DTC P0710: Transaxle Fluid Temperature Sensor Circuit Shorted To Ground Or Open: 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 TFT sensor voltage is .1 volt or less and vehicle speed is 12 MPH or more, or TFT sensor voltage is 4.9 volts or more and vehicle speed is 12 MPH or more.