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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Automatic Transmission - 6R140 (TORQSHIFT-R-6)) >> Diagnosis & Testing >> Pinpoint Tests >> Pinpoint Tests - PCM >> Pinpoint Test E: OSS Sensor

Pinpoint Test E: OSS Sensor

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If the scan tool is unable to access the transmission PIDs, REFER to the INTRODUCTION - DIESEL MODELS or ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) (SECTION 0) .
NOTE: If DTCs P0706, P0707, P0708, P1702 and/or P1921 are set, diagnose those DTCs first.
NOTE: Read and record all DTCs.
  1. E1 DRIVE CYCLE TEST 
    • Enter the following diagnostic mode on the scan tool: OSS PID: OSS_SRC.
    • Monitor the Output Shaft Speed (OSS) sensor PID while road testing the vehicle. Drive the vehicle so the transmission upshifts and downshifts through all the gears.
    • Does the OSS sensor rpm increase and decrease with engine rpm and vehicle speed? 
  2. E2 CHECK THE OSS SIGNAL CIRCUIT FOR AN OPEN 
    • Disconnect: Transmission C1623.
    • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
    • Disconnect: PCM C175T.
    • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
    • Measure the resistance between the transmission vehicle harness C1623-17 circuit RET04 (YE/OG) and the PCM C175T-14.
      Fig 1: Measuring Resistance Between Transmission Vehicle Harness C1623-17 Circuit RET04 (YE/OG) And PCM C175T-14
      G07482741Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to E3.
    • No  : REPAIR the OSS signal circuit RET04 (YE/OG) for an open. CLEAR the DTCs. TEST the system for normal operation.
  3. E3 CHECK THE OSS SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between the PCM C175T-14 circuit RET04 (YE/OG) and ground.
      Fig 2: Measuring Resistance Between PCM C175T-14 Circuit RET04 (YE/OG) And Ground
      G07482742Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to E4.
    • No  : REPAIR the OSS signal circuit RET04 (YE/OG) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.
  4. E4 CHECK THE OSS SIGNAL CIRCUIT FOR A SHORT TO POWER 
    • Ignition ON.
    • Check for voltage between the PCM C175T-14 circuit RET04 (YE/OG) and ground.
      Fig 3: Checking Voltage Between PCM C175T-14 Circuit RET04 (YE/OG) And Ground
      G07482743Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the OSS signal circuit RET04 (YE/OG) for a short to voltage. CLEAR the DTCs. TEST the system for normal operation.
    • No  : GO to E5.
  5. E5 CHECK THE OSS SIGNAL CIRCUIT FOR POWER 
    • Ignition OFF.
    • Connect: PCM C175T.
    • Ignition ON.
    • Check for voltage between the transmission vehicle harness C1623-17 circuit RET04 (YE/OG) and ground.
      Fig 4: Checking Voltage Between Transmission Vehicle Harness C1623-17 Circuit RET04 (YE/OG) And Ground
      G07482744Courtesy of FORD MOTOR CO.
    • Is voltage greater than 4.6 volts? 
    • Yes  : GO to E6.
    • No  : REPLACE the PCM. PROGRAM the PCM with the latest calibration level. PERFORM the solenoid strategy download procedure. REFER to SOLENOID BODY STRATEGY . TEST the system for normal operation.
  6. E6 CHECK THE OSS INTERNAL HARNESS FOR AN OPEN 
    • Remove the transmission fluid pan.
    • Disconnect: 3-way OSS sensor connector.
    • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
    • Measure the resistance of the OSS sensor circuits between C1623 and the 3-way OSS sensor connector component side, using the following chart.
      Transmission OSS Sensor Circuit Terminal
      C1623-12 OSS Power 1
      C1623-17 OSS Signal 2
      C1623-10 OSS Ground 3
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to E7.
    • No  : REPLACE the transmission internal harness. CLEAR the DTCs. TEST the system for normal operation.
  7. E7 CHECK THE OSS INTERNAL HARNESS FOR A SHORT TO GROUND 
    • Measure the resistance of the OSS sensor circuits between C1623 and ground using the following chart.
      Transmission OSS Sensor Circuit Ground
      C1623-12 OSS Power Ground
      C1623-17 OSS Signal Ground
      C1623-10 OSS Ground Ground
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : REPLACE the OSS sensor.
    • No  : REPLACE the transmission internal harness. CLEAR the DTCs. TEST the system for normal operation. If DTCs P0720, P0721 and/or P0722 return, REPLACE the PCM. PROGRAM the PCM with the latest calibration level. PERFORM the solenoid strategy download procedure. REFER to SOLENOID BODY STRATEGY . TEST the system for normal operation.
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