Pinpoint Test F: TSS Sensor

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to the TURBINE SHAFT SPEED (TSS) SENSOR connector illustration within the TRANSAXLE CONNECTOR LAYOUTS procedure.

NOTE: Turbine Shaft Speed (TSS) codes may be a result of bad power and ground circuits shared between the Transmission Range (TR) sensor, Output Shaft Speed (OSS) sensor and TSS sensor.

F1 ELECTRONIC DIAGNOSTICS
- Check to make sure the transaxle vehicle harness C168a is fully seated, terminals are engaged in connector and in good condition before proceeding.
- Have the items above been checked?
1. Yes: GO to F2 .
2. No: CARRY OUT the checks. ERASE the codes. RERUN the On-Board Diagnostic (OBD) tests.
F2 ELECTRONIC DIAGNOSTICS
- Connect the scan tool.
- Monitor the TSS sensor PIDs while test driving the vehicle.
- Are the TSS sensor signal present and consistent?
1. Yes: The condition that set the DTC is intermittent and is not currently present. ERASE the codes. RERUN the OBD tests.
2. No: GO to F3 .

F3 CHECK THE TRANSAXLE VEHICLE HARNESS FOR AN OPEN CIRCUIT

Disconnect: TSS Sensor C168b.
Disconnect: PCM Transaxle Harness C175T.
Use a mirror to inspect both ends of the connectors for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.

Measure the resistance between the TSS C168b and the PCM transaxle C175T.

TURBINE SHAFT SPEED (TSS) SENSOR REFERENCE

Turbine Shaft Speed (TSS) Sensor Circuit	Turbine Shaft Speed (TSS) Sensor	PCM
TSS power supply LE111 (VT/GN)	C168b-3	C175T-1
TSS ground RET24 (BN/BU)	C168b-1	C175T-36
TSS sensor signal VET33 (WH/OG)	C168b-2	C175T-16

Is the resistance less than 5 ohms?

Yes: GO to F4 .
No: REPAIR the circuit(s) for an open. CONNECT all components. TEST the system for normal operation.

F4 CHECK THE TRANSAXLE VEHICLE HARNESS FOR A SHORT TO GROUND

Disconnect: Transaxle Vehicle Harness Connector C168a.

Measure the resistance between TSS C168b and ground.

TURBINE SHAFT SPEED (TSS) SENSOR REFERENCE

Turbine Shaft Speed (TSS) Sensor Circuit	Turbine Shaft Speed (TSS) Sensor	Ground
TSS ground RET24 (BN/BU)	C168b-1	Ground
TSS sensor signal VET33 (WH/OG)	C168b-2	Ground
TSS power supply LE111 (VT/GN)	C168b-3	Ground

Is the resistance greater than 10, 000 ohms?

Yes: GO to F5 .
No: REPAIR the circuit(s) for a short to ground. CONNECT all components. TEST the system for normal operation.

F5 CHECK THE TRANSAXLE VEHICLE HARNESS FOR A SHORT TO POWER

Check for voltage between the TSS sensor C168b and ground.

TURBINE SHAFT SPEED (TSS) SENSOR REFERENCE

Turbine Shaft Speed (TSS) Sensor Circuit	Turbine Shaft Speed (TSS) Sensor	Ground
TSS ground RET24 (BN/BU)	C168b-1	Ground
TSS sensor signal VET33 (WH/OG)	C168b-2	Ground
TSS power supply LE111 (VT/GN)	C168b-3	Ground

Is any voltage present?

Yes: REPAIR the circuit(s) for a short to voltage. CONNECT all components. TEST the system for normal operation.
No: GO to F6 .

F6 CHECK FOR VOLTAGE AND GROUND AT THE TSS SENSOR CONNECTOR
- Connect: PCM C175T.
- Ignition ON.
- Measure the voltage between TSS sensor C168b-1 and C168b-3.
  
  Fig 1: Measuring Voltage Between TSS Sensor C168B-1 And C168B-3
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
1. Yes: INSTALL a new speed sensor. REFER to TURBINE SHAFT SPEED (TSS) . TEST the system for normal operation. If the condition is still present, INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.5L or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) .
2. No: INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.5L or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) . CONNECT all components. TEST the system for normal operation.