EGR Control Solenoid: Description and Operation

The ECM controls vacuum to the EGR valve electronically--through the EGR bleed solenoid.
- When the engine is warm the solenoid is de-energized allowing vacuum to the EGR valve.
- When the engine is cold the solenoid is energized blocking vacuum to the EGR valve.
- The solenoid also decreases the amount of vacuum to the EGR valve when the torque converter clutch is engaged.