Three-Way Catalytic Converter System - Yamaha FJR1300N 2001 Service Manual

THREE-WAY CATALYTIC CONVERTER SYSTEM

System outline
This is a highly efficient exhaust gas cleaning system that effects air-fuel control through a joint
effort by the FI system, O
prehensive control of the air-fuel ratio in this manner, this system reduces the CO, HC, and NOx in
the exhaust gases.
The FI system controls the mixture to an optimal air-fuel ratio (basic air-fuel ratio) that matches the
operating condition of the engine in order to realize an ideal combustion.
Furthermore, an O sensor that detects the concentration of oxygen that remains in the exhaust gas
2
is provided in the exhaust pipe for the purpose of maximizing the performance of the three-way cat-
alytic converter and to clean the exhaust gas at a high degree of efficiency. Based on this data, the
ECU applies more precise compensation to the basic air-fuel ratio, in order to maintain the mixture
in the vicinity of the stoichiometric air-fuel ratio of 14.7:1.
Through the joint effort of these control systems, the exhaust gas is cleaned in a highly efficient
manner without sacrificing engine performance.
Three-way catalytic converter system diagram
1 Ignition coil
2 Injector
3 Intake temperature
sensor
4 Throttle position sen-
sor
sensor, and the three-way catalytic converter system. By effecting com-
2
5 Intake
air pressure
sensor
6 Crankshaft position
sensor
7 O
sensor
2
8 Coolant temperature
sensor
FEATURES
9 Cylinder identification
sensor
0 Spark plug
A ECU
1 - 26
GEN
INFO
B Igniter
C Atmospheric pressure
sensor
D Catalytic converter