4. Check Vacuum Hose

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.
Check hoses and tubes between intake manifold and power valve actuator for crack, clogging, improper connection or disconnection. Refer to VACUUM HOSE DRAWING . .

OK or NG

OK: GO TO 5.
NG: Repair hoses or tubes.

Fig 1: Checking Vacuum Hoses For Damage Or Blockage

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