With CONSULT-II

WARNING: This page is about a different car, the 2004 Nissan Maxima. 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: CONSULT-II Active Test

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