Caliber 2007

Vehicle Speed Sensor

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Operation



The Vehicle Speed Sensor (VSS) is a Hall Effect sensor mounted above the transaxle differential. The sensor is triggered by the ring gear teeth passing below it. The VSS pulse signal to the speedometer/odometer is monitored by the PCM speed control circuitry to determine vehicle speed and to maintain speed control set speed.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air intake assembly.
  4.  
  5. Disconnect the Vehicle Speed Sensor (VSS) electrical connector.
    NOTE
    Clean the area around the VSS before removal to prevent dirt from the entering the transaxle.

  6.  
  7. Remove the VSS retaining bolt and remove the VSS.
  8.  

To install:

  1. Install the VSS using a new O-ring. Tighten the retaining bolt to 60 inch lbs. (7 Nm).
  2.  
  3. Connect the VSS electrical connector.
  4.  
  5. Install the air intake assembly.
  6.  
  7. Connect the negative battery cable.
  8.  

Testing



  1. Using a diagnostic scan tool, check for the presence of any Diagnostic Trouble Codes (DTCs). Record and address these codes as necessary.
  2.  
  3. If no codes are present, review the scan tool environmental data. If possible, try to duplicate the conditions under which the DTC set.
  4.  
  5. If applicable, actuate the component with the scan tool.
  6.  
  7. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
  8.  
  9. Look for the data to change, the actuation to be interrupted, or for the DTC to reset during the wiggle test.
  10.  
  11. Refer to any Technical Service Bulletins (TSBs) that may apply.
  12.  
  13. Turn the ignition off.
  14.  
  15. Visually inspect the related wire harness. Disconnect all the related harness connectors. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out, or corroded terminals.
  16.  
  17. Perform a voltage drop test on the related circuits between the suspected component and the Powertrain Control Module (PCM).
  18.  
  19. Inspect and clean all PCM, engine, and chassis grounds that are related to the most current DTC.
  20.  
  21. If numerous trouble codes were set, use a schematic and inspect any common ground or supply circuits.
  22.  
  23. For intermittent Misfire DTCs check for restrictions in the Intake and Exhaust system, proper installation of Sensors, vacuum leaks, and binding components that are run by the accessory drive belt.
  24.  
  25. Use the scan tool to perform a System Test if one applies to the component.
  26.  
  27. A co-pilot, data recorder, and/or lab scope should be used to help diagnose intermittent conditions.
  28.  

 
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