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.

Stop engine and disconnect vacuum hose connected to power valve actuator.
Start engine and let it idle.
Perform "VIAS SOL VALVE" in "ACTIVE TEST" mode with CONSULT-II.
Turn VIAS control solenoid valve ON and OFF, and check vacuum existence under the following conditions.

Fig 1: CONSULT-II Active Test

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

Fig 2: Test Specifications

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

OK or NG

OK : Repair or replace power valve actuator.
NG : GO TO 4.