Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Auxiliary Intake Air Control System
| Callout | Component Name |
|---|---|
| 1 | Vacuum Supply Hose |
| 2 | Manifold Vacuum to Solenoid |
| 3 | Manifold Vacuum to Intake Air Door |
| 4 | Auxiliary Intake Air Control Solenoid |
| 5 | Upper Air Cleaner Housing |
| 6 | Vacuum Storage Chamber |
| 7 | Intake Air Door Motor |
| 8 | Vacuum Check Valve |
The auxiliary intake air control system supplies additional air to the engine during hard acceleration and when operating under high engine loads. The lower air cleaner (ACL) housing has two inlet air ducts. The auxiliary inlet air duct is opened or closed by a vacuum operated door. Manifold vacuum is supplied to the door motor (7) by a vacuum solenoid (4). The solenoid is low side controlled by the powertrain control module (PCM). A constant supply of vacuum pressure is assured by the use of a vacuum check valve (8) and a vacuum storage chamber (6). The auxiliary intake air door is open when there is no vacuum applied. The PCM closes the door for most driving conditions. For diagnosis of the auxiliary intake air system refer to Auxiliary Intake Air System Diagnosis .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.