P0713

DTC P0713 (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 sensor is a resistor, or thermistor, which changes 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 operating temperature, 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 a continuous open or short to power in the TFT signal circuit or the TFT sensor, then DTC P0713 sets. DTC P0713 is a type C DTC.

Conditions for Running the DTC
^ The system voltage is 8 - 18 volts.
^ The ignition is ON.

Conditions for Setting the DTC
The TFT sensor indicates a signal voltage greater than 4.92 volts for 409 seconds (6.8 minutes).

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 to a normal operating temperature, then stabilize when 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
The scan tool also displays the transmission fluid temperature in degrees. After the transmission is operating, the fluid temperature should rise steadily to a normal operating temperature, then stabilize.

Test Description
The numbers below refer to the step numbers in the diagnostic table.
3. This step verifies a condition in the TFT sensor circuit.
4. This step stimulates a TFT sensor DTC P0712. If the PCM recognizes low signal voltage (high temperature), the PCM and wiring are functionally normally.
5. This step tests the TFT sensor and Automatic Transmission (AT) wiring harness assembly.