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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 879 (Automatic Transmission - 5R110W -- F250-F550 Super Duty) >> Diagnostic Tests >> Pinpoint Tests - OSC Equipped Vehicle >> Pinpoint Tests >> Pinpoint Test D: Turbine Shaft Speed (TSS), Intermediate Shaft Speed And Output Shaft Speed (OSS) Sensors

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

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Transmission Vehicle Harness Connector illustration preceding these pinpoint tests.
NOTE: Refer to the Internal Harness Connector illustration preceding these pinpoint tests.
NOTE: Read and record all DTCs.
NOTE: Use the PID Chart for available diagnostic PIDs. Refer to Output State Control (OSC) Mode  in this article.
  1. D1 ELECTRONIC DIAGNOSTICS 
    • Check to make sure the transmission harness connectors are fully seated, terminals are fully engaged in the connector and in good condition before proceeding.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Data Logger or Diagnostic Data Link
    • Select and monitor the appropriate PID for the suspected sensor(s): turbine shaft speed (TSS), intermediate shaft speed sensor or output shaft speed (OSS) sensor.
      PID Description Value
      ISS_SRC Raw ISS signal RPM
      OSS_SRC Raw OSS signal RPM
      TSS_SRC Raw TSS signal RPM
    • Can you select and monitor the appropriate sensor(s)? 
    1. YES  : Continue to monitor the suspect sensor(s). Go to  D2 .
    2. NO  : REPEAT procedure to ENTER PID. If you cannot monitor the sensor(s) using the diagnostic equipment, REFER to the INTRODUCTION - GASOLINE ENGINES article for diagnosis of the powertrain control module (PCM).
  2. D2 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 PID increase and decrease with engine and vehicle speed? 
    1. YES  : Go to  D3.
    2. NO  : If the TSS, intermediate shaft speed sensor or OSS PID does not increase and decrease with engine and vehicle speed, the issue may be found with the vehicle harness, PCM, sensor or internal hardware. Go to  D4 .
  3. D3 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)? 
    1. YES  : If the sensor signal is erratic, there may be an intermittent concern in the vehicle harness sensor or connector. Go to  D4 .
    2. NO  : CLEAR all DTCs. RERUN the OBD Test.
  4. D4 CHECK FOR SENSOR BATTERY VOLTAGE 
    • Key in OFF position.
    • Disconnect: Speed Sensor
    • Inspect for damaged or pushed-out pins, corrosion or loose wires.
    • Key in ON position.
    • For OSS, measure the voltage between sensor connector pin 1 and ground.
    • For TSS/intermediate shaft speed sensor, measure the voltage between sensor connector pin 1 and ground.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  D5.
    2. NO  : Repair the circuit. TEST the system for normal operation. CLEAR all DTCs. RERUN the OBD Tests.
  5. D5 CHECK THE PCM HARNESS CIRCUITS FOR AN OPEN 
    • Disconnect: Transmission PCM Connector from the PCM.
    • For intermediate shaft speed sensor, measure the resistance between the appropriate pin at the transmission PCM connector, harness side and the sensor connector pin 4, harness side.
    • For TSS, measure the resistance between the appropriate pin at the transmission PCM connector, harness side and the sensor connector pin 3, harness side.
    • For intermediate shaft speed sensor/TSS, measure the resistance between the appropriate pin at the PCM connector, harness side and the sensor connector pin 1, harness side.
    • For intermediate shaft speed sensor/TSS, measure the resistance between the appropriate pin at the PCM connector, harness side and the sensor connector pin 2, harness side.
    • For OSS, measure the resistance between the appropriate pin at the PCM connector, harness side and the sensor connector pin 1, harness side.
    • For OSS, measure the resistance between the appropriate pin at the PCM connector, harness side and the sensor connector pin 3, harness side.
    • For OSS, measure the resistance between the appropriate pin at the PCM connector, harness side and sensor connector pin 2, harness side and ground.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  D6.
    2. NO  : REPAIR the open circuits. TEST the system for normal operation. CLEAR all DTCs. RERUN the OBD Tests.
  6. D6 CHECK THE PCM HARNESS CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: Transmission PCM Connector from PCM.
    • Measure the resistance between TSS/intermediate shaft speed sensor connector pins 1, 2, 3 and 4 and ground.
    • Measure the resistance between OSS sensor connector pins 1, 2 and 3 and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  D7.
    2. NO  : REPAIR the short circuits. TEST the system for normal operation. CLEAR all DTCs. RERUN the OBD Tests.
  7. D7 CHECK THE SENSORS FOR A SHORT TO GROUND 
    • Measure the resistance between pins 2 and 1, 3 and ground for the OSS sensor.
    • Measure the resistance between pins 2 and 1, 4 and ground for the intermediate shaft speed sensor.
    • Measure the resistance between pins 2 and 1, 3 and ground for the TSS sensor.
    • Is the resistance less than 10,000 ohms? 
    1. YES  : INSTALL a new sensor. TEST the system for normal operation.
    2. NO  : INSTALL a new PCM.
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