Air Pump Solenoid

The air pump solenoid is located underhood on the left side of the engine near the engine coolant temperature sensor. The air pump solenoid is part of the AIR system and is used to control manifold vacuum to the shutoff valve. When the air pump solenoid is energized (PCM supplies ground), manifold vacuum will pull the shut off valve up and allow air from the air pump to flow past the check valve into the exhaust manifold.