Honda 2004 Odyssey Service Manual page 358

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Intake Air Bypass Control Thermal Valve

When the engine is running, the intake air bypass

control thermal valve sends air to the injectors.

Throttle Body

The throttle body is a single-barrel side draft type. The

lower portion of the throttle valve is heated by engine

coolant from the cylinder head. The idle adjusting

screw, which increases/decreases bypass air, is on top

of the throttle body.

IDLE ADJUSTING

POSITION (TP)

Catalytic Converter System

Three Way Catalytic Converter (TWC)

The TWC converts hydrocarbons (HC), carbon

monoxide (CO), and oxides of nitrogen (NOx) in the

exhaust gas to carbon dioxide (CO2), nitrogen (N2), and

water vapor.

Exhaust Gas Recirculation (EGR) System

Refer to the System Diagram to see a functional layout

of the system.

The EGR valve is designed to lower peak combustion

temperatures and reduce oxides of nitrogen emissions

(NOx) by recirculating exhaust gas through the intake

manifold and into the combusition chambers.

Positive Crankcase Ventilation (PCV) System

The PCV valve prevents blow-by gasses from escaping

into the atmosphere by venting them into the intake

: BLOW-BY VAPOR

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