G6 2005-2007

Vehicle Speed Sensor

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Operation



The Vehicle Speed Sensor (VSS) is a magnetic inductive pickup that relays vehicle speed information to the 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



4T45-E
  1. Position the vehicle on a hoist and raise the vehicle.
  2.  
  3. Disconnect the Vehicle Speed Sensor (VSS) electrical connector.
  4.  
  5. Remove the VSS electrical harness retainer from the VSS stud.
  6.  
  7. Remove the VSS stud.
  8.  
  9. Remove the output VSS from the transmission case.
  10.  
  11. Remove the O-ring from the VSS.
  12.  

To Install:

  1. Install the O-ring onto the VSS.
  2.  
  3. Install the output VSS into the transmission case.
  4.  
  5. Install the VSS stud and tighten to 8 ft. lbs. (11 Nm).
  6.  
  7. Install the VSS electrical harness retainer to the VSS stud.
  8.  
  9. Connect the VSS electrical connector.
  10.  
  11. Lower the vehicle.
  12.  

4T65-E
  1. Raise and support the vehicle.
  2.  
  3. Remove the right front tire and wheel.
  4.  
  5. Disconnect the Vehicle Speed Sensor (VSS) electrical connector.
  6.  
  7. Remove the VSS bolt.
  8.  
  9. Remove the VSS from the extension case.
  10.  
  11. Remove the O-ring from the VSS.
  12.  

To Install:

  1. Install the O-ring to the VSS  
  2.  
  3. Install the VSS.
  4.  
  5. Install the VSS bolt and tighten to 106 inch. lbs. (12 Nm).
  6.  
  7. Connect the VSS electrical connector.
  8.  
  9. Install the right front tire and wheel.
  10.  
  11. Lower the vehicle.
  12.  

6T70-6T75
  1. Raise and support the vehicle.
  2.  
  3. Remove the control valve body cover.
  4.  
  5. Disconnect the Output Speed Sensor (OSS) electrical connector.
  6.  
  7. Remove output shaft speed sensor.
  8.  

To Install:

  1. Install OSS sensor.
  2.  
  3. Reconnect the Output Speed Sensor (OSS) electrical connector.
  4.  
  5. Install the control valve body cover.
  6.  
  7. Lower the vehicle.
  8.  
  9. Check transmission fluid level and add as needed.
  10.  

Manual Transmission
F40
  1. Remove the air cleaner outlet duct.
  2.  
  3. Disconnect the vehicle speed sensor electrical connector.
  4.  
  5. Remove the VSS bolt.
  6.  
  7. Remove the VSS from the case.
  8.  
  9. Remove the O-ring from the VSS.
  10.  

To Install:

  1. Install the O-ring to the VSS  
  2.  
  3. Install the VSS.
  4.  
  5. Install the VSS bolt and tighten to 13 inch. lbs. (18 Nm).
  6.  
  7. Connect the VSS electrical connector.
  8.  

Testing





Click image to see an enlarged view

Fig. Vehicle Speed Sensor (VSS/OSS)

  1. Disconnect Vehicle Speed Sensor (VSS) electrical connector from sensor.
  2.  
  3. With a digital mutimeter check resistance between pin A VSS low signal and pin B VSS 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 sensor.
  8.  
  9. With a digital mutimeter check voltage between pin A VSS low signal and pin B VSS 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 sensor.
  16.  

 
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