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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 474 (Automatic Transmission) >> Diagnosis And Testing >> Pinpoint Tests - OSC Equipped Vehicles >> Pinpoint Tests >> Pinpoint Test E: Turbine Shaft Speed (TSS), Intermediate Shaft Speed (ISS) And Output Shaft Speed (OSS) Sensors

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

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the PINPOINT TEST E: TURBINE SHAFT SPEED (TSS), INTERMEDIATE SHAFT SPEED (ISS) AND OUTPUT SHAFT SPEED (OSS) SENSORS  connector illustrations preceding these pinpoint tests.
  1. E1 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 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, OSS.
    • Does vehicle enter PID/Data Monitor and Record? 
    1. Yes  : REMAIN in PID/Data. GO to E2.
    2. No  : REPEAT procedure to ENTER PID.

      If vehicle did not enter PID, REFER to the INTRODUCTION - CNG, FLEX-FUEL & GASOLINE article for diagnosis of PCM.

  2. 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 or is the sensor signal erratic (drop to zero or near zero and return to normal operation)? 
    1. Yes  : If the TSS, ISS 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 the DIAGNOSIS BY SYMPTOM INDEX  in DIAGNOSIS BY SYMPTOM  for diagnosis.

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

    2. 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.

      If the sensor signal is steady, GO to E3.

  3. E3 CHECK RESISTANCE OF TSS, ISS OR OSS SENSOR 
    • Disconnect the appropriate vehicle harness connector from the ISS or OSS sensor. For the TSS sensor, disconnect the vehicle harness connector from the transmission.
    • For ISS or OSS: Connect ohmmeter negative lead to one pin of the sensor and the positive lead to the other pin on the sensor.
      Fig 1: Checking Resistance Of ISS Or OSS Sensor
      G03275405Courtesy of FORD MOTOR CO.
    • For TSS: Connect ohmmeter negative lead to the signal return pin and the positive lead to the TSS signal at the transmission connector.
      • Fig 2: Checking Resistance Of TSS Sensor
      G03275406Courtesy of FORD MOTOR CO.
    • Record the resistance. Resistance should be as follows:
      SENSOR RESISTANCE SPECIFICATIONS

      Sensor Resistance (ohms)
      TSS 64-126
      ISS 325-615
      OSS 305-735
    • Is the resistance within specification for the appropriate sensor? 
    1. Yes  : REFER to the DIAGNOSIS BY SYMPTOM INDEX  in DIAGNOSIS BY SYMPTOM  for concern diagnosis.
    2. No  : INSTALL a new sensor.
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