Diagnostic 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: Identifying Power Valve Actuator Rod

   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 (2) moves as shown in the figure.
   • Power valve actuator (1)
Fig 2: Identifying Power Valve Actuator Rod
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 Fig 3.
3. Start engine and let it idle.
4. Perform "VIAS SOL VALVE" 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: CONSULT-III Display - Active Test

   Courtesy of NISSAN MOTOR CO., U.S.A.
   VIAS SOL VALVE SPECIFICATION
   
   

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

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

   Condition	Vacuum
   12V 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 ."
Fig 5: Checking Hoses And Tubes Between Intake Manifold And Power Valve Actuator
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO  5.

NG: Repair hoses or tubes.

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.
   • Power valve actuator (1)
3. Turn ignition switch ON.
   Fig 6: Identifying VIAS Control 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 

Fig 7: Checking Voltage Between Terminal 1 And Ground With CONSULT-III Or Tester
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO  8.

NG: GO TO  7.

Check the following.

• Harness connectors E131, M92
• Harness connectors M70, F58
• 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