P0711
Schematic:
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 PCM supplies a five 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 sensor temperature increases, its resistance decreases (low signal voltage at PCM). The PCM uses the signal voltage to determine engine coolant, air induction and transaxle fluid temperature. DTC P0711 sets when the transaxle fluid temperature is above a calibrated temperature (below a calibrated voltage) based on IAT temperature when vehicle has been started cold. A cold start is determined when ECT and IAT readings are within a certain temperature of each other. This DTC is a rational check of the TFT sensor.
DTC PARAMETERS
DTC P0711 will set if TFT sensor temperature is greater than 9°C plus IAT sensor temperature when:
- Vehicle is in a cold soak (ECT and IAT temperature are within ±6°C [11°F] of each other)
- Condition exists for longer than 2 seconds
- IAT is less than 40°C (104°F)
- No ECT, IAT, P0710, P0712, P0713, P0714 DTCs have been set
DTC P0711 diagnostic runs once per ignition cycle once the above conditions have been met.
DTC P0711 is a type A DTC.
DIAGNOSTIC AIDS
IMPORTANT: If DTC P1635 is also set, diagnose that DTC first. A short to ground/short to voltage on the 5 volt reference circuit may set this DTC.
DTC P0711 indicates a skewed TFT sensor or decreased sensor circuit resistance.
Transaxle fluid leaking from the sensor into the sensor connector will cause a shorted condition across the sensor terminals resulting in an elevated temperature.