The engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor and transaxle fluid temperature (TFT) sensor are thermistors that vary resistance according to changes in engine coolant, air induction and transaxle fluid temperature. The powertrain control module (PCM) supplies a 5-volt reference through a pull-up resistor to each sensor, which are connected to ground. When each sensor is cold it has high resistance, high signal voltage at PCM. As the sensor temperature increases, its resistance decreases, lower signal voltage at PCM. The PCM uses the signal voltage to determine engine coolant, air induction and transaxle fluid temperature. DTC P0710 sets when the transaxle fluid temperature is below a calibrated temperature, above a calibrated voltage, based on the ECT and IAT temperatures. This DTC compares the temperatures of the ECT, IAT and TFT for rationality.

DTC P0710 will set if TFT sensor temperature is below a calibrated temperature, above a calibrated voltage, based on ECT and IAT sensor temperatures when:

DTC P0710 diagnostic runs continuously once the above conditions have been met.

DTC P0710 is a type A DTC.

DTC P0710 indicates a skewed ECT, IAT or TFT sensor or increased sensor circuit resistance.

Check for skewed high ECT temperature, skewed high IAT temperature or skewed low TFT temperature by comparing each value to each other after vehicle has been turned Off for over a 6 hour period. Each sensor temperature should be within 2°C of each other.

For this DTC to set, the TFT temperature must be less than (ECT + IAT)/2-40 in °C. This must exist along with the other DTC parameters.