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 volt 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
The numbers below refer to the step numbers on the diagnostic table.
2. A value below 0.2 volt indicates the fault is present. A value above 0.2 volt 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.
