P0713

Circuit Description with 4T80-E Automatic Transaxle

Schematic:

The automatic Transmission Fluid Temperature (TFT) sensor is a negative coefficient thermistor whose resistance value changes based on temperature. The PCM provides a 5 volt reference to the sensor. A low fluid temperature or open circuits result in high signal voltage. The TFT operating range is -40 to +151°C (-40 to +305°F).

If the PCM 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.

CONDITIONS FOR RUNNING THE DTC
^ No VSS DTCs P502 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 output shaft speed is greater than 738 RPM for 5 minutes cumulatively.
^ The TCC slip speed is greater than 49 RPM for 6 minutes and 40 seconds cumulatively.

CONDITIONS FOR SETTING THE DTC
The PCM detects a reading of -40°C (-40°F) or less for 6 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 the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
^ The PCM stores DTC P0713 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 DESCRIPTION

Steps 1 - 8:

Steps 9 - 11:

The numbers below refer to the step numbers on the diagnostic table.
3. This step tests the wiring from the AT inline 20-way connector to the PCM for an open or short to voltage.
4. This step verifies the signal circuit from the PCM to the AT inline 20-way connector.