Without 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.
Disconnect VIAS control solenoid valve harness connector.
Start engine and let it idle.
Apply 12V of direct current between VIAS control solenoid valve terminals 1 and 2.

Fig 1: Manually Checking Vacuum Existence
Courtesy of NISSAN MOTOR CO., U.S.A.
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.