Pinpoint Test F: Turbine Shaft Speed (TSS) Sensor

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to TURBINE SHAFT SPEED (TSS) SENSOR CONNECTOR for turbine shaft speed sensor harness connector illustration.

F1 ELECTRONIC DIAGNOSTICS
- Check that the turbine shaft speed (TSS) sensor connector is fully seated, terminals are engaged in connector and in good condition before proceeding.
- Have the items above been checked?
  Yes
  
  GO to F2.
  
  No
  
  CARRY OUT the checks. ERASE the codes. RERUN the On-Board Diagnostic Tests.
F2 CHECK THE CONTINUITY OF THE TSS HARNESS CIRCUITS
CAUTION: Do not pry on the connector. This will damage the connector and could result in a transaxle concern. Depress the tab on the TSS connector.
- Key in OFF position.
- Disconnect: TSS.
- Disconnect: PCM.
- Inspect for damaged or pushed out pins, corrosion or loose wires.
- Install the EEC-V Control System Breakout Box.
- Measure the resistance between the PCM signal test pin 6 at the EEC-V Control System Breakout Box and pin 1 TSS(+) signal circuit at the TSS harness connector.
  
  Fig 1: Checking Continuity Of TSS Harness Circuits (1 Of 2)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM signal test pin 91 at the EEC-V Control System Breakout Box and pin 2 TSS(-) signal circuit at the TSS harness connector.
  
  Fig 2: Checking Continuity Of TSS Harness Circuits (2 Of 2)
  Courtesy of FORD MOTOR CO.
- Is each resistance less than 5 ohms?
  Yes
  
  GO to F3.
  
  No
  
  REPAIR the open circuit(s). REMOVE the EEC-V Control System Breakout Box. RECONNECT all of the components. ERASE the codes. RERUN the On-Board Diagnostic Tests.
F3 CHECK THE TSS CIRCUITS FOR SHORT TO POWER AND GROUND
- Key in OFF position.
- Disconnect: PCM.
- Disconnect: TSS.
- Install the EEC-V Control System Breakout Box.
- Measure the resistance between the PCM test pin 6 and test pin 71 at the EEC-V Control System Breakout Box.
Fig 3: Checking TSS Circuits For Short To Power And Ground (1 Of 2)
Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM test pins 6 and test pins 24, 25, 51, 76, 77, 91 and 103 at the EEC-V Control System Breakout Box and chassis ground.
  
  Fig 4: Checking TSS Circuits For Short To Power And Ground (2 Of 2)
  Courtesy of FORD MOTOR CO.
- Is each resistance greater than 10,000 ohms?
  Yes
  
  GO to F4.
  
  No
  
  REPAIR the short circuit(s). REMOVE the EEC-V Control System Breakout Box. CONNECT all of the components. ERASE the codes and RERUN the On-Board Diagnostic Tests.
F4 TRANSMISSION FUNCTIONAL TEST
- Connect: TSS Sensor.
- Install the EEC-V Control System Breakout Box.
- Measure the voltage between pin 6 (TSS+) and pin 91 (TSS-) at the EEC-V Control System Breakout Box. Set the voltmeter to the AC scale.
  
  Fig 5: Transmission Functional Test
  Courtesy of FORD MOTOR CO.
- Monitor the voltmeter while driving the vehicle.
- Does the voltage increase with an increase in vehicle speed?
  Yes
  
  INSTALL a new powertrain control module (PCM).
  
  No
  
  GO to F5.

F5 CHECK THE RESISTANCE OF THE TSS SENSOR

Install the EEC-V Control System Breakout Box.
Measure the resistance between pin 6 (TSS+) and pin 91 (TSS-) at the EEC-V Control System Breakout Box.

Fig 6: Checking Resistance Of TSS Sensor

Courtesy of FORD MOTOR CO.

Record the resistance. The resistance is temperature dependent. Refer to the following chart.

TSS TEMPERATURE/RESISTANCE SPECIFICATIONS

Sensor temperature	Ohms reading
-40°C (-40°F)	223-287 ohms
20°C(68°F)	310-390 ohms
150°C(302°F)	442-566 ohms

Is the resistance within specification according to the chart?
Yes

GO to F6.

No

INSTALL a new TSS sensor. Refer to TURBINE SHAFT SPEED (TSS) SENSOR . RERUN the TSS Function Test.

F6 CHECK THE SENSOR FOR SHORT TO GROUND
- Disconnect: TSS.
- Measure the resistance between +TSS and ground and -TSS and ground. (less than 200 milliamps).
  
  Fig 7: Checking Sensor For Short To Ground
  Courtesy of FORD MOTOR CO.
- Connection should show infinite resistance (no continuity).
- Does the connection show continuity?
  Yes
  
  INSTALL a new TSS sensor. Refer to TURBINE SHAFT SPEED (TSS) SENSOR .
  
  No
  
  GO to F7.
F7 CHECK THE TSS MAGNETISM
- Remove the TSS sensor. Refer to TURBINE SHAFT SPEED (TSS) SENSOR .
- Place the TSS sensor against a metal surface to which a magnet would stick. The TSS sensor should be magnetized and stick to the metal surface.
- Does the TSS sensor stick?
  Yes
  
  GO to F8.
  
  No
  
  INSTALL a new TSS sensor. Refer to TURBINE SHAFT SPEED (TSS) SENSOR . RERUN the TSS Function Test.
F8 CHECK THE DRIVEN SPROCKET AND EXCITER WHEEL
- Remove the TSS sensor. Refer to TURBINE SHAFT SPEED (TSS)
- Select NEUTRAL.
- Rotate the engine and observe through the TSS sensor hole in the chain cover that all four tabs in the exciter wheel are present and free of foreign material.
  
  Fig 8: Checking Driven Sprocket And Exciter Wheel
  Courtesy of FORD MOTOR CO.
- Measure the depth of the exciter wheel tooth from the outer edge of the chain cover. The distance should be within specification: 18.65-16.92 mm (0.73-0.67 inch). Mark the tooth with a marker and repeat the measurements for the other teeth.
- Are the tabs present and free of foreign material and is depth within specification?
  Yes
  
  INSTALL a new TSS sensor. RFFFR to TURBINE SHAFT SPEED (TSS) . RERUN the TSS Function Test.
  
  No
  
  Refer to TRANSAXLE to repair the output shaft ring gear. REPAIR or INSTALL new as required.