4T65-E Automatic Transaxle

DTC P0712












Circuit Description with 4T65-E Automatic Transaxle
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 sensor signal circuit results in low signal voltage. The TFT sensor operating range is -40°C to +151°C (-40°F 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.

Conditions for Running the DTC
The system voltage is 9 - 18 volts.

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

Action Taken When the DTC Sets
^ The PCM does not turn on the malfunction indicator lamp (MIL).
^ The PCM freezes shift adapts.
^ 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 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.
6. A value less than 10 K Ohms indicates a short to ground in the harness or sensor. A value greater than 10 K Ohms indicates the condition is intermittent.
7. A value less than 10 K Ohms indicates a short together between the TFT signal and ground circuits.