayed speed will be zero - as long as the TCM is on the communications line. If you do away with the TCM, the displayed speed would be 158 MPH.
The solution to this issue has been posted many times - you have two options.
Option #1:
As Blindsquirrel highlighted in post #4.
Keep the TCM in use, and on the communications line. Provide the TCM with a pulsed speed signal - which is what it is expecting.
Option #2:
Remove the TCM and all associated wiring.
Reprogram the ECM with a manual transmission calibration. Provide the ECM with a pulsed speed signal - which is what it is now expecting.