Vehicle Speed Signal, Checking: General Description

The Vehicle Speed Signal or VSS measures Transmission / Transaxle output or Wheel Speed from the ABS. The signal is broadcasted over the CAN Bus. The Engine/Motor Control Module -J623- uses this information to modify engine functions such as ignition timing, A/F ratio, transmission shift points, and to initiate diagnostic routines.

Special tools and workshop equipment required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.