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.

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.

Fig 1: Scan Tool Display - Active test
Courtesy of NISSAN MOTOR CO., U.S.A.
Turn VIAS control solenoid valve "ON" and "OFF", and check vacuum existence under the following conditions.

Fig 2: Vacuum Applied Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

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