P0711

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, the sensor resistance decreases. This diagnostic monitors the TFT circuit. The circuit may be functional, but not in the normal operating range. This diagnostic indicates stuck, erratic, intermittent, or skewed values, indicating poor system performance. The TFT range is -40 to +151°C (-40 to +305°F).
When the PCM detects an intermittent voltage or no voltage change in the TFT sensor circuit, then DTC P0711 sets. DTC P0711 is a type D DTC.

Conditions for Running the DTC
^ No VSS DTCs P0502 or P0503.
^ No A/T ISS DTCs P0716 or P0717.
^ The transmission fluid temperature at start-up is -40 to 21°C (-40 to 70°F).
^ The system voltage is 8-18 volts.
^ The engine run time is greater than 5 minutes.
^ The vehicle speed is greater than 8 km/h (5 mph) for 6 minutes and 49 seconds cumulatively.
^ The Torque Converter Clutch (TCC) slip is greater than 300 RPM for 6 minutes and 49 seconds cumulatively.
^ The engine coolant temperature is greater than 70°C (158°F).
^ The engine coolant temperature has changed by more than 50°C (90°F) since start-up.

Conditions for Setting the DTC
One of the following conditions occurs:
^ The change in transmission fluid temperature is less than 1.5°C (2°F) since start-up for 20 seconds.
^ The change in transmission fluid temperature is greater than 20°C (36°F) within 200 milliseconds; 14 times within 7 seconds.

Action Taken When the DTC Sets
^ The PCM does not illuminate the malfunction indicator lamp (MIL).
^ The PCM freezes shift adapts from being updated.
^ The PCM calculates a default transmission fluid temperature based on engine coolant temperature, manifold air temperature, and engine run time.
^ The PCM stores DTC P0711 in PCM history.

Conditions for Clearing the DTC
^ A scan tool clears the DTC from PCM history.
^ The PCM clears the DTC from PCM history if the vehicle completes 40 consecutive 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 ignition switch is OFF long enough in order to power down the PCM.

Diagnostic Aids
^ Inspect the wiring at the PCM, the transmission 20-way connector and the TFP manual valve position switch 6-way connector for the following conditions:
- A backed out terminal.
- A damaged terminal.
- Reduced terminal tension.
- A chafed wire.
- A broken wire inside the insulation.
- Moisture intrusion.
- Corrosion.
^ Test the TFT sensor at various temperature levels to evaluate the possibility of a skewed (mis-scaled) sensor.
^ When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change.
^ Inspect the transmission 20-way connector for transmission fluid.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
5. This step tests for an intermittent short or open condition in the engine wiring harness. The test light is used as a resistor in the circuit.
6. This step determines if the PCM or the TFT sensor is causing a steady, unchanging TFT reading.