SsangYong Korando II (1996-2006 year). Manual — part 61
M162 ENGINE CONTROLS 1F1 -- 79
DAEWOO MY_2000
EXHAUST SYSTEM
CATALYTIC CONVERTER
The purpose of the catalytic converter is to convert the three pollutants of carbon monoxide (CO), hydrocarbons (HC)
and oxides of nitrogen (NOx) contained in the exhaust of gasoline engines, into the harmless compounds of water
(H2O), carbon dioxide (CO2) and nitrogen (N2).
The catalytic converter contains a catalyst, a word coming from the Greek and which designates the element essential
for catalyst which triggers chemical reactions without itself being consumed.
These catalysts in the 3--way catalytic converter are the rare metals platinum (Pt) and rhodium (Rh).
The catalytic converter consists essentially of three main elements. The exhaust gases flow through the catalytic con-
verter and, in so doing, coming into contact with rare metals (Pt and Rh).
The following chemical reaction are produced.
CO + O2 → CO2
HC + O2 → CO2 + H2O
NOx → N2 + O2
1F1 -- 80 M162 ENGINE CONTROLS
DAEWOO MY_2000
OXYGEN SENSOR
YAA1F650
The oxygen sensor is unique among the engine control sensors because is acts like a battery and is able to generate
its own low voltage signal. It is located the exhaust system and monitors the amount of oxygen in the exhaust stream
and provides feedback to the Engine Control Module (ECM).
The electrically heated oxygen sensor warms up quickly and remains hot, even at idle when the exhaust manifold may
cool down.
The ECM applies a reference voltage of 450 mv to the
oxygen sensor, the ECM compares this reference volt-
age with the voltage generated by oxygen sensor. The
amount of voltage the oxygen sensor generates is pro-
portionate to the difference between the amount of oxy-
gen in the outside air and the exhaust gases. The
atmosphere contains about 21% oxygen. The exhaust
from a rich air/fuel ratio contains almost no oxygen. With
a large difference between the amounts of oxygen con-
taining the two surface, the sensor generates less volt-
age. When the exhaust gas is rich (below 14.7:1), the
voltage output is high, above 450 mv. When the exhaust
gas is lean (above 14.7:1 air/fuel ratio), the sensor’s
voltage output is low, below 450 mv.
The ECM uses oxygen sensor information for:
D
Open loop / closed loop criteria
D
Ideal air / fuel ratio
YAA1F660
M162 ENGINE CONTROLS 1F1 -- 81
DAEWOO MY_2000
YAA1F670
1F1 -- 82 M162 ENGINE CONTROLS
DAEWOO MY_2000
KAB1F340
Failure
Code
Description
Trouble Area
Maintenance Hint
80
Oxygen sensor high
voltage
When recognition the output
that more than nominal
threshold, malfunction of
sensing voltage.
89
Oxygen sensor low
voltage
When recognition the output
that more than nominal
threshold, malfunction of
sensing voltage.
D
Monitoring the actual output signal
through scan tool
D
Inspection the ECM pin 16, 17 about
h t i
it
ith b d
t t
82
Oxygen sensor no
activity detected
When recognition the output
that not active the sensor etc.
short circuit or open with bad contact
D
Inspection the oxygen sensor
D
Inspection the ECM
83
Oxygen sensor not lean
after overrun fuel
shut--off
When recognition the output
that no lean signal after
overrun fuel shut--off
D
Inspection the ECM
84
Oxygen sensor slow
response
When slow response of
sensor signal
85
Oxygen sensor heater
failure
When recognition the heating
circuit
D
Monitoring the heating status through
scan tool
86
Oxygen sensor heater
short circuit to battery
When recognition the heating
currents that more or less
than set values (less than 0.2
A or more than 2 A)
scan tool
D
Inspection the ECM pin 9 about short
circuit or open with bad contact
D
Inspection the heating power source
D
Inspection the heating circuit of
87
Oxygen sensor heater
short circuit to ground or
open
When recognition the heating
voltages than less than set
values (less than 2 v)
D
Inspection the heating circuit of
oxygen sensor
D
Inspection the ECM
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