P0711

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
The Automatic Transmission Fluid Temperature (TFT) Sensor is a thermistor (temperature sensitive resistor). The TFT Sensor is part of the 4L80-E Automatic Transmission Wiring Harness Assembly (Air Wiring Harness Assy). The TFT Sensor receives a 5 volt reference signal from the Powertrain Control Module (PCM) on circuit 1227. When the fluid temperature is low, the TFT Sensor has a high resistance and the PCM detects a high voltage on circuit 1227. As fluid temperature rises, the TFT Sensor resistance gradually decreases and the PCM senses a lower voltage on circuit 1227.
If the PCM detects no change in the TFT sensor resistance or unrealistic changes in a short amount of time in the TFT sensor resistance (multiple changes within seconds), then DTC P0711 sets. DTC P0711 is a type D DTC. For California emissions vehicles, DTC P0711 is a type B DTC.

CONDITIONS FOR SETTING THE DTC
^ No ECT DTCs P1117 or P1118.
^ No Output Speed Shaft (OSS) sensor DTC P0502.
^ No Automatic Transmission Input Speed Shaft (A/T ISS) sensor DTC P0716 or P0717.
^ No A/T Component Slipping DTC P1870.
^ The system voltage is 10.0- 16.0 volts.
^ The engine is running greater than 475 RPM for at least 30 seconds.
^ The engine coolant temperature (ECT) is greater than 80°C (176°F).
^ The TFT is -40 to +21°C (-40 to +70°F) at start up.
^ The ECT has changed at least 50°C (122°F) since start up.
^ The vehicle speed is greater than 3 mph for at least 900 seconds (15 minutes).
^ The TCC slip speed is greater than 60 RPM for at least 850 seconds (14 minutes).
^ DTC P0711 sets if all of the above conditions have been met and one of the following conditions exist:
- No TFT change: The TFT has not changed more than 2.25°C (4°F), in more than 80 seconds.
- An unrealistic temperature change: The TFT has changed more than 20°C (68°F) 14 times in 7 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM uses a TFT default value of 140°C (280°F).
^ The PCM freezes shift adapts.
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) on California emissions vehicles.

CONDITIONS FOR CLEARING THE MIL/DTC
^ For California Emissions only, the PCM turns off the MIL after three consecutive ignition cycles without a failure reported.
^ A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.
^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough to power down the PCM.

DIAGNOSTIC AIDS
^ When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
^ First diagnose and clear any engine DTCs that are present. Then inspect for any transmission DTCs that may have reset.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests for proper A/T fluid level and condition.
3. This step verifies that the vehicle sets DTC P0711.
5. The 12-volt test lamp is used as a fixed resistance.
6. Perform this step in order to ensure that the PCM monitors circuit 1227.
8. The TFT Sensor is part of the A/T Wiring Harness Assembly.