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Pinpoint Test I: TSS, Intermediate Shaft Speed And OSS Sensors

WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 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 in Transmission Connector Layouts .
NOTE: Refer to the Transmission Internal Harness Connector illustration in Transmission Connector Layouts .
NOTE: Read and record all DTCs.
NOTE: Use the PID Chart for available diagnostic PIDs. Refer to Diagnostic Parameters Identification (PID) Chart .
  1. I1 ELECTRONIC DIAGNOSTICS 
    • Select PARK.
    • Key in OFF position.
    • Check to make sure the transmission vehicle harness C1385, Output Shaft Speed (OSS)C193 and Turbine Shaft Speed (TSS)/Intermediate Shaft Speed Sensor C1387 are fully seated, terminals are fully engaged in the connector and are in good condition before proceeding.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: PID List
    • 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 intermediate shaft speed 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  I2.
    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 or INTRODUCTION - 6.4L DIESEL ENGINES article for diagnosis of the TCM.
  2. I2 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  I3.
    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, TCM, sensor or internal hardware. Go to  I4 .
  3. I3 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  I4 .
    2. NO  : CLEAR the DTCs. RERUN On-Board Diagnostic (OBD) Test.
  4. I4 CHECK FOR SENSOR BATTERY VOLTAGE 
    • Key in OFF position.
    • Disconnect: OSS sensor C193
    • Disconnect: TSS/Intermediate Shaft Speed Sensor C1387
    • Inspect for damaged or pushed-out pins, corrosion or loose wires.
    • Key in ON position.
      • Fig 1: Checking For Sensor Battery Voltage - OSS
      GF0044746Courtesy of FORD MOTOR CO.
    • For the OSS, measure the voltage between C193-1, circuit LE111 (VT/GN), harness side and ground.
      • Fig 2: Checking For Sensor Battery Voltage - TSS/Intermediate Shaft Speed Sensor
      GF0044747Courtesy of FORD MOTOR CO.
    • For the TSS and intermediate shaft speed sensor, measure the voltage between C1387-1, circuit LE111 (VT/GN), harness side and ground.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  I5.
    2. NO  : Repair the open in circuit LE111 (VT/GN). CLEAR the DTCs. TEST the system for normal operation.
  5. I5 CHECK THE TRANSMISSION VEHICLE HARNESS CIRCUITS FOR AN OPEN 
    • Disconnect: TCM C1750
    • Disconnect: Transmission vehicle harness C1385
    • For TSS/intermediate shaft speed sensor, measure the resistance between the speed sensor C1387 and TCM C1750 using the following chart.
      TCM Circuit Component
      C1750-20 LE111 (VT/GN) C1387-1
      C1750-49 RET24 (BN/BU) C1387-2
      C1750-50 VET33 (WH/OG) C1387-3
      C1750-52 VE744 (GY/BN) C1387-4
      • Fig 3: Checking Transmission Vehicle Harness Circuits For An Open
      GF0049277Courtesy of FORD MOTOR CO.
    • For OSS, measure the resistance between OSS C193 and PCM C193 using the following chart.
      TCM Circuit Component
      C1750-20 LE111 (VT/GN) C193-1
      C1750-51 RET04 (YE/OG) C193-2
      C1750-49 RET24 (BN/BU) C193-3
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  I6.
    2. NO  : REPAIR the open circuit. CLEAR the DTCs. TEST the system for normal operation.
  6. I6 CHECK THE TRANSMISSION VEHICLE HARNESS CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between TSS/Intermediate Shaft Speed Sensor C1387, harness side and ground using the following chart.
      TSS/Intermediate Shaft Speed Sensor Circuit Ground
      C1387-1 LE111 (VT/GN) Ground
      C1387-2 RET24 (BN/BU) Ground
      C1387-3 VET33 (WH/OG) Ground
      C1387-4 VE744 (GY/BN) Ground
      • Fig 4: Checking Transmission Vehicle Harness Circuits For A Short To Ground
      GF0044749Courtesy of FORD MOTOR CO.
    • Measure the resistance between OSS C193, harness side and ground using the following chart.
      OSS Circuit Ground
      C193-1 LE111 (VT/GN) Ground
      C193-2 RET04 (YE/OG) Ground
      C193-3 RET24 (BN/BU) Ground
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  I7.
    2. NO  : REPAIR the shorted circuit. CLEAR the DTCs. TEST the system for normal operation.
  7. I7 CHECK THE RESISTANCE OF THE TSS, INTERMEDIATE SHAFT SPEED SENSOR OR OSS SENSOR 
      Fig 5: Measuring Resistance Of OSS C193-2 To C193-3
      GF0044750Courtesy of FORD MOTOR CO.
    • Measure the resistance of the OSS C193-2 to C193-3.
      • Fig 6: Measuring Resistance Of Intermediate Shaft Speed Sensor C1387-2 To C1387-4
      GF0044751Courtesy of FORD MOTOR CO.
    • Measure the resistance of the intermediate shaft speed sensor C1387-2 to C1387-4.
      • Fig 7: Measuring Resistance Of TSS C1387-2 To C1387-3
      GF0044752Courtesy of FORD MOTOR CO.
    • Measure the resistance of the TSS C1387-2 to C1387-3.
    • Record the resistance. Resistance should be as follows:
      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? 
    1. YES  : INSTALL a new TCM.
    2. NO  : INSTALL a new sensor. CLEAR the DTCs. TEST the system for normal operation.
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