DTC P0711: Transaxle Fluid Temperature Sensor Circuit Fault (Stuck): Description
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.
DTC will set if vehicle speed is 37 MPH or more for more than 7 minutes and TFT sensor signal remains at 68°F (20°C) or less, or voltage remains at 3.6 volts or more and DTC P0710 is not set.