Three-Way Catalyst(Twc) System - Toyota Land Cruiser 1988 Repair Manual

EMISSION CONTROL SYSTEMS- Three-way Catalyst (TWC) System EC-21
NOx
co
HC
THREE-WAY CATALYST(TWC) SYSTEM
Three-way Catalyst
(Monolithic)
EC2736
To reduce HC, CO and NOx emissions, they are oxidized, reduced and converted to nitrogen (N2}, carbon
dioxide (C02) and water (H20)
by
the catalyst.
Exhaust Port
~
HC, CO and NOx
v
EC2902
TWC
-\
Exhaust Gas
Oxidation and
-1
reduction
INSPECTION OF EXHAUST PIPE
ASSEMBLY
C02
H20
N2
1. CHECK CONNECTIONS FOR LOOSENESS OR
DAMAGE
2. CHECK CLAMPS FOR WEAKNESS, CRACKS OR
DAMAGE
INSPECTION OF CATALYST CONVERTER
CHECK FOR DENTS OR DAMAGE
If any part of the protector is damaged or dented to the
extent that it contacts the catalyst, repair or replace it.