EGR Control Solenoid: Description and Operation

EGR Solenoid:

Vacuum for the Exhaust Gas Recirculation (EGR) valve is controlled by the EGR solenoid. The solenoid, located on the right side shield in the engine compartment, is controlled by the engine controller.

When the engine controller ENERGIZES the solenoid, the vacuum passage to the EGR valve is CLOSED. The solenoid is ENERGIZED during engine warm-up, idle, wide open throttle, and rapid deceleration/acceleration. Since the vacuum signal is halted with solenoid activation, driveability problems will occur if the solenoid is disconnected.

On California vehicles the engine controller monitors EGR system operation and sets a fault code if the system performance is unsatisfactory. At the same time the CHECK ENGINE light will be illuminated, indicating a need for vehicle service.