Diagnostic Procedure

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 1: Disconnecting VIAS Control Solenoid Valve Harness Connector
  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
1. OK: GO TO 3.
2. NG: GO TO 2.
CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM relay.
3. Check harness continuity between ECM relay terminal 7 and VIAS control solenoid valve terminal 1.
  Refer to WIRING DIAGRAM .
4. Also check harness for short to ground and short to power.
  
  Fig 3: Disconnecting ECM Relay
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Continuity should exist.
OK or NG
1. OK: GO TO 3.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT-III
Check voltage between ECM relay terminal 6 and ground with CONSULT-II or tester.

Voltage: Battery voltage

Fig 4: Checking Voltage Between ECM Relay Terminal 6 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 5.
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
1. Harness connectors E10, F48
2. Fuse and fusible link box connector E22
3. 15A fuse
4. Harness for open or short between ECM relay and battery
  1. Repair or replace harness or connectors.
CHECK ECM RELAY
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 8.
2. NG: Replace ECM relay.
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
1. OK: GO TO 7.
2. 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
1. OK: GO TO 8.
2. NG: Replace VIAS control solenoid valve.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. INSPECTION END