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 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to the TURBINE SHAFT SPEED (TSS) SENSOR , OUTPUT SHAFT SPEED (OSS) SENSOR and INTERMEDIATE SHAFT SPEED SENSOR HARNESS CONNECTOR 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 diagnostic tool.
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Diagnostic Data Link.
- Enter the following diagnostic mode on the diagnostic 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, REFER to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE 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 PCM HARNESS CIRCUITS FOR OPENS
- Key in OFF position.
- Disconnect: PCM Connector "T".
- For 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 2 Harness Side
  Courtesy of FORD MOTOR CO.
- For 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 Pin 2 Harness Side
  Courtesy of FORD MOTOR CO.
- For 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 1 Harness Side
  Courtesy of FORD MOTOR CO.
- For 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 Harness Side
  Courtesy of FORD MOTOR CO.
- For 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 Connector Sensor Pin 1 Harness Side
  Courtesy of FORD MOTOR CO.
- For OSS, measure the resistance between PCM pin 3 and the appropriate connector sensor pin 1 harness side.
  
  Fig 6: Measuring Resistance Between PCM Pin 3 And Sensor Connector Pin 1 Harness Side And Ground
  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 PCM HARNESS CIRCUITS FOR SHORT TO GROUND
- For 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 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 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 RESISTANCE OF TSS, INTERMEDIATE SHAFT SPEED SENSOR OR 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 Resistance Between Pin 1 And 2 Of Sensor And Ground
Courtesy of FORD MOTOR CO.

Record the resistance. Resistance should be as follows:

RESISTANCE REFERENCE

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.

INSTALL a new sensor.

E7 CHECK SENSORS FOR SHORT TO GROUND
- Measure the resistance between pin 1 and 2 of each sensor and ground.
  
  Fig 11: Measuring Resistance Between Pin 1 And 2 Of Sensor 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.