Pinpoint Test F: Turbine Shaft Speed (TSS) Sensor And Output Shaft Speed (OSS) Sensor

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to OUTPUT SHAFT SPEED (OSS) SENSOR CONNECTOR or TURBINE SHAFT SPEED (TSS) SENSOR CONNECTOR illustration preceding these pinpoint tests.

F1 ELECTRONIC DIAGNOSTICS
- Check to make sure the transmission harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
- Connect the scan tool.
- Key in ON position.
- Enter the following diagnostic mode on the scan tool: Diagnose Data Link.
- Enter the following diagnostic mode on the scan tool: PCM.
- Select PID/Data Monitor and Record.
- Select the following PIDs: TSS, OSS.
- Does the vehicle enter PID/Data Monitor and Record?
Yes: REMAIN in PID/DATA. GO to F2.

No: RERUN procedure to enter PID. If vehicle did not enter PID, REFER to INTRODUCTION - GASOLINE .
F2 DRIVE CYCLE TEST
- While monitoring the appropriate sensor PID, drive the vehicle so that the transaxle upshifts and downshifts through all the gears.
- Does the TSS or OSS Speed PID increase and decrease with engine and vehicle speed or is the sensor signal erratic (drop to zero or near zero and return to normal operation)?
Yes: If the TSS or OSS Speed PID increase and decrease with engine and vehicle speed, CLEAR all DTCs. ROAD TEST, to VERIFY if concern is still present. If concern is still present, REFER to DIAGNOSIS BY SYMPTOM .

If the sensor signal is erratic, INSPECT for intermittent concern in the external harness, sensor, PCM or connector.

No: If the TSS or OSS Speed PID does not increase and decrease with engine and vehicle speed, the sensor signal is steady. INSPECT for open or short in vehicle harness, sensor, a PCM concern or internal hardware concern. GO to F3.
F3 CHECK CONTINUITY OF TSS OR OSS HARNESS CIRCUITS
CAUTION: Do not pry on the connector. This will damage the connector and can result in a transaxle concern. Press button and pull up on the transaxle vehicle harness connector.
- Key in OFF position.
- Disconnect: OSS or TSS Sensor.
- Disconnect: PCM.
- Inspect for damaged or pushed-out pins, corrosion or loose wires.
- Measure the resistance between the PCM pin T15 and TSS (+) signal circuit, harness side pin 1.
  
  Fig 1: Checking Continuity Of TSS Or OSS Harness Circuits (1 Of 4)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM pin C50 and TSS (-) signal circuit, harness side pin 2.
  
  Fig 2: Checking Continuity Of TSS Or OSS Harness Circuits (2 Of 4)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM pin T4 and OSS (+) signal circuit, harness side pin 2.
  
  Fig 3: Checking Continuity Of TSS Or OSS Harness Circuits (3 Of 4)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM pin C50 and OSS (-) signal circuit, harness side pin 1.
  
  Fig 4: Checking Continuity Of TSS Or OSS Harness Circuits (4 Of 4)
  Courtesy of FORD MOTOR CO.
- Is each resistance less than 5 ohms?
Yes: GO to F4.

No: REPAIR open circuit(s). RECONNECT all components. CLEAR the DTCs. RERUN On-Board Diagnostics.
F4 CHECK TSS CIRCUITS OR OSS CIRCUITS FOR SHORT TO POWER AND GROUND
- Key in OFF position.
- Disconnect: TSS or OSS.
- Measure the resistance between the PCM pin T15 and the PCM pins C35 and C36.
  
  Fig 5: Checking TSS Circuits Or OSS Circuits For Short To Power & Ground (1 Of 5)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM pin T4 and the PCM pins C35 and C36.
  
  Fig 6: Checking TSS Circuits Or OSS Circuits For Short To Power & Ground (2 Of 5)
  Courtesy of FORD MOTOR CO.
- For the TSS and OSS (-), measure the resistance between the PCM pin C50 and the PCM pins C35 and C36.
  
  Fig 7: Checking TSS Circuits Or OSS Circuits For Short To Power & Ground (3 Of 5)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM pin T15 and the PCM pins C47, C48, C49 and C50.
  
  Fig 8: Checking TSS Circuits Or OSS Circuits For Short To Power & Ground (4 Of 5)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM pin T4 and the PCM pins C47, C48, C49 and C50.
  
  Fig 9: Checking TSS Circuits Or OSS Circuits For Short To Power & Ground (5 Of 5)
  Courtesy of FORD MOTOR CO.
- Is each resistance greater than 10,000 ohms?
Yes: GO to F5.

No: REPAIR short circuit(s). RECONNECT all components. ERASE DTCs and RERUN On-Board Diagnostics.
F5 TSS OR OSS FUNCTIONAL TEST
CAUTION: Do not pry on the connector. This will damage the connector and can result in a transaxle concern. Press and pull transaxle vehicle harness connector.
- Connect: PCM.
- Disconnect: TSS or OSS.
- Connect: Transmission Tester.
- Connect the transmission tester to the TSS or OSS sensor.
- Measure the voltage between +TSS or +OSS to -TSS or -OSS. Set VOM to AC.
  
  Fig 10: TSS Or OSS Functional Test
  Courtesy of FORD MOTOR CO.
- Does voltage increase with an increase in vehicle speed?
Yes: INSTALL a new PCM.

No: GO to F6.

F6 CHECK RESISTANCE OF TSS OR OSS SENSOR

NOTE: Refer to transmission tester for terminal locations.

Measure the resistance between +TSS/+OSS jack and -TSS/-OSS jack on the Transmission Tester.

Fig 11: Checking Resistance Of TSS Or OSS Sensor
Courtesy of FORD MOTOR CO.

Record the resistance.

TR SENSOR RESISTANCE TABLE

Sensor	Resistance (Ohms)
TSS	625-1,150
OSS	503-1,010

Is resistance within specification for the appropriate sensor?

Yes: GO to F7.

No: INSTALL a new TSS/OSS sensor. REFER to TURBINE SHAFT SPEED (TSS) SENSOR or OUTPUT SHAFT SPEED (OSS) SENSOR . TEST the system for normal operation.

F7 CHECK SENSOR FOR SHORT TO GROUND
- Measure the resistance between BAT-jack (engine ground) and OSS/TSS (+), OSS/TSS (-) jack on the Transmission Tester.
  
  Fig 12: Checking Sensor For Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes: For TSS, GO to F8.

For OSS, GO to F10.

No: INSTALL a new TSS or OSS sensor. REFER to TURBINE SHAFT SPEED (TSS) SENSOR or OUTPUT SHAFT SPEED (OSS) SENSOR . GO to F5.
F8 CHECK TSS MAGNETISM
- Remove the TSS sensor from transaxle.
- Place the TSS sensor against a metal surface to which it should stick. The TSS sensor should be magnetized and stick to the metal surface.
- Does TSS sensor stick?
Yes: GO to F9.

No: INSTALL a new TSS sensor. REFER to TURBINE SHAFT SPEED (TSS) SENSOR . GO to F5.
F9 CHECK EXCITER WHEEL
NOTE: Make sure a tooth is visible. The exciter wheel will always be visible through the TSS sensor hole.
- Remove the TSS sensor.
- With a remote starter switch, start and stop engine until a tooth of the exciter wheel is visible through the TSS sensor hole.
  
  Fig 13: Checking Exciter Wheel
  Courtesy of FORD MOTOR CO.
- Are all 4 teeth present?
Yes: INSTALL a new TSS sensor. REFER to TURBINE SHAFT SPEED (TSS) SENSOR . TEST the system for normal operation.

No: REPAIR or INSTALL a new exciter wheel as necessary. TEST the system for normal operation.
F10 CHECK OSS MAGNETISM
- Remove OSS sensor from transaxle.
- Place the OSS sensor against a metal surface to which it should stick. The OSS sensor should be magnetized and stick to the metal surface.
- Does the OSS sensor stick?
Yes: The concern is not in the OSS sensor system. REFER to DIAGNOSIS BY SYMPTOM shift concerns for further diagnosis.

No: INSTALL a new OSS sensor. REFER to OUTPUT SHAFT SPEED (OSS) SENSOR .