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To reduce CO, HC, and NOx emissions, they are oxidized, reduced and converted into nitrogen (N
carbon dioxide (CO
) and water (H
2
Exhaust Port
CO
HC
NOx
EMISSION CONTROL SYSTEMS
THREE–WAY CATALYST (TWC)
SYSTEM
0) by the catalyst.
2
Main TWC
OXIDIZATION AND
REDUCTION
INSPECTION OF EXHAUST PIPE
ASSEMBLY
1.
CHECK CONNECTIONS FOR LOOSENESS OR DAMAGE
2.
CHECK CLAMPS FOR WEAKNESS, CRACKS OR
DAMAGE
INSPECTION OF CATALYTIC
CONVERTER
CHECK FOR DENTS OR DAMAGE
If any part of protector is damaged or dented to the extent that
it contacts the converter, repair or replace it.
–
Three–Way Catalyst (TWC) System
Sub–TWC
OXIDIZATION AND
REDUCTION
EC–11
),
2
Exhaust Gas
CO
2
H
O
2
N
2
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