Vehicle Speed Sensor
WARNING: This page is about a different car, the 2002 Mazda 626 and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
Vehicle Speed Sensor (VSS) is a magnetic pickup that sends output speed signal to the PCM. Malfunction of sensor may cause harsh engagements of shifts, no 4th gear application, TCC lock-up, or engine braking in 2nd or 3rd gear.