P0711
Circuit Description with 4T80-E Automatic TransaxleTransmission Fluid Temperature (TFT) Sensor Circuit Schematic:
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 +305°F).
If the 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.
CONDITIONS FOR RUNNING THE DTC
^ NoECTDTCsPO116,P0117,P0118,P1114 or P1115.
^ No VSS DTCs P0502 or P0503.
^ No AT ISS DTCs P0716 or P0717.
^ The system voltage is 8-18 volts.
^ The engine run time is greater than 5 seconds.
^ The engine is not in fuel cut off.
^ 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 greater than 70°C (158°F) and has changed by greater than 50°C (90°F) since start-up.
^ The transmission fluid temperature at start-up is -38 to 21°C (-36 to 70°F).
^ The vehicle speed is greater than 8 km/h (5 mph) for 15 minutes cumulatively.
^ The TCC slip is greater than 120 RPM for 15 minutes cumulatively.
^ The change in transmission fluid temperature is less than 2°C (4°F) for 1 minute and 40 seconds.
Condition 2
^ DTC P0711 has not passed this ignition cycle.
^ The engine coolant temperature is greater than 70°C (158°F) and has changed by greater than 50°C (90°F) since start-up.
^ The transmission fluid temperature at start-up is 129 to 143°C (264 to 289°F).
^ The vehicle speed is greater than 8 km/h (5 mph) for 15 minutes cumulatively.
^ The TCC slip is greater than 120 RPM for 15 minutes cumulatively.
^ The change in transmission fluid temperature is less than 2°C (4°F) for 50 seconds.
Condition 3
The change in transmission fluid temperature is greater than 20°C (36°F) 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 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/or the ignition switch is OFF long enough in order to power down the PCM.
DIAGNOSTIC AIDS
^ Inspect the connectors at the PCM, the TFT sensor, and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent and Poor Connections in Diagrams.
^ Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents in Diagrams.
^ Test the TFT sensor at various temperature levels to evaluate the possibility of a skewed (mis-scaled) sensor.
Refer to the TFT Sensor Specifications Table.
TEST DESCRIPTION
Steps 1 - 7:
Steps 8 - 12:
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 PCM or the TFT, sensor is causing a steady, unchanging TFT, reading.