Diagnosis Procedure

With CONSULT-III 

1. Start engine and warm it up to normal operating temperature.
2. Perform "VIAS S/V-1" 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 as shown in the figure.

Fig 1: Identifying 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 1, 800 and 3, 600 RPM and make sure that power valve actuator rod moves as shown in the figure.
   NOTE: Use an inspection mirror (A) to confirm the operation of power valve actuator rod.
   • ← : Vehicle front
   • Power valve actuator (1)

Fig 2: Identifying Power Valve Actuator

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

OK or NG 

OK: INSPECTION END 

NG (With CONSULT-III): GO TO 2.

NG (Without CONSULT-III): GO TO  3.

With CONSULT-III 

1. Stop engine and disconnect vacuum hose connected to power valve actuator.
2. Install the vacuum gauge as shown in the figure.
3. Start engine and let it idle.
4. Perform "VIAS S/V-1" in "ACTIVE TEST" mode with CONSULT-III.
5. Turn VIAS control solenoid valve ON and OFF, and check vacuum existence under the following conditions.

Fig 3: Identifying Power Valve Actuator, Vacuum Gauge And VIAS Control Solenoid Valve

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

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. Install the vacuum gauge as shown in the figure.
3. Disconnect VIAS control solenoid valve harness connector.
4. Start engine and let it idle.
5. Apply 12 V of direct current between VIAS control solenoid valve terminals 1 and 2.
   Fig 4: Applying 12 V Of Direct Current Between VIAS Control Solenoid Valve Terminals 1 And 2

   Courtesy of NISSAN MOTOR CO., U.S.A.
6. Check vacuum existence under the following conditions.
   VACUUM EXISTENCE REFERENCE
   
   

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

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 crack, clogging, improper connection or disconnection. Refer to , "VACUUM HOSE DRAWING ".

OK or NG 

OK: GO TO 5.

NG: Repair hoses or tubes.

Fig 5: Checking Hoses And Tubes

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

Refer to , "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO 6.

NG: Replace vacuum tank.

1. Turn ignition switch OFF.
2. Disconnect VIAS control solenoid valve (2) harness connector.
3. Turn ignition switch ON.
   • ← : Vehicle front
   • Power valve actuator (1)
   Fig 6: Identifying VIAS Control Solenoid Valve And Power Valve Actuator

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

Voltage: Battery voltage 

Fig 7: Checking Voltage Between VIAS Control Solenoid Valve Terminal 1 And Ground

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

OK or NG 

OK: GO TO  8.

NG: GO TO 7.

Check the following.

• Harness connectors E5, F14
• 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 TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

INSPECTION END