System Description

WARNING: This page is about a different car, the 2004 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Sensor 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 flows through the solenoid valve is cut. This causes the vacuum to be discharged into the atmosphere. The EGR valve remains closed.

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

Fig 2: EGR And Vacuum Chart

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