Solstice 2006-2008, Sky 2007-2008

Vehicle Speed Sensor

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NOTE
The Vehicle Speed Sensor (VSS) is also known as the Output Shaft Speed (OSS) sensor.

Operation



The Vehicle Speed Sensor or Output Shaft Speed Sensor (VSS)/(OSS) is a magnetic inductive pickup that relays vehicle speed information to the Transmission Control Module (TCM). The TCM uses this information in order to control shift timing, line pressure, and TCC apply and release.

The VSS mounts in the case extension at the vehicle speed sensor reluctor wheel, which is pressed onto the final drive carrier assembly. An air gap of 0.011-0.062 inch. (0.27-1.57 mm) occurs between the sensor and the teeth on the vehicle speed sensor reluctor wheel as the final drive carrier assembly rotates.

The sensor consists of a permanent magnet surrounded by a coil of wire. As the vehicle speed sensor reluctor wheel on the final drive carrier assembly rotates, an AC signal is produced by the VSS. This AC signal consists of a voltage and frequency that changes based on vehicle speed. The TCM uses the frequency portion of this signal to determine vehicle speed. Higher vehicle speeds induce a higher frequency and a higher voltage measurement at the sensor. The voltage portion of the signal is used in diagnostic procedures.

Removal & Installation



Automatic Transmission 5l40-E/5l50-E Output Speed Sensor (OSS)
  1. Raise and support the vehicle.
  2.  
  3. Remove the floor panel tunnel.
  4.  
  5. Drain the transmission fluid.
  6.  
  7. Remove the transmission fluid pan and filter.
  8.  
  9. Disconnect the electrical wiring harness connector from the output speed sensor.
  10.  
  11. Remove the output speed sensor bolt.
  12.  
  13. Remove the output speed sensor.
  14.  
  15. Remove the output speed sensor spacer.
  16.  
  17. Inspect the output speed sensor for the following conditions:
    1. Damaged or missing magnet
    2.  
    3. Damaged housing
    4.  
    5. Bent or missing electrical terminals

      Click image to see an enlarged view

      Fig. Output Speed Sensor (OSS)

    6.  

  18.  

To install:

  1. Install the output speed sensor spacer.
  2.  
  3. Install the output speed sensor. 
  4.  
  5. Install the output speed sensor mounting bolt and tighten to 97 inch. lbs. (11 Nm).
  6.  
  7. Connect the electrical wiring harness connector to the output speed sensor.
  8.  
  9. Install the transmission fluid pan and filter.
  10.  
  11. Tighten the transmission pan bolts to 97 inch. lbs. (11 Nm).
  12.  
  13. Add DEXRON®VI automatic transmission fluid in increments of 0.5 L (0.5 qt) until the fluid drains from the hole plug.

    Click image to see an enlarged view

    Fig. Transmission fluid check plug location

  14.  
  15. Install the floor panel tunnel.
  16.  
  17. Lower vehicle.
  18.  
  19. Recheck fluid level if needed.
  20.  

Manual Transmission
Aisin Ar5 Vehicle Speed Sensor (VSS) Electrical Connector
  1. Raise and support the vehicle.
  2.  
  3. Remove the front floor closeout panel.
  4.  
  5. Disconnect the Vehicle Speed Sensor (VSS) electrical connector.
  6.  
  7. Remove the VSS bolt.
  8.  
  9. Remove the VSS.
  10.  
  11. Remove the O-ring seal from the VSS.
  12.  

To install:

  1. Install the O-ring seal to the VSS.
  2.  
  3. Install the VSS to the transmission.
  4.  
  5. Install the VSS mounting bolt and tighten to 13 ft. lbs. (17 Nm).
  6.  
  7. Connect the VSS electrical connector.
  8.  
  9. Install the front floor closeout panel.
  10.  
  11. Lower the vehicle.
  12.  

Testing



  1. Disconnect Vehicle Speed Sensor or Output Speed Sensor (VSS)/(OSS) electrical connector from sensor.
  2.  
  3. With a digital mutimeter check resistance between pin A VSS/OSS low signal and pin B VSS/OSS high signal.
  4.  
  5. Sensor resistance should measure between 1,650-2,200 ohms at 20°C 68°F.
  6.  
  7. If resistance reading is not as stated suspect faulty VSS/OSS sensor.
  8.  
  9. With a digital mutimeter check voltage between pin A VSS low signal and pin B VSS/OSS high signal.
  10.  
  11. Safely lift wheels off of the ground and run in gear to check voltage readings.
  12.  
  13. Check for output voltage this will vary with vehicle speed from a minimum of 0.5 volts AC at 100 RPM to 200 volts at 6,000 RPM.
  14.  
  15. If no voltage reading is present suspect internal transmission problem or faulty VSS/OSS sensor.

    Click image to see an enlarged view

    Fig. Automatic transmission 5L40-E/5L50-E Output Speed Sensor (OSS) electrical connector



    Click image to see an enlarged view

    Fig. Manual transmission Aisin -AR5 Vehicle Speed Sensor (VSS) electrical connector

  16.  

 
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