Emission Control

The ECU controls the EGR valve operation. By energizing the EGR solenoid, vacuum is shut off, making this system non-operative. When the engine reaches normal operating temperatures, the ECU de-energizes the solenoid. When de-energized, the solenoid allows vacuum to flow to the EGR valve. The ECU will energize the solenoid whenever EGR action is undesirable, during idle, cold engine operation, wide open throttle and rapid acceleration or deceleration.