Turbine Shaft Speed (TSS) Sensor
WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
The turbine shaft speed (TSS) sensor is a magnetic pickup that sends the PCM the torque converter turbine speed information.
The TSS sensor is mounted externally on the case.
The PCM uses TSS information to help determine appropriate operating pressures and TCC operation.