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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.
 
I got the resistance vs temp chart today and tested the old parts. The manifold tested to specs, the continuity of the two pins tested good, and after plugging the harness into the manifold there was no significant difference. 4.9 K as apposed as 4.7 k. I'll try to get into the back of the trans and test the new parts I installed.
 
I am trying to locate a detailed wiring schematic of the transmission temperature circuit. Does anyone know of a web site to download one or does someone have one they can post? I’ve been looking for manufacture shop manuals but they are pricy.
 
Searching online for the GM service manual would be the way to go, but you should also be able to stop by a local GM dealer at the parts counter and ask for it. most of the time they keep a library where you can scan off copies of what you need or they can print them for you. Service department might frown but the parts guys don't care LOL
 
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