Built Before 6/17/96

Diagnostic Chart:

Wiring Diagram:

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 +151°C (-40 to +304°F).

If 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

^ The system voltage is 10-16 volts.
^ The ignition is ON.
^ The PCM detects a TFT Sensor voltage of 4.92 volts or more for 7 minutes.

ACTION TAKEN WHEN THE DTC SETS

^ The default TFT is 131°C (268°F).
^ 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 connection at the PCM. Inspect the wiring at the transmission 7-way connector. Look for the following problems:

- A bent terminal.
- A backed out terminal.
- A damaged terminal.
- Poor terminal tension.
- A chafed wire.

^ When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
^ Refer to Temperature vs Resistance. Specifications

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.