System Description

Fig 1: Sensor, Actuator Description Chart

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

This system has a swirl control valve in the intake passage of each cylinder.

While idling and during low engine speed operation, the swirl control valve closes. Thus the velocity of the air in the intake passage increases, promoting the vaporization of the fuel and producing a swirl in the combustion chamber.

Because of this operation, this system tends to increase the burning speed of the gas mixture, improve fuel consumption, and increase the stability in running conditions.

Also, except when idling and during low engine speed operation, this system opens the swirl control valve. In this condition, this system tends to increase power by improving intake efficiency via reduction of intake flow resistance, intake flow.

The solenoid valve controls swirl control valve's shut/open condition. This solenoid valve is operated by the ECM.

Fig 2: Accelerator Pedal Position Sensor And Swirl Control Valve Position Chart

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

When engine coolant temperature is below 10°C (50°F) and above 55°C (131°F), swirl control valve is kept open regardless of above condition.

Fig 3: Identifying Solenoid Valve Controls Swirl Control Valve's Shut/Open Condition

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