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: Identifying 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 3, 600 rpm and make sure that power valve actuator rod moves.
OK or NG

OK: INSPECTION END

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

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

Fig 3: Identifying Power Valve Actuator
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.
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.

VIAS SOL VALVE SPECIFICATIONS

VIAS SOL VALVE	Vacuum
ON	Should exist
OFF	Should not exist

Fig 4: CONSULT-II Display - Active Test

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

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.
Check vacuum existence under the following conditions.

CONDITION VACUUM 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.

CHECK VACUUM HOSE

Fig 5: Checking Vacuum Existence
Courtesy of NISSAN MOTOR CO., U.S.A.
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 6: Checking Vacuum Hose
Courtesy of NISSAN MOTOR CO., U.S.A.
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 harness connector.
3. Turn ignition switch ON.
  
  Fig 7: Checking VIAS Control Solenoid Valve Power Supply Circuit
  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 8.

NG: GO TO 7.

Fig 8: Checking Voltage Between Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E110, M7
- Harness connectors M82, F102
- IPDM E/R connector E7
- 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.
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