Diagnostic Procedure

CHECK HOSES
1. Turn ignition switch "OFF".
2. Check hose for clogging or improper connection.
  
  Fig 1: Checking Hose For Clogging Or Improper Connection
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG: Repair or reconnect the hose.
CHECK SWIRL CONTROL VALVE CONTROL VACUUM CHECK SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect swirl control valve control vacuum check switch harness connector.
  
  Fig 2: Disconnecting Swirl Control Valve Control Vacuum Check Switch Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check harness continuity between terminal 2 and ground. Refer to WIRING DIAGRAM .
  Continuity should exist.
3. Also check harness for short to power.
OK or NG
1. OK: GO TO 4 .
2. NG: GO TO 3.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E1, M1
- Harness connectors M32, F23
- Harness connectors F22, M33 (A/T models)
- Joint connector F204
- Harness for open or short between swirl control valve control vacuum check switch and ECM
- Harness for open or short between swirl control valve control vacuum check switch and TCM
1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK SWIRL CONTROL VALVE CONTROL VACUUM CHECK SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. connect ECM harness connector.
2. Check harness continuity between ECM terminal 59 and swirl control valve control vacuum check switch terminal 1.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 6 .
2. NG: GO TO 5.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E1, M1
- Harness connectors M94, F27
- Harness for open or short between swirl control valve control vacuum check switch and ECM
1. Repair open circuit or short to ground or short to power in harness connectors.
CHECK SWIRL CONTROL VALVE CONTROL VACUUM CHECK SWITCH
1. ignition switch "OFF".
2. Disconnect vacuum hose connected to swirl control valve control vacuum check switch.
3. Attach vacuum pump to swirl control valve control vacuum check switch.
4. Turn ignition switch "ON".
5. Check voltage between ECM terminal 59 and ground under the following conditions.
  
  Fig 3: Checking Voltage Between ECM Terminal 59 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Applied Pressure/Voltage Specification Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 7.
2. NG: Replace swirl control valve control vacuum check switch.
CHECK SWIRL CONTROL VALVE CONTROL SOLENOID VALVE
With CONSULT-II
1. Reconnect the disconnected harness connectors.
2. Start engine and let it idle.
3. Remove vacuum hose connected to swirl control valve actuator.
4. Select "SWIRL CONT SOL VALVE" in "ACTIVE TEST" mode with CONSULT-II.
5. Touch "ON" and "OFF" on CONSULT-II screen.
6. Check vacuum existence and operation delay time under the following conditions.
  
  Fig 5: Checking Vacuum Existence And Operation Delay Time (With CONSULT-II)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Operation takes less than 1 second.
Without CONSULT-II
1. Reconnect ECM harness connector.
2. Remove vacuum hose connected to swirl control valve actuator.
3. Start engine and let it idle.
4. Apply 12V of direct current between swirl control valve control solenoid valve terminals and 2.
5. Check vacuum existence and operation delay time under the following conditions.
  
  Fig 6: Checking Vacuum Existence And Operation Delay Time (Without CONSULT-II)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Operation takes less than 1 second.
OK or NG
1. OK: GO TO 8.
2. NG: Replace intake manifold collector assembly.
CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT " .
1. INSPECTION END