EGR Control Solenoid: Description and Operation

EGR Control Solenoid Valve:

PURPOSE
The Exhaust Gas Recirculation (EGR) Control Solenoid will either allow vacuum to pass to the EGR Valve or vent the vacuum based on signals from the ECCS Control Module (ECM).

OPERATION
If the ECM senses:
^ Low engine coolant temperature
^ Engine cranking
^ High engine speed
^ Engine idling
^ Excessively high coolant temperature
it energizes the EGR Control Solenoid. An energized solenoid will vent the vacuum signal and NOT allow EGR operation.
If the ECM senses any condition other than above, the EGR Solenoid will be de-energized and allow vacuum to pass.