CVT CONTROL SYSTEM:Primary Pressure Sensor

The Primary Pressure sensor is included in the transaxle assembly.
The Primary Pressure sensor detects Primary Pressure of CVT and sends a signal to the TCM.
When Pressure is applied to the ceramic device in the Primary Pressure sensor, the ceramic device is deformed, resulting in voltage change. TCM evaluates the Primary Pressure from its voltage change. Voltage is increased along with pressure increase.

Fig 1: Primary Pressure Sensor Circuit With Voltage And Oil Pressure Characteristics
Courtesy of NISSAN NORTH AMERICA, INC.