Diagnostic Procedure

CHECK SWIRL CONTROL VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect swirl control valve harness connector.
3. Turn ignition switch ON.
  
  Fig 1: Disconnecting Swirl Control Valve Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between swirl control valve terminals 2, 5 and ground with CONSULT-II or tester.
  1. Voltage: Battery voltage
OK or NG
1. OK: GO TO 3.
2. NG: GO TO 2.
Fig 2: Checking Voltage Between Swirl Control Valve Terminals 2, 5 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between swirl control valve and ECM relay
  1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK SWIRL CONTROL VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals and swirl control valve terminals as follows.
  Refer to WIRING DIAGRAM .
  
  Fig 3: ECM Terminals And Swirl Control Valve Terminals Reference Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 4.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK SWIRL CONTROL VALVE
Check resistance between swirl control valve terminal 2 and terminal 1, 3, terminal 5 and terminals 4, 6.
1. Resistance: 20.5 - 23.5 Ω [at 20°C (68°F)]
OK or NG
1. OK: GO TO 5.
2. NG: Replace intake manifold collector assembly.
Fig 4: Checking Resistance Between Swirl Control Valve Terminals
Courtesy of NISSAN MOTOR CO., U.S.A.
RETIGHTEN GROUND SCREWS
Loosen and retighten engine ground screws.
1. GO TO 6.
Fig 5: Retightening Ground Screws
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK SWIRL CONTROL VALVE POSITION SENSOR POWER SUPPLY CIRCUIT
1. Disconnect swirl control valve position sensor harness connector.
2. Turn ignition switch ON.
  
  Fig 6: Disconnecting Swirl Control Valve Position Sensor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between swirl control valve position sensor terminal 3 and ground with CONSULT-II or tester.
  1. Voltage: Approximately 5V
OK or NG
1. OK: GO TO 7.
2. NG: Repair open circuit or short to ground or short to power in harness connectors.
Fig 7: Checking Voltage Between Swirl Control Valve Position Sensor Terminal 3 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK SWIRL CONTROL VALVE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect TCM harness connector.
4. Check harness continuity between swirl control valve position sensor terminal 1 and ECM terminal 67, TCM terminal 42.
  Refer to WIRING DIAGRAM .
  1. Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 3.
2. NG: GO TO 8.
DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between swirl control valve position sensor and TCM
- Harness for open or short between swirl control valve position sensor and ECM
  1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK SWIRL CONTROL VALVE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 54 and swirl control valve position sensor terminal 2.
  Refer to WIRING DIAGRAM .
  1. Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
1. OK (With CONSULT-II): GO TO 10.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

OK or NG
1. OK: Replace intake manifold assembly.
2. NG: Repair or replace.