Input/Turbine Speed Sensor
WARNING: This page is about a different car, the 2002 Mazda Millenia and 2001 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
Input/turbine speed sensor is a magnetic pick-up that monitors reverse and forward drum speed (torque converter output speed). An A/C waveform is input to PCM by input/turbine speed sensor. Sensor is located on top end of transaxle. See Figure.