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 run time is greater than 5 seconds. |
| • | 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 8 km/h (5 mph) or greater 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 calibrated 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.
-
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.
-
This step determines if the TCM or the TFT sensor is causing a steady, unchanging TFT reading.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||
2 | Did you perform the Transmission Fluid Checking Procedure? | -- | Go to Step 3 | Go to Transmission Fluid Check | ||||||
3 |
Important: Before clearing the DTC, use the scan tool in order to record the Failure Records. Using the Clear Info function erases the Failure Records from the TCM.
Did either of the fail conditions occur? | -- | Go to Step 4 | Go to Testing for Intermittent Conditions and Poor Connections | ||||||
4 | Did the scan tool display a condition in which the TFT does not change by greater than the specified value in 1 minute and 20 seconds since startup? | 2°C (4°F) | Go to Step 6 | Go to Step 5 | ||||||
Refer to Automatic Transmission Inline 20-Way Connector End View . Does the TFT change by greater than the specified value? | 20°C (36°F) | Go to Step 7 | Go to Step 8 | |||||||
Did the scan tool display a condition in which the TFT does not change by greater than the specified value in 1 minute and 20 seconds since startup? | 2°C (4°F) | Go to Step 11 | Go to Step 10 | |||||||
7 |
Refer to Circuit Testing and Wiring Repairs . Did you find and correct a condition? | -- | Go to Step 12 | Go to Step 11 | ||||||
8 |
Refer to Circuit Testing and Wiring Repairs . Did you find a condition? | -- | Go to Step 9 | Go to Step 10 | ||||||
9 | Replace the automatic transmission wiring harness. Refer to Wiring Harness Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- | ||||||
10 | Replace the TFT sensor. The TFT sensor is part of the TFP manual valve position switch. Refer to Transmission Fluid Pressure Manual Valve Position Switch Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- | ||||||
11 | Replace the TCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 12 | -- | ||||||
12 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 13 | Go to Step 2 | ||||||
13 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK |
