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 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. When revving engine up to 5, 000 RPM quickly.
5. Check vacuum existence under the following conditions.

   Condition	Operation
   Idle	Existed
   When revving engine up to 5, 000 RPM quickly	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 "REMOVAL AND INSTALLATION ".

1. Stop engine.
2. Check vacuum hose for cracks, clogging, improper connection or disconnection. Refer to "SYSTEM DESCRIPTION ".
   Fig 1: Checking Vacuum Hose For Cracks, Clogging And Improper Connection

   Courtesy of NISSAN NORTH AMERICA, INC.

   Is the inspection result normal? 

   YES: GO TO 5.

   NO: Repair hoses or tubes.

Refer to "COMPONENT INSPECTION ".

Is the inspection result normal? 

YES: GO TO  9.

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 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. When revving engine up to 5, 000 RPM quickly.
5. Check vacuum existence under the following conditions.

   Condition	Operation
   Idle	Existed
   When revving engine up to 5, 000 RPM quickly	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 cracks, clogging, improper connection or disconnection. Refer to "SYSTEM DESCRIPTION ".
   Fig 2: Checking Vacuum Hose For Cracks, Clogging And Improper Connection

   Courtesy of NISSAN NORTH AMERICA, INC.

   Is the inspection result normal? 

   YES: GO TO 8.

   NO: Repair hoses or tubes.

Refer to "COMPONENT INSPECTION ".

Is the inspection result normal? 

YES: GO TO 9.

NO: Replace VIAS control solenoid valve 2. Refer to "COMPONENT PARTS LOCATION ".

Refer to "INTERMITTENT INCIDENT ".

: INSPECTION END