P0712

Schematic:

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 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 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 consecutive 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 ignition switch is OFF long enough in order to power down the PCM.

DIAGNOSTIC AIDS
^ Inspect the connectors at the controller, the component and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent and Poor Connections in Diagrams.
^ Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents in Diagrams.


TEST DESCRIPTION

Steps 1 - 6:

Steps 7 - 11:

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 circuit and the ground circuit.