Pinpoint Test G : Transmission Fluid Temperature Sensor: Notes
Diagnostic Overview
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Service Information for information about these practices.
Refer to Transmission Controls - 6F50/6F55 for schematic and connector information.
Normal Operation and Fault Conditions
The TFT sensor is located in the transmission solenoid body. The resistance value of the TFT sensor varies with temperature change. The PCM monitors the voltage drop across the TFT sensor to determine the temperature of the transmission fluid. When the ignition is turned to the RUN position, the PCM uses this initial input signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule allows delayed shifts when the transmission fluid is cold. The PCM inhibits TCC operation at low transmission fluid temperatures and adjusts line pressure to temperature.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0710 | Transmission Fluid Temperature Sensor "A" Circuit | TFT sensor circuit shorted to ground or open. |
| P0711 | Transmission Fluid Temperature Sensor "A" Circuit Range/Performance | TFT sensor indicates a valid temperature but has not changed since start up. |
| P0712 | Transmission Fluid Temperature Sensor "A" Circuit Low | TFT sensor circuit short to ground. |
| P0713 | Transmission Fluid Temperature Sensor "A" Circuit High | TFT sensor circuit open. |
| P1711 | Transmission Fluid Temperature Sensor Out Of Self-Test Range | TFT sensor indicates too hot or too cold and must indicate a normal temperature range during KOER. |
| P1783 | Transmission Overtemperature Condition | The TFT sensor indicates that the transmission is approaching an overheating condition. |
Possible Sources
- Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
- TFT sensor
- PCM