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Pinpoint Test G: Output Shaft Speed (OSS) Sensor

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to OUTPUT SHAFT SPEED (OSS) SENSOR CONNECTOR  for output shaft speed sensor harness connector illustration.
  1. G1 ELECTRONIC DIAGNOSTICS 
    • Check that the output shaft speed (OSS) sensor connectors are fully seated, pins are engaged in connector and in good condition before proceeding.
    • Are the connectors OK? 

      Yes 

      GO to G2.

      No 

      REPAIR as necessary. CLEAR the DTCs. REPEAT the OBD Tests.

    2. Test Step 

  2. G2 CHECK THE CONTINUITY OF THE OSS HARNESS CIRCUITS 
    • Key in OFF position.
      • CAUTION: Do not pry on the connector. This will damage the connector and could result in a transaxle concern. Press the button and pull up on the connector.
    • Disconnect OSS.
    • Disconnect: PCM.
    • Install the EEC-V Control System Breakout Box and leave the PCM disconnected.
    • Measure the resistance between the PCM signal test pin 84 at the EEC-V Control System Breakout Box and the OSS(+) signal circuit at the OSS harness connector.
    Fig 1: Checking Continuity Of OSS Harness Circuits (1 Of 2)
    G03244478Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM signal test pin 91 at the EEC-V Control System Breakout Box and the OSS(-) signal circuit at the OSS harness connector.
      Fig 2: Checking Continuity Of OSS Harness Circuits (2 Of 2)
      G03244479Courtesy of FORD MOTOR CO.
    • Are resistances less than 5 ohms? 

      Yes 

      GO to G3.

      No 

      REPAIR the circuit(s) as necessary. CLEAR the DTCs. REPEAT the OBD Tests.

    3. Test Step 

  3. G3 CHECK THE OSS CIRCUITS FOR SHORT TO POWER AND GROUND 
    • Install the EEC-V Control System Breakout Box.
    • Measure the resistance between the PCM test pin 84 and test pin 71 at the EEC-V Control System Breakout Box.
      Fig 3: Checking OSS Circuits For Short To Power And Ground (1 Of 2)
      G03244480Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM test pins 84, 71, and 91, and test pins 24, 25, 51, 76, 77, 91 and 103 at the EEC-V Control System Breakout Box. and chassis ground.
    Fig 4: Checking OSS Circuits For Short To Power And Ground (2 Of 2)
    G03244481Courtesy of FORD MOTOR CO.
    • Is each resistance greater than 10,000 ohms? 

      Yes 

      GO to G4.

      No 

      REPAIR the circuit(s) as necessary. CLEAR the DTCs. REPEAT the OBD Tests.

  4. G4 TRANSMISSION FUNCTIONAL TEST 
    • Connect: PCM.
    • Using the OSS adapter connector connect the Transmission Tester to the OSS sensor.
    • With the voltmeter set to AC, measure the voltage with the positive lead to +TSS/OSS and the negative lead to -TSS/OSS.
      Fig 5: Transmission Functional Test
      G03244482Courtesy of FORD MOTOR CO.
    • Carry out the OSS Voltage Test under Dynamic Testing Engine ON; refer to the transmission tester manual. Monitor the voltmeter.
    • Does the voltage increase with an increase in vehicle speed? 

      Yes 

      INSTALL a new PCM. Refer to POWERTRAIN CONTROL MODULE (PCM) . REPEAT the OBD Tests.

      No 

      GO to G5.

  5. G5 CHECK THE RESISTANCE OF THE OSS SENSOR 
    NOTE: Refer to the Transmission Tester for pin locations.
    • Measure the resistance with the negative lead to -TSS/OSS jack and the positive lead to +TSS/OSS jack on the tester.
      Fig 6: Checking Resistance Of OSS Sensor
      G03244483Courtesy of FORD MOTOR CO.
    • Is the resistance between 235 and 735 ohms? 

      Yes 

      GO to G6.

      No 

      INSTALL a new OSS sensor. Refer to OUTPUT SHAFT SPEED (OSS) SENSOR . REPEAT the OSS Function Test.

  6. G6 CHECK THE SENSOR FOR SHORT TO GROUND 
    NOTE: Connection should show infinite resistance (no continuity).
    • Check for continuity between the BAT(-) jack (engine ground) and the TSS/OSS jacks as shown.
    Solenoid Tester Jack
    OSS +TSS/OSS
    -TSS/OSS
    Fig 7: Checking Sensor For Short To Ground
    G03244484Courtesy of FORD MOTOR CO.
    • Does the connection show continuity? 

      Yes 

      INSTALL a new OSS sensor. Refer to OUTPUT SHAFT SPEED (OSS) SENSOR . REPEAT the OSS Function Test.

      No 

      GO to G7.

  7. G7 CHECK THE OSS MAGNETISM 
    • Remove the OSS sensor. Refer to OUTPUT SHAFT SPEED (OSS) SENSOR .
    • Place the OSS sensor against a metal surface to which a magnet would stick. The OSS sensor should be magnetized and stick to the metal surface.
    • Does the OSS sensor stick? 

      Yes 

      CLEAR the DTCs. REPEAT the OSS Function Test.

      No 

      INSTALL a new OSS sensor. Refer to OUTPUT SHAFT SPEED (OSS) SENSOR . REPEAT the OSS Function Test.

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