Subaru Legacy IV (2008 year). Manual — part 610
GD(H6DO)-60
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AO:DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)
1. OUTLINE OF DIAGNOSIS
Detect continuity NG of the oxygen sensor. If the oxygen sensor voltage reading is not within the probable
range considering the operating conditions, judge as NG.
2. COMPONENT DESCRIPTION
(A)
Electromotive force
(C)
Rich
(E)
Theoretical air fuel ratio
(B)
Air fuel ratio
(D)
Lean
(F)
Comparative voltage
(1)
Atmosphere
(2)
Exhaust gas
(3)
Electromotive force
EN-01696
(3)
V
(1)
(2)
(2)
(E)
(F)
(C)
(B)
(D)
(A)
GD(H6DO)-61
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITION
Used for abnormality judgment
Secondary Parameters
Enable Conditions
High
Secondary air system
Not in operation
Closed loop control at the oxygen sensor In operation
Misfire detection every 200 rotations
< 7 time(s)
Front oxygen (A/F) sensor compensation
coefficient
Not in limit value
Battery voltage
t 10.9 V
Engine coolant temperature
t 75 °C (167 °F)
Low (1)
Secondary air system
Not in operation
Closed loop control at the oxygen sensor In operation
Misfire detection every 200 rotations
< 7 time(s)
Front oxygen (A/F) sensor compensation
coefficient
Not in limit value
Battery voltage
t 10.9 V
Engine coolant temperature
t 75 °C (167 °F)
Amount of intake air
t 10 g/s (0.35 oz/s)
Low (2)
Secondary air system
Not in operation
Closed loop control at the oxygen sensor In operation
Misfire detection every 200 rotations
< 7 time(s)
Front oxygen (A/F) sensor compensation
coefficient
Not in limit value
Battery voltage
t 10.9 V
Engine coolant temperature
t 75 °C (167 °F)
Amount of intake air
< 10 g/s (0.35 oz/s)
Current continuation time of the rear oxy-
gen sensor heater
t 25000 ms
Low (3)
Secondary air system
Not in operation
Closed loop control at the oxygen sensor In operation
Misfire detection every 200 rotations
< 7 time(s)
Front oxygen (A/F) sensor compensation
coefficient
Not in limit value
Battery voltage
t 10.9 V
Engine coolant temperature
t 75 °C (167 °F)
Amount of intake air
< 10 g/s (0.35 oz/s)
Current continuation time of the rear oxy-
gen sensor heater
t 25000 ms
Fuel cut
Experienced
Used for normality judgment
Secondary Parameters
Enable Conditions
Secondary air system
Not in operation
Closed loop control at the oxygen sensor In operation
Misfire detection every 200 rotations
< 7 time(s)
Front oxygen (A/F) sensor compensation
coefficient
Not in limit value
Battery voltage
t 10.9 V
Engine coolant temperature
t 75 °C (167 °F)
GD(H6DO)-62
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
4. GENERAL DRIVING CYCLE
After starting the engine, continuously perform the diagnosis with the same engine condition.
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis:
High: 2500 ms
Low (1): 20000 ms
Low (2): 40000 ms
Low (3): Value from Map
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Time Needed for Diagnosis:
High: Less than 1 second
Low (1): Less than 1 second
Low (2): Less than 1 second
Low (3): Less than 1 second
Judgement Value
Malfunction Criteria
Threshold Value
DTC
High
P0138
Sensor output voltage
> 1.200 V
P0158
Low
P0137
Sensor output voltage
< 0.030 V
P0157
Map
Fuel Cut Time (second)
0
2000
10000
Time needed for diagnosis (second)
40000
40000
60000
Judgement Value
Malfunction Criteria
Threshold Value
DTC
High
P0138
Sensor output voltage
d 1.200 V
P0158
Low
P0137
Sensor output voltage
t 0.030 V
P0157
GD(H6DO)-63
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AP:DTC P0138 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P0137. <Ref. to GD(H6DO)-60, DTC P0137 O2 SENSOR CIRCUIT
LOW VOLTAGE (BANK 1 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Criteria.>
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