System Description

Fig 1: EGR Function Description Chart

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

This system cuts and controls vacuum applied to the EGR valve to suit engine operating conditions. This cut-and-control operation is accomplished through the ECM and the EGRC solenoid valve. When the ECM detects any of the following conditions, current through the solenoid valve is cut. This causes the vacuum to be cut. The EGR valve remains closed.

• Engine stopped
• Low engine coolant temperature
• Engine starting
• High-speed engine operation
• Engine idling
• Excessively high engine coolant temperature
• Wide open throttle
• Mass air flow sensor malfunction

Fig 2: EGR And Vacuum System Diagram

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