Pinpoint Test D : TSS (Turbine Shaft Speed) Sensor

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

Transmission Controls - TorqShift 6 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 sets if the PCM detects an open, a short to ground or a short to power condition in the TSS sensor circuitry.
PCM P0717:00	Input/Turbine Shaft Speed Sensor "A" Circuit No Signal: No Sub Type Information	This DTC sets relationally if the DTC P0715 is set, RESOLVE this DTCs first.
PCM P0718:00	Input/Turbine Shaft Speed Sensor "A" Circuit Intermittent: No Sub Type Information	This DTC sets if the PCM detects an intermittent open, an intermittent short to ground or an intermittent short to power condition in the TSS sensor circuitry.

Possible Sources

Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
Transmission internal wiring harness
TSS sensor
PCM fault

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.
- Connect the diagnostic tool.
- Enter the following diagnostic mode: 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 concern is not present at this time.

No GO to D2

D2 CHECK THE TSS SIGNAL CIRCUIT FOR VOLTAGE

Ignition OFF.

Disconnect Transmission Vehicle Harness C1623.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C1623-11	Courtesy of FORD MOTOR COMPANY	Ground

Is voltage present?

Yes

GO to D5

GO to D3

D3 CHECK THE TSS SIGNAL CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect PCM C175E.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C1623-11	Courtesy of FORD MOTOR COMPANY	Refer to C175E-25

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
Refer to C1623-11	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 THE TRANSMISSION INTERNAL WIRING HARNESS FOR AN OPEN

Remove the transmission fluid pan and filter. REFER to: Transmission Fluid Pan, Gasket and Filter .

Disconnect the TSS sensor connector.

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

Measure the resistance of the TSS sensor circuits between the transmission bulkhead connector and the TSS sensor connector:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY TSS sensor connector, harness side, Pin 1	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY Transmission component side, Pin 10
Courtesy of FORD MOTOR COMPANY TSS sensor connector, harness side, Pin 3	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY Transmission component side, Pin 11
Courtesy of FORD MOTOR COMPANY TSS sensor connector, harness side, Pin 4	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY Transmission component side, Pin 12

Are the resistances less than 3 ohms?

Yes

GO to D6

No	INSTALL a new transmission internal wiring harness. REFER to: Transmission Internal Wiring Harness .

D6 CHECK THE TRANSMISSION INTERNAL WIRING HARNESS FOR A SHORT TO GROUND

Measure the resistance between the TSS sensor circuits and ground:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY TSS sensor connector, harness side, Pin 1	Courtesy of FORD MOTOR COMPANY	Ground
Courtesy of FORD MOTOR COMPANY TSS sensor connector, harness side, Pin 3	Courtesy of FORD MOTOR COMPANY	Ground
Courtesy of FORD MOTOR COMPANY TSS sensor connector, harness side, Pin 4	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes	INSTALL a new TSS sensor. REFER to: Turbine Shaft Speed (TSS) Sensor .

No	INSTALL a new transmission internal wiring harness. REFER to: Transmission Internal Wiring Harness .