Exhaust Gas RECIRCULATION: Notes

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ECM controls EGR system based on engine operating conditions. ECM controls ground circuit for EGR Control (EGRC) solenoid opening and closing EGR valve as necessary. See Fig 1. EGR-VCV or EGRC solenoid remains closed under certain conditions including the following:

Engine stopped.
Engine starting.
Engine idling.
Low engine coolant temperature.
Excessively high engine coolant temperature.
High engine speed.
Mass airflow sensor malfunction.

Fig 1: Identifying EGR System Components (Frontier 2.4L & Xterra 2.4L)

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