TSS or Turbine Speed Sensor, works in conjuction with the Tachometer.
When the Torque Converter locks up, the computer compares Engine RPM to Turbine RPM.
If the two are equal, then the Torque Converter is locked 100%.
Since the Torque Converter can be modulated by the computer,
when the computer commands lock up and it doesn't get 100% lockup,
the readings between these two sensors will cause you to get these errors.
If the computer commands 67% lockup and the difference between
the RPMs isn't within 67% you get this code as well.
The Torque Converter Clutch solenoid will give you an OFF error
if the Torque Converter is commanded to LOCK and nothing happens at all.
If the Solenoid is shorted or open, you should get an out of range error.
If no error, then assume your wiring is good. and the solenoid is just not functioning.
The solenoid can be replaced without removing the tranny.
You may have to remove the Radiator to give you enough room
to take off the side pan from the CD4E.
