EGR Vent/EGR Solenoids

EGR vent/EGR solenoids are mounted at rear of engine as a single assembly. Using input from engine speed sensor and Accelerator Pedal Position (APP) sensor, PCM controls EGR by controlling amount of "on" and "off" time of EGR solenoid. When EGR is not needed, PCM energizes EGR vent solenoid to vent vacuum. Vacuum is used to control EGR valve opening.