I was wondering since it's in fluid coupling mode in 2nd. So there's some large power losses/heat generation due to churning and pressure while in that gear. I probably need to figure out how to log that...
From here (
http://www.europeantransmissions.com.../6hp_trans.pdf) it appears there's two temp sensors: Trans Fluid Temp (TFT) and Substrate Temp Sensor (basically the temp of the TCM itself). There appears to be multiple changes to shift strategies and protection based on these two sensors.