P0711

DTC P0711 (3.8 L)















Circuit Description with 4L30-E Automatic Transmission
The automatic Transmission Fluid Temperature (TFT) sensor is part of the automatic transmission fluid pressure (TFP) manual valve position switch. The TFT PCM uses this information to control shift quality value based on temperature. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases, and as the temperature decreases, the resistance increases. The Powertrain Control Module (PCM) supplies a 5-volt reference signal to the sensor on the TFT sensor signal circuit and measures the voltage drop in the circuit. When the transmission fluid is cold the sensor resistance is high and the PCM detects high signal voltage. As the fluid temperature warms to a normal, the resistance becomes less and the signal voltage decreases. The PCM uses this information to control shift quality and torque converter clutch apply.
When the PCM detects the following unusual conditions, then DTC P0711 sets.
^ An unrealistically large change in transmission temperature.
^ A transmission temperature which remains constant for a period of time in which a measurable amount of change is expected.

DTC P0711 is a type C DTC.

Conditions for Running the DTC
^ No VSS assembly DTCs P0502 or P0503.
^ No transmission component slipping DTC P1870.
^ The system voltage is 8 - 18 volts.
^ The engine is running for 409 seconds.
^ The vehicle speed is greater than 8 km/h (5 mph) 409 seconds cumulative during the current ignition cycle.
^ A scan tool can clear the DTC
^ The TFT at start-up is between -40 and +21°C (-40 and +70°F).
^ The TFT Is between -38 and +151°C (-36 and +304°F).
^ The Engine Coolant Temperature (ECT) is greater than 70°C (153°F) and has changed by 50°C (90°F) since start-up.

Conditions for Setting the DTC
DTC P0711 sets if one of the following conditions occurs:

Condition 1
The TFT does not change more than 1.50°C (2.7°F) for 409 seconds since start-up. test lamp is used as a resistor in the circuit.

Condition 2
The TFT changes more than 20°C (36°F) in 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 shift adapts from being updated.
^ 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 with out 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 to power down the PCM.

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 lamp is used as a resistor in the circuit.
^ This step determines if the PCM or the TFT sensor is causing a steady, unchanging TFT reading.