VT25-E Automatic Transmission

VT25-E AUTOMATIC TRANSMISSION

DTC P0711





Circuit Description with VT25-E Automatic Transmission
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, skewed, or inaccurate values, indicating poor system performance. The TFT range is -40 to +151°C (-40 to +305°F).
If the TCM detects no voltage changes or rapid voltage changes 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
^ For condition 1 and 2 below, no ECT DTC P1792.
^ For condition 1 below, no OSS DTCs P0722, or P0723.
^ For condition 1 below, no ISS DTCs P0716, or P0717.
^ For condition 1 and 2 below, P0711 has not passed in the current ignition cycle.
^ The engine speed is greater than 500 RPM for 5 seconds.

Conditions for Setting the DTC
One of the following conditions occurs:

Condition 1
^ The transmission fluid temperature at start-up is -40 to -20°C (-40 to -4°F).
^ The engine coolant temperature is 0°C (32°F) or greater and has changed more than 20°C (36°F).
^ The transmission fluid temperature has not changed by more than 2°C (4°F) since start-up for 180 seconds.

Condition 2
^ The transmission fluid temperature at start-up is -20°C and 140°C (-4°F and 284°F).
^ The engine coolant temperature is 70°C (158°F) or greater and has changed more than 50°C (90°F).
^ The transmission fluid temperature has not changed by more than 2°C (4°F) since start-up for 180 seconds.
^ The transmission output shaft speed is 400 RPM or greater for 5 minutes.
^ The TCC slip speed is 120 RPM or greater for 3 minutes.

Condition 3
The transmission fluid temperature has changed by 15°C (27°F) or greater 10 times within 2 seconds.

Action Taken When the DTC Sets
^ The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL).
^ The TCM will request the ECM to illuminate the service vehicle soon (SVS) lamp.
^ The TCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air temperature and engine run time.
^ The TCM freezes garage shift transmission adaptive functions.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
^ The TCM stores DTC P0711 in TCM history.

Conditions for Clearing the SVS Lamp/DTC
^ The TCM clears the SVS lamp request when the condition no longer exists.
^ A scan tool can clear the SVS lamp/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the fault no longer exists and the DTC passes.

Diagnostic Aids
^ Inspect the connectors at the TCM, the transmission, and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections.
^ Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents.








Test Description
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 TCM or the TFT, sensor is causing a steady, unchanging TFT, reading.