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 REFERENCE CHART
   
   

   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, 000 RPM.
5. Check vacuum existence under the following conditions.
   VACUUM CONDITION CHART
   
   

   Condition	Vacuum
   Idle	Existed
   Rev engine quickly up to approximately 5, 000 RPM	Not existed

   Is the inspection result normal? 

   YES: Repair or replace power valve actuator 1. Refer to "ENGINE CONTROL SYSTEM : 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 "EXPLODED VIEW ".

1. Stop engine.
2. Check vacuum hose for crack, clogging, improper connection or disconnection. Refer to "VARIABLE INDUCTION AIR SYSTEM : SYSTEM DESCRIPTION ".

   Is the inspection result normal? 

   YES: GO TO 5.

   NO: Repair hoses or tubes.

   Fig 1: Checking Hoses And Tubes

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

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 "EXPLODED VIEW ".

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 REFERENCE CHART
   
   

   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, 000 RPM.
5. Check vacuum existence under the following conditions.
   VACUUM EXISTENCE CONDITION CHART
   
   

   Condition	Operation
   Idle	Existed
   Rev engine quickly up to approximately 5, 000 RPM	Not existed

   Is the inspection result normal? 

   YES: Repair or replace power valve actuator 2. Refer to "ENGINE CONTROL SYSTEM : COMPONENT PARTS LOCATION ".

   NO: GO TO 7.

1. Stop engine.
2. Check vacuum hose for crack, clogging, improper connection or disconnection. Refer to "VARIABLE INDUCTION AIR SYSTEM : SYSTEM DESCRIPTION ".

   Is the inspection result normal? 

   YES: GO TO 8.

   NO: Repair hoses or tubes.

   Fig 2: Checking Hoses And Tubes

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

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 "EXPLODED VIEW ".