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Home >> Ford >> 2018 >> Mustang EcoBoost, 2D Convertible, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Pinpoint Test DN: Pressure And Temperature Sensors Through Pinpoint Test FD: Brake Pedal Inputs - (Except Diesel & Hybrid) >> Pinpoint Test DP: Output Shaft Speed (OSS) Sensor/Vehicle Speed Sensor (VSS) >> Test Procedure
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Test Procedure

  1. DP1 CHECK FOR DTCS 
    NOTE: For vehicles with automatic transmission and OSS sensor DTCs, refer to the appropriate Automatic Transmission article, Diagnostic Trouble Code (DTC) Charts.

    Are DTCs P0500, P0503, P0720, P0721, P0722, P0723, P1500, P1502, P1900, P1934 or P193F present? 

    Yes No
    GO to  DP2. RETURN to SYMPTOM CHARTS for further direction.
  2. DP2 VERIFY THE DRIVE CYCLE 
    • Access the PCM and monitor the OSS_SRC (RPM) PID.
    • Access the PCM and monitor the VSS (SPD) PID.
    • Drive the vehicle.
    • Monitor both of the PIDs in all transmission gear ranges while increasing and decreasing the speed.

    Do both PID readings increase and decrease with engine and vehicle speed? 

    Yes No
    GO to  DP3. GO to  DP4.
  3. DP3 VISUAL INSPECTION 
    • OSS Sensor connector disconnected.
    • Inspect the OSS sensor harness for damage.
    • Inspect the OSS harness connector for damage and correct seating.
    • Carry out a thorough wiggle test on the OSS harness.

    Is a concern present? 

    Yes No
    REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to PINPOINT TEST Z .
  4. DP4 CHECK VOLTAGE TO THE OSS SENSOR 
    • Ignition OFF.
    • OSS Sensor connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) OSS Sensor Connector, Harness Side (-) Vehicle Battery
      VBPWR - Pin 1 Negative terminal

    Is the voltage greater than 10.5 V? 

    Yes No
    GO to  DP5. REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  5. DP5 CHECK THE OSS CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • PCM connector disconnected.
    • OSS Sensor connector disconnected.
    • Measure the resistance between:
      (+) PCM Connector, Harness Side (-) OSS Sensor Connector, Harness Side
      OSS OSS - Pin 2
      SIGRTN SIGRTN - Pin 3

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  DP6. REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  6. DP6 CHECK THE OSS CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between:
      (+) OSS Sensor Connector, Harness Side (-)
      OSS - Pin 2 Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  DP7. REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  7. DP7 CHECK THE OSS CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • OSS Sensor connector disconnected.
    • Measure the voltage between:
      (+) OSS Sensor Connector, Harness Side (-) Vehicle Battery
      OSS - Pin 2 Negative terminal

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.    		 REMOVE the OSS sensor and INSPECT the target wheel. REPAIR as necessary. If OK, INSTALL a new OSS. REFER to the appropriate Manual Transmission article.
    Clear the PCM DTCs. REPEAT the self-test.
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