Toyota TERCEL 1985 Repair Manual page 124

EC-36 EMISSION CONTROL SYSTEMS - Three-way and Oxidation Catalyst (TWC-OC) System
THREE-WAY AND OXIDATION CATALYST (TWC-OC)
To reduce HC, CO and NOx emissions, they are oxidized, reduced and converted to nitrogen (N
(C0 ) and water (H 0) by the catalyst.
2 2
Exhaust Port
o
HC, CO and NOx
\
•m
AS Valve
Three-way Catalyst (TWC)
(Monolithic)
Three-way Catalyst
Oxidation 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 the protector is damaged or dented to the
extent that it contacts the catalyst, repair or replace it.
EC0490
SYSTEM (Federal Vehicles)
Oxidation Catalyst (OC)
(Monolithic)
Oxidation Catalyst (OC)
Air
O.
Oxidation
/
/
0 0 * N* HJO
), carbón dioxide
2
Exhaust Gas
C0
2
H 0
2
Y
N
2