Pinpoint Test D : TSS (Turbine Shaft Speed) Sensor

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Transmission Controls - 6R80 for schematic and connector information.

Normal Operation and Fault Conditions

The TSS sensor is a Hall-effect type sensor that provides a signal to the PCM that changes in frequency as the rotating speed of the forward (1, 2, 3, 4) clutch cylinder varies. The PCM compares the TSS sensor signal with the engine speed information to determine the amount of slip occurring in the torque converter. The PCM also compares the TSS sensor signal with the OSS sensor signal to determine the gear ratio provided by the rear planetary gearset. The PCM uses the TSS sensor signal as an input for its strategies for shifts and TCC operation. The PCM also uses the TSS sensor signal for transmission fault detection and diagnostics. REFER to: Transmission Description - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P0715:00	Input/Turbine Shaft Speed Sensor "A" Circuit: No Sub Type Information	This DTC indicates the TSS sensor reads 0 speed when vehicle conditions (mainly the OSS sensor) indicate the turbine shaft should be rotating. This could be caused by an open circuit, a short to ground or a short to power in the TSS sensor circuit, or by a failed sensor.
PCM P0717:00	Input/Turbine Shaft Speed Sensor "A" Circuit No Signal: No Sub Type Information	This DTC illuminates the wrench light in conjunction with P0715. Resolve the more specific DTC first.
PCM P0718:00	Input/Turbine Shaft Speed Sensor "A" Circuit Intermittent: No Sub Type Information	This DTC indicates an unrealistic change or an intermittent/noisey signal from the TSS sensor. This could be caused by an intermittent open circuit, short to ground or short to power in the TSS sensor circuit, or by a failed sensor.

Possible Sources

Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
Transmission internal wiring harness molded leadframe
PCM

D1 DRIVE CYCLE TEST

NOTE: Read and record all DTCs.

NOTE: If DTCs P0705, P0706, P0707, P0708, P0709, P1702, P1705 and/or P1921 are set, diagnose those DTCs first.
- Enter the following diagnostic mode: TSS PID: TSS_SRC.
- Monitor the PID TSS_SRC while road testing the vehicle. Drive the vehicle so the transmission upshifts and downshifts through all the gears.
Does the TSS sensor rpm steadily increase and decrease with engine rpm and vehicle speed?

Yes The TSS sensor is working correctly at this time.

No GO to D2

D2 CHECK THE TSS SENSOR SIGNAL CIRCUIT FOR POWER

Ignition OFF.

Disconnect Transmission vehicle harness C1575.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1575-1	Courtesy of FORD MOTOR COMPANY	Ground

Is voltage present?

Yes

GO to D5

GO to D3

D3 CHECK THE TSS SENSOR SIGNAL CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: PCM C1551T

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

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1575-1	Courtesy of FORD MOTOR COMPANY	C1551T-38

Is the resistance less than 3 ohms?

Yes

GO to D4

No	REPAIR the circuit.

D4 CHECK THE TSS SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1575-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes	Refer to PCM Guided Routine Testing . After installing a new PCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download .

No	REPAIR the circuit.

D5 CHECK TSS SENSOR VPWR AND TR GND CIRCUITS

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1575-12	Courtesy of FORD MOTOR COMPANY	C1575-11

Is the voltage greater than 11 volts?

Yes	INSTALL a new molded leadframe. REFER to: Shift Solenoids (SS) .

No	INSPECT and REPAIR transmission vehicle harness TSS sensor power and ground circuits for an open. If an open circuit is not found, Refer to PCM Guided Routine Testing . After installing a new PCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download .