4T65-E Automatic Transaxle

DTC P0712





Circuit Description
The automatic transmission fluid temperature (TFT) sensor is a negative coefficient thermistor whose resistance value changes based on temperature. The PCM provides a 5 volt reference to the sensor circuit. A high fluid temperature or a short to ground on the signal circuit results in low signal voltage. The TFT sensor operating range is -40 to +151°C (-40 to +304°F).

If the PCM detects a continuous short to ground in the TFT sensor signal circuit, then DTC P0712 sets. DTC P0712 is a type C DTC.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC
The PCM detects a TFT sensor voltage of 0.2 volts or less for 10 seconds.

Action Taken When the DTC Sets
^ The PCM does not turn on the malfunction indicator lamp (MIL).
^ The PCM freezes transmission adaptive functions.
^ The PCM calculates a default TFT from the ECT sensor and the IAT sensor.
^ 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

Step 1 - Step 7:

Step 8 - Step 12:

The numbers below refers to the step numbers on the diagnostic table.
2. A value below 0.2 volts indicates the fault is present. A value above 0.2 volts indicates the fault is intermittent.
3. A value greater than 4.9 volts indicates the fault is in the transmission side.
5. For resistance at other temperatures, refer to Transmission Fluid Temperature (TFT) Sensor Specifications.