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EGR Control Solenoid: Description and Operation

EGR solenoid valve assembly (dithering type):

The dual EGR solenoid valve assembly consists of two dithering solenoid valves. The first is a vacuum valve which supplies vacuum to the sonic EGR valve when energized. The second is a vent valve which vents the EGR valve to the atmosphere when de-energized. Both solenoid valves receive variable duty cycle signals from the EEC system according to EGR requirements.