P0712

DTC P0712

Schematic:

Circuit Description
The automatic Transmission Fluid Temperature (TFT) sensor is a thermistor. The TFT sensor is part of the automatic Transmission Fluid Pressure (TFP) manual valve position switch. The PCM supplies a 5-volt reference signal to the sensor. When the transmission fluid is cold, the sensor resistance is high and the PCM senses a high signal voltage. As the transmission fluid warms, the sensor resistance lowers and the PCM senses lower voltage. The PCM uses the TFT reading in order to control the Torque Converter Clutch (TCC), line pressure adjustments, and temperature compensated shifts.
When the PCM detects a continuous short to ground in the TFT circuit or the TFT sensor, then DTC P0712 sets. DTC P0712 is a type C DTC.

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

Conditions for Setting the DTC
The TFT voltage is 0.33 volts or less for 10 seconds.

Action Taken When the DTC Sets
- The PCM does not illuminate the Malfunction Indicator Lamp (MIL).
- The PCM freezes transmission adapt functions.
- The PCM calculates a default transmission fluid temperature based on engine coolant temperature, intake manifold air temperature, and engine run time.
- The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
- The PCM stores DTC P0712 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 the DTC passes.

Test Description

Steps 1-9:

Steps 10-11:

The numbers below refer to the step numbers on the diagnostic table.
3. This step tests the ability of the PCM to detect an open circuit.
5. This step tests the TFT sensor for correct resistance.