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

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 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 within the TRANSMISSION CONNECTOR LAYOUTS  procedure.
NOTE: Refer to the Internal Harness Connector illustration within the TRANSMISSION CONNECTOR LAYOUTS  procedure.
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.
    • Ignition OFF.
    • Check to make sure the transmission vehicle harness C1385, Output Shaft Speed (OSS) C193, Turbine Shaft Speed (TSS)/intermediate shaft speed sensor C1387 and C1750 are fully seated, terminals are fully engaged in the connector and are in good condition before proceeding.
    • Connect the scan tool.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: PID List.
    • Select and monitor the appropriate PID for the suspected sensor(s): TSS  , intermediate shaft speed sensor or OSS  sensor.
      PID DESCRIPTION CHART

      PID Description Value
      ISS_SRC Raw intermediate shaft speed signal RPM
      OSS_SRC Raw OSS  signal RPM
      TSS_SRC Raw TSS  signal RPM
    • Can the appropriate sensor(s) be selected and monitored? 
  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? 
    • Yes:  GO to I3  .
    • 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)? 
    • Yes:  If the sensor signal is erratic, there may be an intermittent concern in the vehicle harness sensor or connector. GO to I4  .
    • No:  CLEAR the DTCs. RERUN On-Board Diagnostic (OBD) test.
  4. I4 CHECK FOR SENSOR BATTERY VOLTAGE 
    • Ignition OFF.
    • Disconnect: OSS  Sensor C193.
    • Disconnect: TSS  /intermediate Shaft Speed Sensor C1387.
    • Inspect for damaged or pushed-out terminals, corrosion or loose wires.
    • Ignition ON.
    • For the OSS  , measure the voltage between C193-1, circuit LE111 (VT/GN), harness side and ground.
      Fig 1: Measuring Voltage Between C193-1, Circuit LE111 (VT/GN), Harness Side And Ground
      G06140580Courtesy of FORD MOTOR CO.
    • For the TSS  /intermediate shaft speed sensor, measure the voltage between C1387-1, circuit LE111 (VT/GN), harness side and ground.
      Fig 2: Measuring Voltage Between C1387-1, Circuit LE111 (VT/GN), Harness Side And Ground
      G06599413Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  GO to I5  .
    • 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: Transmission Control Module (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.
      RESISTANCE REFERENCE

      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
    • For OSS  , measure the resistance between OSS  C193 and TCM  C1750 using the following chart.
      RESISTANCE REFERENCE

      TCM  Circuit Component
      C1750-20 LE111 (VT/GN) C193-1
      C1750-51 RET04 (YE/OG) C193-2
      C1750-49 RET24 (BN/BU) C193-3
      Fig 3: Measuring Resistance Between C193 And C1750
      G06775668Courtesy of FORD MOTOR CO.
    • Is resistance less than 5 ohms? 
    • Yes:  GO to I6  .
    • 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.
      RESISTANCE REFERENCE

      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
    • Measure the resistance between OSS  C193, harness side and ground using the following chart.
      RESISTANCE REFERENCE

      OSS  Circuit Ground
      C193-1 LE111 (VT/GN) Ground
      C193-2 RET04 (YE/OG) Ground
      C193-3 RET24 (BN/BU) Ground
      Fig 4: Measuring Resistance Between Harness Side And Ground
      G06599416Courtesy of FORD MOTOR CO.
    • Is resistance greater than 10,000 ohms? 
    • Yes:  If DTC P0715, P0717, P0718, P0719, P0793 and/or P0794 were set, REPLACE the TSS  /intermediate shaft speed sensor. If DTC P0720, P0721 and/or P0722 were set, REPLACE the OSS  sensor. CLEAR the DTCs. TEST the system for normal operation.
    • No:  INSPECT and REPAIR the circuit shorted to ground. If a short to ground was not found, REPLACE the TCM. TEST the system for normal operation.
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