P0711
DTC P0711 (3.8L)
Circuit Description
The automatic transmission fluid temperature (TFT) sensor is a negative coefficient thermistor. When the transmission fluid is cold, the sensor resistance is high. As the transmission fluid warms up, the sensor resistance decreases. This diagnostic monitors the TFT sensor circuit. The circuit may be functional but not in the normal operating range. This diagnostic indicates stuck, erratic, intermittent, or skewed values, resulting in reduced system performance. The TFT sensor range is -40 to +151°C (-40 to +304°F).
If the powertrain control module (PCM) detects an intermittent voltage or no voltage change in the TFT sensor circuit, then DTC P0711 sets. DTC P0711 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0711 Transmission Fluid Temperature (TFT) Sensor Performance
Conditions for Running the DTC
* No ECT DTCs P0117 or P0118.
* No VSS DTCs P0502 or P0503.
* No ISS DTCs P0716 or P0717.
* The engine run time is 5 minutes or greater.
* The engine coolant temperature is at least 84°C (183°F) and has changed 55°C (99°F) since start up.
* The TFT sensor voltage is 0.2-4.92 volts.
* The transmission fluid temperature at start-up is -40 to +21°C (-40 to +69°F).
* The vehicle speed is 8 km/h (5 mph) or greater for at least 6 minutes and 49 seconds cumulative.
* The TCC slip is 80 RPM or greater for at least 6 minutes and 49 seconds cumulative.
Conditions for Setting the DTC
DTC P0711 sets when 1 of the following conditions occurs:
Condition 1
The change in transmission fluid temperature is 1.5°C (2°F) or less since start-up for at least 6 minutes and 49 seconds continuous.
Condition 2
The change in transmission fluid temperature is 20°C (36°F) or greater 14 times within 7 seconds.
Action Taken When the DTC Sets
* The PCM does not illuminate the malfunction indicator lamp (MIL).
* The PCM freezes transmission adaptive functions.
* The PCM calculates a default TFT from the ECT sensor and the IAT sensor.
* The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
* The PCM stores DTC P0711 in PCM history.
Conditions for Clearing the DTC
* A scan tool can clear the DTC.
* The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
* The PCM cancels the DTC default actions when the fault no longer exists and the DTC passes.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This step attempts to repeat the condition that set the DTC.
5. This step attempts to repeat the condition in the engine wiring harness.
6. This step determines if a condition exists with the PCM or TFT sensor.
