P0711

DTC 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 transmission control module (TCM) 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 ISS DTCs P0716 or P0717.
^ No OSS DTCs P0722 or P0723.
^ DTC P0711 has not passed this key cycle.
^ The engine coolant temperature (ECT) is 70°C (158°F) or more for Condition 1 and Condition 2.
^ The ECT has changed by 55°C (99°F) or more since start-up for Condition 1 and Condition 2.
^ The TFT is -39°C to 149°C (-38°F to 300°F).
^ The vehicle speed is 8 km/h (5 mph) or more for 5 minutes cumulatively for Condition 1 and Condition 2.
^ The torque converter clutch (TCC) slip is 120 RPM or more for 5 minutes cumulatively for Condition 1.
^ The Calc. Throttle Position is between 8 and 90 percent for Condition 3.
^ The engine torque is greater than 50 N.m (37 lb ft) for Condition 3.
^ The vehicle speed is greater than 8 km/h (5 mph) for Condition 3.

Conditions for Setting the DTC

One of the following conditions occurs:

Condition 1

The change in TFT is less than 2°C (4°F) when the TFT is -39°C to 20°C (-38°F to 68°F) at start-up for 1 minute and 20 seconds.

Condition 2

The change in TFT is less than 2°C (4°F) when the TFT is 129°C to 149°C (264°F to 300°F) at start-up for 1 minute and 20 seconds.

Condition 3

The TFT is 20°C (68°F) or less after a predetermined amount of time.

Action Taken When the DTC Sets

^ The TCM does not illuminate the malfunction indicator lamp (MIL).
^ The TCM freezes transmission adaptive functions.
^ The TCM calculates a default transmission fluid temperature based on engine coolant temperature, manifold air temperature, and engine run time.
^ The TCM records the operating conditions when the Conditions for setting the DTC are met. The TCM stores this information as Failure Records.
^ The TCM stores DTC P0711 in TCM history.

Conditions for Clearing the DTC

^ A scan tool can clear the DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
^ The TCM 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.
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 TCM or the TFT sensor is causing a steady, unchanging TFT reading.

Step 1 - Step 5:

Step 6 - Step 11: