Vehicle Speed Signal, Checking: Function
WARNING: This page is about a different car, the 2015 Volkswagen Passat and 2014 Volkswagen Passat. However, it is still accessible from the selected car via links, so may be relevant.
The Vehicle Speed Signal or VSS measures Transmission / Transaxle output or Wheel Speed from the ABS System. The signal is broadcasted over the CAN Bus. The Engine Control Module -J623- uses this information to modify engine functions such as ignition timing, AF ratio, transmission shift points, and to initiate diagnostic routines.
Special tools and workshop equipment required
- Multimeter
- Wiring Diagram
- Scan Tool