SsangYong Rexton. Service manual — part 413
M162 ENGINE CONTROLS 1F1-69
SSANGYONG Y200
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 converter and, in so doing, coming into
contact with rare metals (Pt and Rh).
The following chemical reaction are produced.
CO + O
2
→
CO
2
HC + O
2
→
CO
2
+ H
2
O
NO
x
→
N
2
+ O
2
SSANGYONG Y200
1F1-70 M162 ENGINE CONTROLS
YAD1F570
OXYGEN SENSOR
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
voltage with the voltage generated by oxygen sensor.
The amount of voltage the oxygen sensor generates is
proportionate to the difference between the amount of
oxygen 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
containing the two surface, the sensor generates less
voltage.
YAD1F580
When the exhaust gas is rich (below 14.7:1), the voltage
output is high, above450mv. 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:
•
Open loop / closed loop criteria
•
Ideal air / fuel ratio
M162 ENGINE CONTROLS 1F1-71
SSANGYONG Y200
YAD1F590
SSANGYONG Y200
1F1-72 M162 ENGINE CONTROLS
Oxygen sensor high
voltage
Oxygen sensor low
voltage
Oxygen sensor no
activity detected
Oxygen sensor not lean
after overrun fuel
shut-off
Oxygen sensor slow
response
Oxygen sensor heater
failure
Oxygen sensor heater
short circuit to battery
Oxygen sensor heater
short circuit to ground
or open
YAD1F600
Failure
Code
Description
Trouble Area
Maintenance Hint
When recognition the output
that more than nominal
threshold, malfunction of
sensing voltage.
When recognition the output
that more than nominal
threshold, malfunction of
sensing voltage.
When recognition the output
that not active the sensor etc.
When recognition the output
that no lean signal after
overrun fuel shut-off
When slow response of sensor
signal
When recognition the heating
circuit
When recognition the heating
currents that more or less than
set values (less than 0.2 A or
more than 2 A)
When recognition the heating
voltages than less than set
values (less than 2v)
•
Monitoring the actual output signal
through scan tool
•
Inspection the ECM pin 16, 17 about
short circuit or open with bad contact
•
Inspection the oxygen sensor
•
Inspection the ECM
•
Monitoring the heating status through
scan tool
•
Inspection the ECM pin 9 about short
circuit or open with bad contact
•
Inspection the heating power source
•
Inspection the heating circuit of oxygen
sensor
•
Inspection the ECM
80
89
82
83
84
85
86
87
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