Air Switching Valve

This valve directs air injection flow to either the location near the exhaust ports or to the downstream injection point. It also serves as a relief valve at high engine speeds.

A vacuum signal from either a coolant control engine vacuum switch (CCEVS) or vacuum solenoid causes the switching valve to open, allowing air pump air to flow to the exhaust ports. When CCEVS shuts off vacuum signal to switching valve, a bleed orifice in vacuum line of combination valve allows vacuum to go to zero, causing valve to switch air pump air to injection point downstream.

Fig 1: Pulse Air Feeder System

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Fig 2: Air Pump Injection System (1.7L Engine)

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Fig 3: Cutaway View of Air Switching Valve

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