Turbine Shaft Speed (TSS) Sensor
WARNING: This page is about a different car, the 2010 Mercury Milan and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
This Turbine Shaft Speed (TSS) sensor is a Hall-effect pickup that sends a signal to the PCM that indicates transaxle turbine shaft input speed. The TSS sensor provides converter turbine speed information for TCC strategy. Also used in determining static LPC pressure settings.