Air Injection System: Description

The air induction system is used to reduce hydrocarbon (HC) and carbon monoxide (CO) emissions by supplying filtered air to the exhaust manifold. System consists of an air induction valve, induction valve filter, air injection tubes, and various connecting hoses.

Fig 1: Air Induction System (Pickup & Stanza) Note direction of air flow.

In addition, an anti-backfire valve is used on all models. A vacuum switching valve and a boost valve is used Pickup models. A water temperature sensor and vacuum switching valve is used on Sentra M.P.G. models.

Fig 2: Air Induction System (Sentra - M.P.G.) Note direction of flow.