EGR Electronic Vacuum Regulator Solenoid: Description and Operation

EGR Vacuum Regulator Solenoid:

Purpose
The EGR Vacuum Regulator (EGRVR) solenoid is used to regulate the vacuum supply to the EGR valve.

Construction
The solenoid is an electromagnetic device, containing a coil which magnetically controls the position of a disc to regulate the vacuum.

Operation
As the duty cycle to the coil increases, the vacuum signal passed through the solenoid to the EGR valve also increases. Vacuum not directed to the EGR valve is vented through the solenoid vent to atmosphere.
Note that at 0 percent duty cycle, or no electrical signal applied, the EGRVR solenoid allows some vacuum to pass, but not enough to open the EGR valve.