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: Checking Function Of Power Valve Actuator
  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 2: Checking Function Of Power Valve Actuator
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: INSPECTION END
2. NG: GO TO 2.
CHECK VACUUM EXISTENCE
With CONSULT-II
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-II.
4. Turn VIAS control solenoid valve ON and OFF, and check for the existence of vacuum under the following conditions.
  
  Fig 3: Checking For Vacuum Existence Based On Conditions
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Displaying Vacuum Existence Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II
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 for the existence of vacuum under the following conditions.
  
  Fig 5: Checking Vacuum Existence Based On Conditions
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 6: Displaying Vacuum Existence Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Repair or replace power valve actuator.
2. NG: GO TO 3.
CHECK VACUUM HOSE
1. Stop engine.
2. Check hoses and tubes between intake manifold and power valve actuator for crack, clogging, disconnection or improper connection.
  
  Fig 7: Checking Vacuum Hose
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4
2. NG: Replace vacuum hose.
CHECK VACUUM TANK
1. Disconnect vacuum hose connected to vacuum tank.
2. Connect a vacuum pump to port (at the center) of vacuum tank.
3. Apply vacuum and make sure that vacuum exists at another port.
  
  Fig 8: Checking Vacuum Tank
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 5.
2. NG: Replace vacuum tank.
CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
1. Stop engine.
2. Disconnect VIAS control solenoid valve harness connector. See Figure
3. Turn ignition switch ON.
4. Check voltage between terminal 1 and ground with CONSULT-II or tester. See Figure .
OK or NG
1. OK: GO TO 7 .
2. NG: GO TO 6.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M229, F66
- Fuse block (J/B) connector M19
- 15A fuse
- Harness continuity between fuse and VIAS control solenoid valve
1. : Repair 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 27 and terminal 2.
  Refer to Wiring Diagram.
  
  Continuity should exist.
4. Also check harness for short to ground and short to power.
  OK or NG
  1. OK: GO TO 8.
  2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK VIAS CONTROL SOLENOID VALVE
With CONSULT-II
1. Reconnect disconnected harness connector.
2. Turn ignition switch ON.
3. Perform VIAS SOL VALVE in ACTIVE TEST mode.
4. Check air passage continuity and operation delay time under the following conditions. See Figure and Figure .
Without CONSULT-II

Check air passage continuity and operation delay time under the following conditions. See Figure and Figure .

OK or NG
1. OK: GO TO 9.
2. NG: Replace VIAS control solenoid valve.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. : INSPECTION END