Auxiliary Intake Air Control Solenoid Inspection With Scan Tool
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
The auxiliary intake air control solenoid is operated by the Powertrain Control Module (PCM). PCM supplies a ground path to the solenoid control circuit using an internal solid state device called a driver. When PCM commands the solenoid ON, voltage on the control circuit should be near zero or low. When PCM commands the solenoid OFF, voltage on the control circuit should be near battery voltage or high. When the solenoid is energized, manifold vacuum is applied to the vacuum motor and the auxiliary inlet air duct door is closed.