P0713

DIAGNOSTIC TROUBLE CODE (DTC) P0713 TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR CIRCUIT HIGH INPUT





Circuit Description
The Automatic Transmission Fluid Temperature (TFT) Sensor Assembly is a thermistor and is part of the Transmission Range (TR) Selector Switch. The PCM supplies a 5 volt reference signal to the sensor on circuit 506. When transmission fluid is cold, the sensor resistance is high and the PCM will sense a high signal voltage. As the transmission fluid warms, the sensor resistance lowers and the PCM senses lower voltage.
The PCM uses the TFT readings to control Torque Converter Clutch (TCC) apply and release, line pressure adjustments, and temperature compensated shifts.
When the PCM detects a continuous open or short to power in the TFT signal circuit or the TFT sensor, then DTC P0713 sets.

Conditions For Setting The DTC
- Ignition is ON.
- TFT voltage is greater than 4.92 volts for 30 seconds.

Action Taken When The DTC Sets
- PCM does not illuminate the Malfunction Indicator Lamp.
- DTC P0713 will be stored in PCM memory.
- Freeze shift adapts from being updated.
- Transmission default temperature will be calculated based on engine coolant temperature, manifold air temperature, and engine run time.

Conditions For Clearing The DTC
- When the TFT voltage is less than 4.92 volts for 3 seconds for three consecutive ignition cycles.
- History DTCs can be cleared by using a Scan Tool.

Diagnostic Aids
- Inspect the wiring for poor electrical connection at the PCM and at the transmission 20-way connector. Look for possible bent, backed out, deformed or damaged terminals. Check for weak terminal tension as well. Also check for chafed wires that could short to bare metal or other wiring. Inspect for broken wire inside the insulation.
- If diagnosing for a possible intermittent short or open condition, move or massage the wiring harness while observing test equipment for a change.





Test Description
The numbers below refer to the step numbers on the diagnostic chart.
3. This test checks the wiring from the transmission 20-way connector to the PCM for an open or short.
4. This test checks circuit 507 from the PCM to the transmission connector.





DTC P0713 - Transmission Fluid Temperature (TFT) Sensor Circuit High Input