Diagnostic Procedure

CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Perform "VIAS SOL VALVE" in "ACTIVE TEST" mode with CONSULT-II.
  
  Fig 1: CONSULT-II Display - ACTIVE TEST
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Turn VIAS control solenoid valve ON and OFF, and make sure that power valve actuator rod moves.
  
  Fig 2: Turning VIAS Control Solenoid Valve On And Off
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Rev engine quickly up to above 5, 000 rpm and make sure that power valve actuator rod moves.
  
  Fig 3: Identifying Power Valve Actuator Rod Moves
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: INSPECTION END

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

NG (Without CONSULT-II): GO TO 3.

CHECK VACUUM EXISTENCE

With CONSULT-II

Stop engine and disconnect vacuum hose connected to power valve actuator.
Start engine and let it idle.
Perform "VIAS SOL VALVE" in "ACTIVE TEST" mode with CONSULT-II.

Fig 4: CONSULT-II Display - ACTIVE TEST

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

Turn VIAS control solenoid valve "ON" and "OFF", and check vacuum existence under the following conditions.

VIAS SOL VALVE & VACUUM 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.

CHECK VACUUM EXISTENCE

Without CONSULT-II

Stop engine and disconnect vacuum hose connected to power valve actuator.
Disconnect VIAS control solenoid valve harness connector.
Start engine and let it idle.
Apply 12V of direct current between VIAS control solenoid valve terminals 1 and 2.

Fig 5: Applying 12V Of Direct Current Between VIAS Control Solenoid Valve Terminals

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

Check vacuum existence under the following conditions.

VACUUM CONDITION SPECIFICATION

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.

CHECK VACUUM HOSE
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 6: Checking Hoses And Tubes Between Intake Manifold & Power Valve Actuator
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 5.

NG: Repair hoses or tubes.
CHECK VACUUM TANK
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 6.

NG: Replace vacuum tank.
CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect VIAS control solenoid valve harness connector.
3. Turn ignition switch ON.
  
  Fig 7: Disconnecting VIAS Control Solenoid Valve Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between VIAS control solenoid valve terminal 1 and ground with CONSULT-II or tester.
  Voltage: Battery voltage
OK or NG

OK: GO TO 7.

NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
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 8.

NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK VIAS CONTROL SOLENOID VALVE
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 9.

NG: Replace VIAS control solenoid valve.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END