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Transmission overheat trouble

I know it’s a stretch but if you leave the trans connector disconnected and read the data live on that sensor does it read the same value?

Trick is to find out what the ohm resistance is for a good sensor then fool the ecm by placing a resistor or a potentiometer on those pins of the trans connector. Verify live data again for acceptable readings. That will verify the harness and ecm/tcm is functioning properly pointing the issue to within the transmission.
 
Do the ohms resistance test on that transmission temperature sensor.
Requires warming the sensor and reading the ohms scale as its heating.
Candy or meat thermometer and a pan of water on the burner with the sensor in the water is the test means.
 
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