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.
3. Turn VIAS control solenoid valve "ON" and "OFF", and make sure that power valve actuator rod moves.
  
  Fig 1: Identifying Power Valve Actuator And Power Valve Actuator Rod (With CONSULT-II)
  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 up to 3, 600 rpm and make sure that power valve actuator rod (2) moves.
  - Power valve actuator (1)
OK or NG

OK : INSPECTION END

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

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

Fig 2: Identifying Power Valve Actuator And Power Valve Actuator Rod (Without CONSULT-II)
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK VACUUM EXISTENCE

With CONSULT-II

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

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

Fig 3: Identifying Power Valve Actuator, VIAS Control Solenoid Valve & Vacuum Gauge (With CONSULT-II)

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

VACUUM DESCRIPTION

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.
Install the vacuum gauge as shown in the figure.
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 4: Identifying Power Valve Actuator, VIAS Control Solenoid Valve & Vacuum Gauge (Without CONSULT-II)
Courtesy of NISSAN MOTOR CO., U.S.A.

Check vacuum existence under the following conditions.

VACUUM CONDITIONS

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 ".
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
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-II or tester.
  Voltage: Battery voltage
OK or NG

OK : GO TO 8.

NG : GO TO 7.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E20, F32
- IPDM E/R connector E122
- 10A fuse
- Harness for open or short between VIAS control solenoid valve and fuse
  : 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 9.

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 10.

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

: INSPECTION END