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 808 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 D DTC.
CONDITION 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 volts or more) for 7 minutes.
ACTION TAKEN WHEN THE DTC SETS
^ The PCM uses a default transmission fluid temperature of 95°C (203°F) for transmission operation.
^ The PCM does not illuminate the Malfunction Indicator Lamp (MIL).
CONDITIONS FOR CLEARING THE DTC
^ 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.