Audi Cars 1999-05

Vehicle Speed Sensor 2

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Testing



  1. Disconnect the 3-pin harness connector to the Vehicle Speed Sensor (VSS) (arrow).

    Click image to see an enlarged view

    Fig. Disconnect 3-pin harness connector to Vehicle Speed Sensor (VSS) (arrow)

  2.  
  3. Check harness connector for contact corrosion and ingress of water.
  4.  
  5. If the harness connector is not okay, repair the malfunction.
  6.  
  7. If the harness connector is okay, measure the resistance at the 3-pin connector of the Vehicle Speed Sensor (VSS).

    Click image to see an enlarged view

    Fig. Measure sensor resistance between terminals 1 and 2 at connector to sensor.

  8.  
  9. Measure the sensor resistance between terminals 1 and 2 at the connector to the sensor.
  10.  
  11. Specified value: 800 to 900 ohms
  12.  
  13. Check the sensor for short circuit between terminals 2 and 3 and 1 and 3.
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the specified values are not obtained, replace the Vehicle Speed Sensor (VSS).
  18.  
  19. If no malfunction is found on the sensor, check the wires to Transmission Control Module (TCM).
  20.  
  21. To check the wires to the Transmission Control Module (TCM), connect the test box to the control module wiring harness.

    Click image to see an enlarged view

    Fig. Check wires between test box and 3-pin connector to Transmission Control Module (TCM) for open circuit

  22.  
  23. Check the wires between the test box and the 3-pin connector to the Transmission Control Module (TCM) for open circuit.

    Terminal 1 and socket 65
     
    Terminal 2 and socket 20
     
    Terminal 3 and socket 43
     

  24.  
  25. Wire resistance: max. 1.5 ohms
  26.  
  27. Check the wires for short circuit to each other, to vehicle Ground (GND) and to Band.
  28.  
  29. Specified value: infinite ohms
  30.  
  31. If no malfunctions are found in the wires, replace the Transmission Control Module (TCM).
  32.  

  1. Disconnect the 3-pin harness connector to the Vehicle Speed Sensor (VSS) (arrow).

    Click image to see an enlarged view

    Fig. Disconnect 3-pin harness connector to Vehicle Speed Sensor (VSS) (arrow)

  2.  
  3. Check harness connector for contact corrosion and ingress of water.
  4.  
  5. If the harness connector is not okay, repair the malfunction.
  6.  
  7. If the harness connector is okay, measure the resistance at the 3-pin connector of the Vehicle Speed Sensor (VSS).

    Click image to see an enlarged view

    Fig. Measure sensor resistance between terminals 1 and 2 at connector to sensor.

  8.  
  9. Measure the sensor resistance between terminals 1 and 2 at the connector to the sensor.
  10.  
  11. Specified value: 800 to 900 ohms
  12.  
  13. Check the sensor for short circuit between terminals 2 and 3 and 1 and 3.
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the specified values are not obtained, replace the Vehicle Speed Sensor (VSS).
  18.  
  19. If no malfunction is found on the sensor, check the wires to Transmission Control Module (TCM).
  20.  
  21. To check the wires to the Transmission Control Module (TCM), connect the test box to the control module wiring harness.

    Click image to see an enlarged view

    Fig. Check wires between test box and 3-pin connector to Transmission Control Module (TCM) for open circuit

  22.  
  23. Check the wires between the test box and the 3-pin connector to the Transmission Control Module (TCM) for open circuit.

    Terminal 1 and socket 65
     
    Terminal 2 and socket 20
     
    Terminal 3 and socket 43
     

  24.  
  25. Wire resistance: max. 1.5 ohms
  26.  
  27. Check the wires for short circuit to each other, to vehicle Ground (GND) and to Band.
  28.  
  29. Specified value: infinite ohms
  30.  
  31. If no malfunctions are found in the wires, replace the Transmission Control Module (TCM).
  32.  

 
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