DTC P1130: Swirl Control Valve Control Solenoid Valve : Description

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

This engine control system has a swirl control valve in the intake passage of each cylinder. When idling, and during low engine speed operation, swirl control valve close and velocity of air in intake passage increases, promoting vaporization of fuel and producing a swirl in combustion chamber. Because of this operation, this system tends to increase burning speed of the gas mixture, improve fuel consumption, and increase stability in running conditions. Except when idling and during low engine speed operation, this system opens swirl control valve. In this condition, this system tends to increase power by improving intake efficiency via reduction of intake flow resistance by increasing intake flow. The solenoid valve controls swirl control valve's open/closed condition. Swirl control solenoid valve is operated by the ECM.

SCV control solenoid valve responds to signals from ECM. When ECM sends an ON signal, SCV solenoid valve is bypassed to apply intake manifold vacuum to the SCV actuator. This operation closes the SCV. When the ECM sends an OFF signal, vacuum signal is cut and SCV actuator opens.

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