SsangYong Korando II (1996-2006 year). Manual — part 125
1F2 -- 80 M161 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
M161 ENGINE CONTROLS 1F2 -- 81
DAEWOO MY_2000
YAA1F670
1F2 -- 82 M161 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
M161 ENGINE CONTROLS 1F2 -- 83
DAEWOO MY_2000
Failure
Code
Description
Trouble Area
Maintenance Hint
81
Bank 1 system short
term fuel trim adaptation
below lean threshold
When recognition the value
less than nominal control
threshold, it means that when
big deviation in control range
of adaptation values through
fuel and air mixture formation
93
Bank 1 system short
term fuel trim adaptation
above rich threshold
When recognition the value
more than nominal control
threshold, it means that when
big deviation in control range
of adaptation values through
fuel and air mixture formation
96
Bank 1 system short
term fuel trim at rich
stop
When recognition the short
term fuel trim that more than
nominal threshold
97
Bank1 system short
term fuel trim at lean
stop
When recognition the short
term fuel trim that less than
nominal threshold
D
Inspection the intake air leakage
D
Inspection the injection quantities with
98
Bank 1 system idle
adaptation failure (above
rich threshold)
When recognition the long
term fuel trim exceeds rich
threshold
D
Inspection the injection quantities with
injector block or leakage
D
Inspection the exhaust leakage
D
Inspection the ECM
99
Bank 1 system idle
adaptation failure (below
rich threshold)
When recognition the long
term fuel trim exceeds lean
threshold
p
100
Bank 1 system learning
control failure (rich, low
load)
When recognition the long
term fuel trim exceeds rich
threshold
101
Bank 1 system learning
control failure (lean, low
load)
When recognition the long
term fuel trim exceeds lean
threshold
102
Bank 1 system learning
control failure (rich, high
load)
When recognition the long
term fuel trim exceeds rich
threshold
103
Bank 1 system learning
control failure (rich, low
load)
When recognition the long
term fuel trim exceeds lean
threshold
Circuit Description
In order to control emissions, a catalytic converter is used to covert harmful emissions into harmless water vapor and
carbon dioxide. The ECM has the ability to monitor this process by using a oxygen sensor. The oxygen sensor pro-
duces and output signal which indicates the storage capacity of the catalyst. This in turn indicates the catalyst’s ability
to convert exhaust emission effectively. If the oxygen sensor pigtail wiring, connector, or terminal is damaged. Do not
attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly, it must have a clean air
reference provided to it. This clean air reference is obtained by way of the oxygen sensor wire(s). Any attempt to repair
the wires, connector, or terminal and degrade the oxygen sensor performance.
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