Pinpoint Test A : Transmission Fluid Temperature Sensor

WARNING: This page is about a different variant/trim than selected.

Refer to Electronic Engine Controls - 5.2L for schematic and connector information.

Normal Operation and Fault Conditions

The TFT sensor is located on the side of the manual transmission. 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.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P0711:00	Transmission Fluid Temperature Sensor "A" Circuit Range/Performance: No Sub Type Information	This DTC indicates the TFT sensor is stuck. It is reading within range, but the PCM detected no change when the vehicle was driven enough that the transmission fluid temperature should have changed.
PCM P0712:00	Transmission Fluid Temperature Sensor "A" Circuit Low: No Sub Type Information	This DTC indicates an open or a short to ground in the TFT sensor circuit.
PCM P0713:00	Transmission Fluid Temperature Sensor "A" Circuit High: No Sub Type Information	This DTC indicates an open circuit in the TFT sensor circuit.

Possible Sources

Low transmission fluid level
Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
TFT sensor
PCM

A1 RETRIEVE AND RECORD ALL DTCS

Using a diagnostic scan tool, carry out the PCM self-test.

Are any TFT sensor circuit diagnostic trouble codes (DTCs) present?

Yes

GO to A2

No	CHECK the transmission fluid level. ADJUST the transmission fluid level as necessary. REFER to: Transmission Fluid Level Check . If the transmission fluid level is OK, REFER to Symptom Chart .

A2 CHECK THE TFT (TRANSMISSION FLUID TEMPERATURE) SENSOR SIGNAL INPUT CIRCUIT FOR VOLTAGE

Ignition OFF.

Disconnect TFT sensor C1468.

Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1468-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage between 4.8 and 5.1 volts?

Yes

GO to A5

GO to A3

A3 CHECK THE TFT (TRANSMISSION FLUID TEMPERATURE) SENSOR SIGNAL INPUT CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect PCM C1381E.

Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1468-1	Courtesy of FORD MOTOR COMPANY	C1381E-24

Is the resistance less than 3 ohms?

Yes

GO to A4

No	REPAIR the circuit.

A4 CHECK THE TFT (TRANSMISSION FLUID TEMPERATURE) SENSOR SIGNAL INPUT CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1468-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes	Refer to PCM Guided Routine Testing .

No	REPAIR the circuit.

A5 CHECK THE TFT (TRANSMISSION FLUID TEMPERATURE) SENSOR SIGNAL RETURN CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect PCM C1381B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1468-2	Courtesy of FORD MOTOR COMPANY	C1381B-51

Is the resistance less than 3 ohms?

Yes

GO to A6

No	REPAIR the circuit.

A6 CHECK THE TFT (TRANSMISSION FLUID TEMPERATURE) SENSOR SIGNAL RETURN CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1468-2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes	INSTALL a new TFT sensor. REFER to: Transmission Fluid Temperature (TFT) Sensor .

No	REPAIR the circuit.