Diagnosis Procedure

Confirm the malfunctioning system (power valve 1 or power valve 2). Refer to Component Function Check .

Which system is related to the incident?

Power valve 1

GO TO 2.

Power valve 2

GO TO 6.

With CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator 1.
2. Start engine and let it idle.
3. Perform "VIAS S/V-1" in "Active Test" mode of "ENGINE" with CONSULT.
4. Turn VIAS control solenoid valve 1 ON and OFF, and check vacuum existence under the following conditions.

   VIAS S/V-1	Vacuum
   ON	Existed
   OFF	Not existed

Without CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator 1.
2. Disconnect VIAS control solenoid valve 1 harness connector.
3. Start engine.
4. Rev engine quickly up to approximately 5, 00 rpm.
5. Check vacuum existence under the following conditions.

   Condition	Vacuum
   Idle	Existed
   Rev engine quickly up to approximately 5, 00 rpm	Not existed

Is the inspection result normal?

YES

Repair or replace power valve actuator 1. Refer to Component Parts Location .

NO

GO TO 3.

1. Stop engine and disconnect vacuum hose connected to intake manifold collector.
2. Start engine and let it idle.
3. Check vacuum existence from intake manifold collector.

Does vacuum existence from the intake manifold collector?

YES

GO TO 4.

NO

Replace intake manifold collector. Refer to INTAKE MANIFOLD COLLECTOR .

1. Stop engine.
2. Check vacuum hose for crack, clogging, improper connection or disconnection. Refer to System Description .

   Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES

GO TO 5.

NO

Repair hoses or tubes.

Check VIAS control solenoid valve 1. Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 8.

NO

Replace VIAS control solenoid valve 1. Refer to Component Parts Location .

With CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator 2.
2. Start engine and let it idle.
3. Perform "VIAS S/V-2" in "Active Test" mode of "ENGINE" with CONSULT.
4. Turn VIAS control solenoid valve 2 ON and OFF, and check vacuum existence under the following conditions.

   VIAS S/V 2	Vacuum
   ON	Existed
   OFF	Not existed

Without CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator 2.
2. Disconnect VIAS control solenoid valve 1 harness connector.
3. Start engine.
4. Rev engine quickly up to approximately 5, 00 rpm.
5. Check vacuum existence under the following conditions.

   Condition	Operation
   Idle	Existed
   Rev engine quickly up to approximately 5, 00 rpm	Not existed

Is the inspection result normal?

YES

Repair or replace power valve actuator 2. Refer to Component Parts Location .

NO

GO TO 7.

1. Stop engine.
2. Check vacuum hose for crack, clogging, improper connection or disconnection. Refer to System Description .

   Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES

GO TO 8.

NO

Repair hoses or tubes.

Check VIAS control solenoid valve 2. Refer to Component Inspection .

Is the inspection result normal?

YES

Check intermittent incident. Refer to Intermittent Incident .

NO

Replace VIAS control solenoid valve 2. Refer to Component Parts Location .