Diagnostic Procedure

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.

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.

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 resistance between swirl control valve terminal 2 and terminals 1, 3, terminal 5 and terminals 4, 6.

1. Resistance: 20.5 - 23.5Ω [At 20°C (68°F)] 

OK or NG 

1. OK: GO TO 5.
2. NG: Replace intake manifold assembly.

Fig 4: Checking Resistance Between Swirl Control Valve Terminals

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

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

1. INSPECTION END