P0713

Circuit Description

The Automatic Transmission Fluid Temperature (TFT) sensor is a negative coefficient thermistor. The sensor resistance changes with temperature. The Powertrain Control Module (PCM) provides a 5-volt reference to the sensor on circuit 1227. An open in circuit 1227 or circuit 452 results in high signal voltage. The TFT operating range is from -40 to +140°C (-40 to +284°F).

When the PCM detects a voltage input greater than 4.92 volts in the TFT Sensor circuit, then DTC P0713 sets. DTC P0713 is a type A DTC.


Conditions for Setting the DTC

^ No System Voltage Malfunction DTC P0560

^ The ignition is ON.

^ The PCM detects a transmission fluid temperature of -35°C (-31°F) or less (4.92 volt or more) for 7 minutes.


Action Taken When the DTC Sets

^ The PCM uses a default transmission fluid temperature of 131°C (268°F) for transmission operation.

^ The PCM illuminates the Malfunction Indicator Lamp (MIL).

Conditions for Clearing the MIL/DTC

^ The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.

^ A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.

^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.


Diagnostic Aids

^ Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring at the transmission 7-way connector. Look for the following conditions:

- A bent terminal

- A backed out terminal

- A damaged terminal

- Poor terminal tension

- A chafed wire

- A broken wire inside the insulation

^ When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change.


Test Description

The numbers below refer to the step numbers on the diagnostic chart.

3. A scan tool Trans. Fluid Temp. of -36°C (-33°F) or less indicates that this DTC is current.

4. This Step isolates the fault between the transmission harness or the engine harness.