CVT CONTROL SYSTEM: Primary Speed Sensor

The primary speed sensor is included in the control valve assembly.
The primary speed sensor detects the primary pulley revolution speed and sends a signal to the TCM.
The primary speed sensor generates an ON-OFF pulse signal according to the rotating body speed. TCM judges the rotating body speed from the pulse signal.

Fig 1: Primary Speed Sensor Voltage Signal Waveform
Courtesy of NISSAN NORTH AMERICA, INC.