Pinpoint Test E: Turbine Shaft Speed (TSS), Intermediate Shaft Speed And Output Shaft Speed (OSS) Sensors

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to the Figure, Figure and Figure preceding these pinpoint tests.

E1 ELECTRONIC DIAGNOSTICS
- Check to make sure the transmission harness connectors are 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: Diagnostic Data Link.
- Enter the following diagnostic mode on the scan tool: PCM.
- Select PID/Data Monitor and Record.
- Select the following PIDs: TSS, Intermediate shaft speed sensor or OSS.
- Does vehicle enter PID/Data Monitor and Record?
- Yes : REMAIN in PID/Data. GO to E2.
- No : REPEAT procedure to ENTER PID. If vehicle did not enter PID, See INTRODUCTION - GASOLINE article for diagnosis of PCM or NGS.
E2 DRIVE CYCLE TEST
- While monitoring the appropriate sensor PID, drive the vehicle so that the transmission upshifts and downshifts through all gears.
- Does the TSS, Intermediate shaft speed sensor or OSS Speed PID increase and decrease with engine and vehicle speed?
- Yes : GO to E3.
- No : If the TSS, Intermediate shaft speed sensor or OSS Speed PID does not increase and decrease with engine and vehicle speed, INSPECT for open or short in vehicle harness, sensor, a PCM concern or internal hardware concern. GO to E4.
E3 DRIVE CYCLE TEST ERRATIC
- While monitoring the appropriate sensor PID, drive the vehicle so that the transmission upshifts and downshifts through all gears.
- Is the TSS, Intermediate shaft speed sensor or OSS Speed PID signal erratic (drop to zero or near zero and return to normal operation)?
- Yes : If the sensor signal is erratic, INSPECT for intermittent concern in the harness, sensor or connector. GO to E4.
- No : CLEAR all DTCs. RERUN OBD test.
E4 CHECK THE PCM HARNESS CIRCUITS FOR OPENS
- Key in OFF position.
- Disconnect: PCM Connector "T".
- For the OSS, measure the resistance between PCM pin 3 and the appropriate sensor connector pin 2 harness side.
  
  Fig 1: Measuring Resistance Between PCM Pin 3 And Appropriate Sensor Connector Pin
  Courtesy of FORD MOTOR CO.
- For the intermediate shaft speed sensor, measure the resistance between PCM pin 41 and the appropriate sensor connector pin 2 harness side.
  
  Fig 2: Measuring Resistance Between PCM Pin 41 And Appropriate Sensor Connector
  Courtesy of FORD MOTOR CO.
- For the TSS, measure the resistance between PCM pin 41 and the appropriate sensor connector pin 2 harness side.
  
  Fig 3: Measuring Resistance Between PCM Pin 41 And Appropriate Sensor Connector Pin 2
  Courtesy of FORD MOTOR CO.
- For the intermediate shaft speed sensor, measure the resistance between PCM pin 4 and the appropriate sensor connector pin 1 harness side.
  
  Fig 4: Measuring Resistance Between PCM Pin 4 And Appropriate Sensor Connector Pin 1
  Courtesy of FORD MOTOR CO.
- For the TSS, measure the resistance between PCM pin 15 and the appropriate sensor connector pin 1 harness side.
  
  Fig 5: Measuring Resistance Between PCM Pin 15 And Appropriate Sensor Connector Pin 1
  Courtesy of FORD MOTOR CO.
- For the OSS, measure the resistance between PCM pin 3 and the appropriate sensor connector pin 1 harness side.
  
  Fig 6: Measuring Resistance Between PCM Pin 3 And Appropriate Sensor Connector Pin 1
  Courtesy of FORD MOTOR CO.
- Are all resistances less than 5 ohms?
- Yes : GO to E5.
- No : REPAIR the circuit. TEST the system for normal operation.
E5 CHECK THE PCM HARNESS CIRCUITS FOR A SHORT TO GROUND
- For the OSS, measure the resistance between PCM pin 3 and sensor connector pin 1 harness side and ground.
  
  Fig 7: Measuring Resistance Between PCM Pin 3 And Sensor Connector Pin 1 Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- For the intermediate shaft speed sensor, measure the resistance between PCM pin 4 and sensor connector pin 1 harness side and ground.
  
  Fig 8: Measuring Resistance Between PCM Pin 4 And Sensor Connector Pin 1 Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- For the TSS, measure the resistance between PCM pin 15 and sensor connector pin 1 harness side and ground.
  
  Fig 9: Measuring Resistance Between PCM Pin 15 And Sensor Connector Pin 1 Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances greater than 10,000 ohms?
- Yes : GO to E6.
- No : REPAIR the circuits. TEST the system for normal operation. CLEAR DTCs. RERUN OBD Tests.

E6 CHECK THE RESISTANCE OF THE TSS, THE INTERMEDIATE SHAFT SPEED SENSOR OR THE OSS SENSOR

Disconnect the appropriate vehicle harness connector from the TSS, intermediate shaft speed sensor or OSS sensor.
Connect ohmmeter negative lead to one pin of the sensor and the positive lead to the other pin on the sensor.

Fig 10: Measuring Sensor Resistance
Courtesy of FORD MOTOR CO.

Record the resistance. Resistance should be as follows:

TSS, OSS & INTERMEDIATE SHAFT SPEED SENSOR RESISTANCE CHART

Resistance (ohms)	Temperature °C (°F)
266-390	-20° (4°)
325-485	21° (70°)
492-738	150° (302°)

Is the resistance within specification for the appropriate sensor?

Yes : GO to E7.
No : INSTALL a new sensor.

E7 CHECK SENSORS FOR A SHORT TO GROUND
- Measure the resistance between pin 1 and 2 of each sensor and ground.
  
  Fig 11: Measuring Resistance Between Each Sensor Terminal And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 10,000 ohms?
- Yes : INSTALL a new sensor.
- No : REFER to DIAGNOSIS BY SYMPTOM for diagnosis of shift or torque converter concerns.