P0713
DTC P0713
Circuit Description
The automatic transmission fluid temperature (TFT) sensor is a negative coefficient thermistor whose resistance value changes based on temperature. The transmission control module (TCM) provides a 5-volt reference to the sensor. A low fluid temperature or open circuit result in high signal voltage. The TFT operating range is -40 to +150°C (-40 to +302°F).
If the TCM detects a continuous open or a short to voltage on the TFT sensor circuit, then DTC P0713 sets. DTC P0713 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage
Conditions for Running the DTC
^ No AT ISS DTCs P0716 or P0717.
^ No OSS DTCs P0722 or P0723.
^ The engine run time is greater than 5 seconds.
^ LD8: The transmission output shaft speed is 200 RPM or greater for 200 seconds cumulatively.
^ L37: The transmission output shaft speed is 239 RPM or greater for 200 seconds cumulatively.
^ The TCC slip speed is 120 RPM or greater for 200 seconds cumulatively.
Conditions for Setting the DTC
The TCM detects a reading of less than -40°C (-40°F) for 80 seconds.
Action Taken When the DTC Sets
^ The TCM does not request the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL).
^ The TCM freezes transmission adaptive functions.
^ The TCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air temperature and engine run time.
^ 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 P0713 in TCM history.
Conditions for Clearing the DTC
^ The TCM clears the DIC message when the condition no longer exists.
^ A scan tool can clear the DIC/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.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
5. This step tests the TFT sensor signal circuit for being shorted to another circuit within the transmission. If the TFT sensor signal circuit shorts to another circuit, which is carrying voltage greater than five volts, the TFT sensor would become open.
6. This step tests the TFT sensor signal circuit for being shorted to voltage, which would be the cause for the open in the TFT sensor.
