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

Test Step 

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, ISS, or OSS.
• Does vehicle enter PID/Data Monitor and Record? 

Result / Action to Take 

Yes 

REMAIN in PID/Data. GO to E2.

No 

REPEAT procedure to ENTER PID. If vehicle did not enter PID, REFER to the INTRODUCTION article in ENGINE PERFORMANCE.

Test Step 

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, ISS, or OSS Speed PID increase and decrease with engine and vehicle speed? 

Result / Action to Take 

Yes 

GO to E3.

No 

If the TSS, ISS, 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.

Test Step 

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, ISS, or OSS Speed PID signal erratic (drop to zero or near zero and return to normal operation)? 

Result / Action to Take 

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 Step 

E4 CHECK PCM HARNESS CIRCUITS FOR OPENS 

• Key in OFF position.
• Disconnect: 150 Pin PTEC Module Connector "B".
• Inspect for damaged or pushed out pins, corrosion or loose wires.
• For OSS, measure the resistance between pin 17 and the appropriate sensor connector pin 2 harness side.
  Fig 1: Checking PCM Harness Circuits For Opens - OSS (Pin 17 & Sensor Connector Pin 2)

  Courtesy of FORD MOTOR CO.
• For ISS, measure the resistance between pin 17 and the appropriate sensor connector pin 2 harness side.
  Fig 2: Checking PCM Harness Circuits For Opens - ISS (Pin 17 & Sensor Connector Pin 2)

  Courtesy of FORD MOTOR CO.
• For TSS, measure the resistance between pin 17 and the appropriate sensor connector pin 2 harness side.
  Fig 3: Checking PCM Harness Circuits For Opens - TSS (Pin 17 & Sensor Connector Pin 2)

  Courtesy of FORD MOTOR CO.
• For ISS, measure the resistance between pin 21 and the appropriate sensor connector pin 1 harness side.
  Fig 4: Checking PCM Harness Circuits For Opens - ISS (Pin 21 & Sensor Connector Pin 1)

  Courtesy of FORD MOTOR CO.
• For TSS, measure the resistance between pin 27 and the appropriate sensor connector pin 1 harness side.
  Fig 5: Checking PCM Harness Circuits For Opens - TSS (Pin 27 & Sensor Connector Pin 1)

  Courtesy of FORD MOTOR CO.
• For OSS, measure the resistance between pin 26 and the appropriate sensor connector pin 1 harness side.
  Fig 6: Checking PCM Harness Circuits For Opens - OSS (Pin 26 & Sensor Connector Pin 1)

  Courtesy of FORD MOTOR CO.
• Are all resistances less than 5 ohms? 

Result / Action to Take 

Yes 

GO to E5.

No 

REPAIR the circuit. TEST the system for normal operation.

Test Step 

E5 CHECK PCM HARNESS CIRCUITS FOR SHORT TO GROUND 

• For OSS, measure the resistance between pin 26 and sensor connector pin 1 harness side and ground.
  Fig 7: Measuring Resistance Between Pin 26 And Sensor Connector Pin 1 Harness Side And Ground

  Courtesy of FORD MOTOR CO.
• For ISS, measure the resistance between PCM pin 21 and sensor connector pin 1 harness side and ground.
  Fig 8: Measuring Resistance Between PCM Pin 21 And Sensor Connector Pin 1 Harness Side And Ground

  Courtesy of FORD MOTOR CO.
• For TSS, measure the resistance between PCM pin 27 and sensor connector pin 1 harness side and ground.
  Fig 9: Measuring Resistance Between PCM Pin 27 And Sensor Connector Pin 1 Harness Side And Ground

  Courtesy of FORD MOTOR CO.
• Are the resistances greater than 10,000 ohms? 

Result / Action to Take 

Yes 

GO to E6.

No 

REPAIR the circuits. TEST the system for normal operation. CLEAR DTCs. RERUN OBD Tests.

Test Step 

E6 CHECK RESISTANCE OF TSS, ISS or OSS SENSOR 

• Disconnect the appropriate vehicle harness connector from the TSS, ISS 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: Checking Resistance Of TSS, ISS Or OSS Sensor

  Courtesy of FORD MOTOR CO.
• Record the resistance. Resistance should be as follows:
  SENSOR RESISTANCE/TEMPERATURE SPECIFICATIONS (OHMS)
  
  

  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? 

Result / Action to Take 

Yes 

GO to E7.

No 

INSTALL a new sensor.

Test Step 

E7 CHECK SENSORS FOR SHORT TO GROUND 

• Measure the resistance between pin 1 and 2 of each sensor and ground.
  Fig 11: Checking Sensors For Short To Ground (Pin 1 & 2 Of Each Sensor And Ground)

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 10,000 ohms? 

Result / Action to Take 

Yes 

INSTALL a new sensor.

No 

refer to DIAGNOSIS BY SYMPTOM  for diagnosis of shift or torque converter concerns.