## Fuel and Emissions Systems

#### System Descriptions (cont'd)

11-20

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), dinitrogen (N2), and water vapour.

1. HOUSING
2. FRONT OF VEHICLE
3. THREE WAY CATALYSTS

Exhaust Gas Recirculation (EGR) System

Refer to the System Diagram to see the functional layout of the system.

EGR Valve

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 combustion chambers.

Positive Crankcase Ventilation (PCV) System

The PCV valve prevents blow-by gasses from escaping into the atmosphere by venting them into the intake manifold.

1. PCV HOSE
2. BREATHER PIPE
3. INTAKE MANIFOLD
4. PCV VALVE
5. BLOW BY VAPOUR
6. FRESH AIR