EGR Control Solenoid: Description and Operation

EGR valve position sensor:

The dual EGR solenoid valve assembly consists of two dithering solenoid valves, Fig. 7. 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.