Mazda RX-8 2004-06

Vehicle Speed Sensor

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Operation



The Vehicle Speed Sensor (VSS) is a magnetic pick-up that sends a signal to the Powertrain Control Module (PCM). The sensor measures the rotation of the transmission and the PCM determines the corresponding vehicle speed.

Removal & Installation



The VSS is located half-way down the right-hand side of the transmission assembly.

  1. Apply parking brake, block the rear wheels, then raise and safely support the front of the vehicle on jack stands.
  2.  
  3. From under the right-hand side of the vehicle, disengage the wiring harness connector from the VSS.
  4.  
  5. Loosen the VSS hold-down bolt, then pull the VSS out of the transmission housing.
  6.  

To install:

  1. If a new sensor is being installed, transfer the driven gear retainer and gear to the new sensor.
  2.  
  3. Ensure that the O-ring is properly seated in the VSS housing.
  4.  
  5. For ease of assembly, engage the wiring harness connector to the VSS, then insert the VSS into the transmission assembly.
  6.  
  7. Install and tighten the VSS hold-down bolt to 62-88 in lbs.
  8.  
  9. Lower the vehicle and remove the wheel blocks.
  10.  

Testing



  1. Remove the VSS
  2.  
  3. Using a low voltage voltmeter, measure the voltage between two terminals of the VSS while rotating the driven gear by hand. Voltmeter needle should move below 5 volts.
  4.  
  5. If the voltmeter needle moves, check wiring and/or connectors and repair/replace as necessary.
  6.  
  7. If the voltmeter needle does not move, replace the VSS.

    Click image to see an enlarged view

    Fig. VSS testing

  8.  

 
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