Diagnosis Procedure

With CONSULT-III 

1. Start engine and warm it up to normal operating temperature.
2. Perform "VIAS SOL VALVE" in "ACTIVE TEST" mode with CONSULT-III.
3. Turn VIAS control solenoid valve "ON" and "OFF", and make sure that power valve actuator rod moves.
   Fig 1: Moving Power Valve Actuator

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

Without CONSULT-III 

1. Start engine and warm it up to normal operating temperature.
2. Rev engine up to between 2, 200 and 3, 300 RPM and make sure that power valve actuator rod moves.

   OK or NG 

   OK: INSPECTION END 

   NG (With CONSULT-III): Go to 2.

   NG (Without CONSULT-III): Go to  3.

   Fig 2: Moving Power Valve Actuator

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

With CONSULT-III 

1. Stop engine and disconnect vacuum hose connected to power valve actuator.
2. Start engine and let it idle.
3. Perform "VIAS SOL VALVE" in "ACTIVE TEST" mode with CONSULT-III.
4. Turn VIAS control solenoid valve "ON" and "OFF", and check vacuum existence under the following conditions.
   VIAS SOL VALVE REFERENCE CHART
   
   

   VIAS SOL VALVE	Vacuum
   ON	Should exist.
   OFF	Should not exist.

   OK or NG 

   OK: Repair or replace power valve actuator.

   NG: Go to  4.

Without CONSULT-III 

1. Stop engine and disconnect vacuum hose connected to power valve actuator.
2. Disconnect VIAS control solenoid valve harness connector.
3. Start engine and let it idle.
4. Apply 12V of direct current between VIAS control solenoid valve terminals 1 and 2.
5. Check vacuum existence under the following conditions.
   VACUUM REFERENCE CHART
   
   

   Condition	Vacuum
   12V direct current supply	Should exist.
   No supply	Should not exist.

   Fig 3: Applying 12V Of Direct Current Between VIAS Control Solenoid Valve Terminals

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

   OK or NG 

   OK: Repair or replace power valve actuator.

   NG: Go to 4.

1. Stop engine.
2. Check hoses and tubes between intake manifold and power valve actuator for cracks, clogging, improper connection or disconnection. Refer to "VACUUM HOSE DRAWING ".

   OK or NG 

   OK: Go to 5.

   NG: Repair hoses or tubes.

   Fig 4: Checking Power Valve Actuator Clogging

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

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: Go to 6.

NG: Replace vacuum tank. Refer to "EXPLODED VIEW ".

1. Turn ignition switch OFF.
2. Disconnect VIAS control solenoid valve harness connector.
3. Turn ignition switch ON.
   Fig 5: Location Of VIAS Solenoid Valve And Power Valve Actuator

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between terminal 1 and ground with CONSULT-III or tester.

   Voltage: Battery voltage 

   OK or NG 

   OK: Go to  8.

   NG: Go to 7.

   Fig 6: Checking Voltage Between Terminal 1 And Ground

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

Check the following.

• Harness connectors E2, F32
• Harness for open or short between VIAS control solenoid valve and IPDM E/R
• Harness for open or short between VIAS control solenoid valve and ECM

  Repair harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 29 and VIAS control solenoid valve terminal 2.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

4. Also check harness for short to ground and short to power.

   OK or NG 

   OK: Go to 9.

   NG: Repair open circuit or short to ground or short to power in harness or connectors.

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: Go to 10.

NG: Replace VIAS control solenoid valve. Refer to "EXPLODED VIEW ".

Refer to "INTERMITTENT INCIDENT ".

INSPECTION END