With CONSULT-II

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

Start engine and warm it up to normal operating temperature.
Perform "VIAS SOL VALVE" in "ACTIVE TEST" mode with CONSULT-II.
Turn VIAS control solenoid valve "ON" and "OFF", and make sure that power valve actuator rod moves.

Fig 1: Scan Tool Display - Active Test

Courtesy of NISSAN MOTOR CO., U.S.A.