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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 521 (Automatic Transmission - 6R80) >> Diagnosis And Testing >> Pinpoint Tests - OSC Equipped Vehicle >> Pinpoint Tests >> Pinpoint Test E : OSS Sensor >> Pinpoint Test E : OSS Sensor

Pinpoint Test E : OSS Sensor

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. E1 DRIVE CYCLE TEST

    • Using a diagnostic scan tool, 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? 

    Yes  REFER to Shift Point Road Test .
    No  GO to  E2.

  2. E2 CHECK OSS SENSOR SIGNAL CIRCUIT FOR POWER

    • Ignition OFF.
    • Disconnect: Transmission Vehicle Harness C1575 .
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-15
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage approximately 5 volts? 

    Yes  GO to  E3.
    No  GO to  E6.

  3. E3 CHECK THE OSS SENSOR SIGNAL CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Disconnect: PCM C175E .
    • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C175E-12
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C1575-15

    Is the resistance less than 3 ohms? 

    Yes  GO to  E4.
    No  INSPECT and REPAIR transmission vehicle harness OSS signal circuit for an open. If an open circuit is not found, INSTALL a new PCM, REFER to Electronic Engine Controls . PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy .

  4. E4 CHECK THE OSS SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-15
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  E5.
    No  INSPECT and REPAIR transmission vehicle harness OSS signal circuit for a short to ground. If a short to ground is not found, INSTALL a new PCM, REFER to Electronic Engine Controls . PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy .

  5. E5 CHECK THE OSS SENSOR SIGNAL CIRCUIT FOR A SHORT TO POWER

    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-15
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is voltage greater than 5.1 volts? 

    Yes  INSPECT and REPAIR transmission vehicle harness OSS signal circuit for a short to power. If a short to power is not found, INSTALL a new PCM, REFER to Electronic Engine Controls . PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy .
    No  GO to  E6.

  6. E6 CHECK THE OSS SENSOR GROUND CIRCUIT

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-15
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 C1575-5

    Is the voltage approximately 5 volts? 

    Yes  REPAIR the transmission vehicle harness signal return circuit for an open. If an open is not found, INSTALL a new PCM, REFER to Electronic Engine Controls . PROGRAM the PCM with the latest calibration level. PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy .
    No  INSTALL a new molded leadframe, REFER to Shift Solenoids (SS) . CLEAR the DTC s.
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