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Makes 🢒 Cadillac 🢒 2005 🢒 DeVille 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T80-E 🢒 DTC P0711

Object Number: 1492403 Size: SF
Master Electrical Component List
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice
Control Module References

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 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 +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 P0116, P0117 or P0118.
    • No VSS DTCs P0502 or P0503.
    • No AT ISS DTCs P0716 or P0717.
    • The engine run time is greater than 5 seconds.
    • The transmission fluid temperature is -38 to +143°C (-36 to +289°F).

Conditions for Setting the DTC

One of the following conditions occurs:

Condition 1

    • DTC P0711 has not passed this ignition cycle.
    • The engine coolant temperature is 70°C (158°F) or greater and has changed by at least 50°C (90°F) since startup.
    • The transmission fluid temperature at startup is -38 to +21°C (-36 to +70°F).
    • The vehicle speed is 8 km/h (5 mph) or greater for 15 minutes cumulatively.
    • The TCC slip is 120 RPM or greater for 15 minutes cumulatively.
    • The transmission fluid temperature has not changed by greater than 2°C (4°F) since startup for 1 minute and 40 seconds.

Condition 2

    • DTC P0711 has not passed this ignition cycle.
    • The engine coolant temperature is 70°C (158°F) or greater and has changed by at least 50°C (90°F) since startup.
    • The transmission fluid temperature at startup is 129-143°C (264-289°F).
    • The vehicle speed is 8 km/h (5 mph) or greater for 15 minutes cumulatively.
    • The TCC slip is 120 RPM or greater for 15 minutes cumulatively.
    • The transmission fluid temperature has not changed by greater than 2°C (4°F) since startup for 1 minute and 40 seconds.

Condition 3

The transmission fluid temperature has changed by 20°C (36°F) or greater 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 transmission adaptive functions.
    • The PCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air temperature and engine run time.
    • 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.

  1. 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.

    2.

  2. This step determines if the PCM or the TFT, sensor is causing a steady, unchanging TFT, reading.

DTC P0711

Step

Action

Values

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Did you perform the Transmission Fluid Checking Procedure?

--

Go to Step 3

Go to Transmission Fluid Check

3
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.

    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 PCM.

  3. Record the DTC Failure Records.
  4. Clear the DTC.
  5. Select Trans. Fluid Temp. on the scan tool.
  6. Drive the vehicle and observe the scan tool for either of the following fail conditions:
    7. • The TFT does not change greater than 2°C (4°F) in 1 minute and 40 seconds since startup.
    • The TFT changes by 20°C (36°F) or greater in 0.200 second, 14 times within 7 seconds, unrealistic change.

Did either fail condition occur?

--

Go to Step 4

Go to Intermittent Conditions in Engine Controls

4

Did the scan tool display a condition in which the Trans. Fluid Temp. does not change by greater than the specified value in 1 minute and 40 seconds since startup?

2°C (4°F)

Go to Step 6

Go to Step 5

5
  1. Turn OFF the ignition.
  2. Disconnect the AT inline 20-way connector. Additional DTCs may set.
  3. Install the J 44152 Jumper Harness (20 pins) on the engine side of the AT inline 20-way connector.
  4. Using the J 35616 GM Terminal Test Kit, connect a test light between terminals L and M of the J 44152 .

    5. Refer to Automatic Transmission Inline 20-Way Connector End View .

  5. Turn ON the ignition, with the engine OFF.
  6. While observing the scan tool display, move or wiggle the engine wiring harness from the PCM to the AT inline 20-way connector.

Does the Trans. Fluid Temp. change by greater than the specified value?

20°C (36°F)

Go to Step 7

Go to Step 8

6
  1. Turn OFF the ignition.
  2. Disconnect the AT inline 20-way connector.
  3. Turn ON the ignition, with the engine OFF.

Did the scan tool display a condition in which the Trans. Fluid Temp. does not change by greater than the specified value in 1 minute and 40 seconds since startup?

2°C (4°F)

Go to Step 11

Go to Step 10

7
  1. Test the signal circuit of the TFT sensor for an intermittent open or short condition between the PCM connector C3 and the AT inline 20-way connector.
  2. Test the low reference circuit of the TFT sensor for an intermittent open or short condition between the PCM connector C3 and the AT inline 20-way connector.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct a condition?

--

Go to Step 12

Go to Step 11

8
  1. Test the signal circuit of the TFT sensor for an intermittent open or short condition between the AT inline 20-way connector and the TFT sensor.
  2. Test the low reference circuit of the TFT sensor for an intermittent open or short condition between the AT inline 20-way connector and the TFT sensor.

Refer to Circuit Testing in Wiring Systems.

Did you find a condition?

--

Go to Step 9

Go to Step 10

9

Important: The automatic transmission wiring harness consists of 2 separate harnesses, the Automatic Transmission Wiring Harness Assembly and the Automatic Transmission Wiring Extension Harness Assembly. In order to avoid the unnecessary replacement of parts, only replace the Automatic Transmission Wiring Harness Assembly.

Replace the automatic transmission wiring harness.

Refer to Input Speed Sensor and Wiring Harness Removal in the 4T80-E section of the Transmission Unit Repair Manual.

Did you complete the replacement?

--

Go to Step 12

--

10

Replace the TFT sensor.

Refer to Control Valve Upper Body Disassemble in the 4T80-E section of the Transmission Unit Repair Manual.

Did you complete the replacement?

--

Go to Step 12

--

11

Replace the PCM.

Refer to Control Module References in Computer/Integrating Systems.

Did you complete the replacement?

--

Go to Step 12

--

12

Perform the following procedure in order to verify the repair:

  1. Select DTC.
  2. Select Clear Info.
  3. Drive the vehicle and ensure the following conditions are met:
    4. • The TFT is -38 to +143°C (-36 to +289°F).
    • The TFT changes by greater than 2°C (4°F) since startup.
    • The TFT does not change by 20°C (36°F) or greater within 200 milliseconds.
  4. Select Specific DTC.
  5. Enter DTC P0711.

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?

--

Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information

System OK