P0711

Diagnostic Chart:

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 151°C (-40 to 304°F).

When the PCM detects a TFT signal voltage input of less than 0.200 volts at a temperature of 151°C (304°F), then DTC P0711 sets DTC P0711 is a type B DTC.

Conditions for Setting the DTC

No Vehicle Speed Sensor (VSS) DTCs P0502 or P0503.

^ No System Voltage Malfunction DTC P0560.

^ 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 the ignition cycle.

^ The TCC slip speed is 120 RPM or more for 7 minutes, cumulative the 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 P0112, P0113, P1111, or P1112 is set. then the default Automatic Transmission Fluid Temperature (TFT) is 0°C (32°F).

^ If the engine run time is less than 3 minutes and no IAT DTC is set, then the default TFT sets to the IAT saved at start up.

^ If the engine run time is greater than 3 minutes and the Engine Coolant Temperature (ECT) DTC P0117, P0118, P1114, or P1115 is set, then the default TFT is 131°C (268°F).

^ If the engine run time is greater than 3 minutes, no ECT DTC is set, and the ECT is less than 45°C (113°F), then the default TFT is 12°C (54°F).

^ If the engine run time is greater than 3 minutes, no ECT DTC is set, and the ECT is greater than 115°C (239°F), then the default TFT is 131°C (268°F).

^ If the engine run time is greater than 3 minutes, the ECT is 45-115°C (113-239°F), and the IAT DTC P0112, P0113, Pull, or P1112 is set, then the default TFT sets to equal the ECT.

^ If the engine run time is greater than 3 minutes, the ECT is 45-115°C (113-239°F), and the IAT start up is less than 0°C (32°F), then the default TFT sets to the ECT minus 10°C (18°F).

^ If the engine run time is greater than 3 minutes, the ECT is 45-115°C (113-239°F), and the IAT start up is greater than 28°C (82°F), then the default TFT sets to the ECT plus 10°C (18°F).

^ If the engine run time is greater than 3 minutes, the ECT is 45-115°C (113-239°F), and the IAT at start up is 0-28°C (32-82°F), then the default TFT sets to equal the ECT.

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

Conditions for Clearing the MIL/DTC

^ 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.

^ The PCM will turn OFF the MIL after three consecutive ignition cycles without a failure reported.

Diagnostic Aids

^ Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring at the TCC brake switch. 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.

^ 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.

3. This step tests for an open circuit.

5. This step tests for a short to ground.

7. This step compares the TFT to the TFT sensor resistance in order to determine faulty sensor or PCM exists.