Diagnostic Procedure

CHECK SWIRL CONTROL VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect swirl control valve harness connector.
  
  Fig 1: Locating Swirl Control Valve Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Turn ignition switch ON.
4. Check voltage between swirl control valve terminals 2, 5 and ground with CONSULT-II or tester.
  - Voltage: Battery voltage
  Fig 2: Checking Voltage Between Swirl Control Valve Connector Terminals 2, 5 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK : GO TO 3.
- NG : GO TO 2.
DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between swirl control valve and ECM relay
  - : 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

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check harness continuity between ECM terminals and swirl control valve terminals as follows. Refer to WIRING DIAGRAM .

SWIRL VOLUME CONTROL VALVE & ECM TERMINAL REFERENCE

ECM terminal	Swirl volume control valve
17	6
18	3
19	4
20	1

Continuity should exist.

Also check harness for short to ground and short to power.

OK or NG

OK : GO TO 4.
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 terminals 1, 3, terminal 5 and terminals 4, 6.
- Resistance: 20.5 - 23.5Ω [at 20°C (68°F)]
OK or NG
- OK : GO TO 5.
- NG : Replace intake manifold collector assembly.
CHECK GROUND CONNECTIONS
Loosen and retighten two ground screws on the body. Refer to "GROUND INSPECTION ".

Fig 4: Checking ECM Ground Connections
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
- OK : GO TO 6.
- NG : Repair or replace ground connections.
CHECK SWIRL CONTROL VALVE POSITION SENSOR POWER SUPPLY CIRCUIT
1. Disconnect swirl control valve position sensor harness connector.
2. Turn ignition switch ON.
  
  Fig 5: Identifying Swirl Control Valve Position Sensor
  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.
  - Voltage: Approximately 5V
OK or NG
- OK : GO TO 7.
- NG : Repair open circuit or short to ground or short to power in harness connectors.
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 .
  - Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
- OK : GO TO 9.
- 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
  - : 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 .
  - Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
- OK (With CONSULT-II) : GO TO 10.
- 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
- OK : Replace intake manifold assembly.
- NG : Repair or replace.