For 1990-2009 cars

### Circuit Description

The Automatic Transmission Fluid Temperature (TFT) sensor is a negative coefficient thermistor. The TFT sensor resistance changes with temperature. The Powertrain Control Module (PCM) provides a 5-volt reference to the sensor on circuit 1227. A short to ground on circuit 1227 causes low signal voltage. The TFT signal operating range is -40 to 150°C (-40 to 302°F).

When the PCM detects a TFT signal voltage input of less than 0.200 volts at a temperature of 150°C (302°F), then DTC P0711 sets. DTC P0711 is a type B DTC.

### Conditions for Setting the DTC

• | No VSS DTCs P0502 or P0503.

• | System voltage is 10-16 volts.

• | No Transmission Component Slipping DTC P1870.

• | The TFT at start up is -40 to 21° (-40 to 69°F)

• | The engine run time is 5 minutes or more.

• | The vehicle speed is 8 km/h (5 mph) or more for 7 minutes or more, cumulative this ignition cycle.

• | The TCC slip speed is 120 RPM or more for 7 minutes, cumulative this ignition cycle.

• | The ECT is 70°C (158°F) or more.

• | The ECT has changed 50°C (90°F) or more since start up.

• | The TFT voltage is 0.20-4.92 volts.

All of the above must be true and one of the following fail cases must be true:

• | Fail Case 1

| The change in TFT is 1.5°C (2.7°F) or less since start up for 7 minutes or more.

• | Fail Case 2

| The change in TFT is 20°C (36°F) or more within 0.2 seconds for 14 times or more within 7 seconds.

### Action Taken When the DTC Sets

• | If the Engine Run Time is less than 3 minutes and:

- | The Intake Air Temperature (IAT) DTC(s) P0112, P0113, P1111 or P1112 is set, then the default Automatic Transmission Fluid Temperature (TFT) is set to 0°C (32°F).

- | No IAT DTC is set, then the default TFT is set to the IAT value which was saved at start up.

• | If the engine run time is greater than 3 minutes and:

- | The Engine Coolant Temperature (ECT) DTC(s) P0117, P0118, P1114 or P1115 is set, then the default TFT is set to 131°C (268°F).

- | No ECT DTC is set, and:

• | The ECT is less than 45°C (113°F), then the default TFT is 12°C (54°F).

• | The ECT is greater than 115°C (239°F), then the default TFT is 131°C (268°F).

- | No ECT DTC is set, the ECT is 45-115°C (113-239°F) and:

• | The IAT DTC(s) P0112, P0113, P1111 or P1112 is set, then the default TFT is set to equal the ECT.

• | The IAT at start up is less than 0°C (32°F), then the default TFT is set to the ECT value minus 10°C (18°F).

• | The IAT at start up is greater than 28°C (82°F), then the default TFT is set to the ECT value plus 10°C (18°F).

• | The IAT at start up is 0-28°C (32-82°F), then the default TFT is set to equal the ECT value.

• | The PCM illuminates the Malfunction Indicator Lamp (MIL) after two consecutive trips with a failure reported.

### Conditions for Clearing the MIL/DTC

• | 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 in order to power down the PCM.

### Diagnostic Aids

• | Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring at the Automatic Transmission 7-way connector. Look for the following conditions:

- | A bent terminal

- | A backed out terminal

- | A damaged terminal

- | Poor terminal tension

- | A chafed wire

- | A broken wire inside the insulation

• | Test the TFT sensor at various temperature levels in order to evaluate the possibility of a skewed (mis-scaled) sensor.

• | Refer to Temperature Versus Resistance .

• | When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change.

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step determines if the condition exists in the wiring or a component.

2. This step determines if the condition exists in the engine harness or the transmission harness.

3. This step determines if a condition exists with the PCM or TFT Sensor.

#### P0711 Transmission Fluid Temperature (TFT) Sensor Circuit -- Range/Performance

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | Go to Powertrain On Board Diagnostic (OBD) System Check
2 | Did you perform the transmission fluid checking procedure? | -- | Go to Step 3 | Go to Transmission Fluid Check
3 |

1. Install the Scan Tool .
2. With the engine OFF, turn the ignition switch to the RUN position.

Important:: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data.

3. Select Trans. Fluid Temp. on the scan tool.
4. Start the engine, observe the scan tool display and record the reading.

Does the Transmission Fluid Temperature fluctuate by more than the specified value?

20° in 0.20 seconds

Go to Step 5

Go to Step 4

4 | Let the vehicle run for at least 7 minutes. Does the TFT rise more than the specified value? | 1.5°C (2.7°F) | Go to Diagnostic Aids | Go to Step 6
5 |

1. With the ignition OFF, disconnect the 7-way connector at the transmission.

Important:: Additional DTCs will set.

2. Install a 12 volt test-light between terminal F and terminal G of the engine harness connector using J 35616-A Connector Test Adapter Kit.
3. Turn the ignition switch to the RUN position and observe TFT on the scan tool.

Does the TFT fluctuate by more than the specified value?

20°C (36°F)

Go to Step 7

Go to Step 8

6 |

1. With the ignition switch OFF, disconnect the Automatic Transmission 7-way connector at the transmission.

Important:: Additional DTCs will set.

2. Turn the ignition switch to the RUN position and observe TFT on the scan tool.

Is the TFT the same as in step 3?

--

Go to Step 7

Go to Step 11

7 | Check circuits 452 and 1227 of the engine harness for an intermittent open. Refer to Electrical Diagnosis, Section 8. Was the condition found and corrected? | -- | Go to Step 12 | Go to Step 9
8 | Check circuits 452 and 1227 of the engine harness for an intermittent short to ground. Refer to Electrical Diagnosis, Section 8. Was the condition found and corrected? | -- | Go to Step 12 | Go to Step 11
9 | Inspect the PCM connector C1 for bent, damaged or backed out connector pins. Was the condition found and corrected? | -- | Go to Step 12 | Go to Step 10
10 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming , Section 6. Is the replacement complete? | -- | Go to Step 12 | --
11 | Replace the TFT Sensor. Refer to Solenoids and Wiring Harness, Section 7. Is the replacement complete? | -- | Go to Step 12 | --
12 | In order to verify your repair, perform the following procedure:

1. Select DTC.
2. Select Clear Info.
3. Start and run the vehicle under the following conditions:

• | TFT Sensor voltage is 0.20-4.92 volts.

• | The TFT rises 3°C (5.4°F) or more since start up.

• | The TFT does not rise more than 20°C (36°F) within 0.2 seconds for more than 7 seconds.

4. Select Specific DTC. Enter DTC P0711.

Has the test run and passed?

--

System OK

Begin the diagnosis again. Go to Step 1