Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 330
GD(H4DOTC)-72
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 5000 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgment
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: Less than 1 second
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Time of heater control duty at 70 % or more
≥ 36000 ms
Front oxygen (A/F) sensor impedance.
> 500 Ω
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Front oxygen (A/F) sensor impedance.
≤ 500 Ω
GD(H4DOTC)-73
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
(B)
Air fuel ratio
(C)
Lean
(D)
Rich
(E)
Theoretical air fuel ratio
(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(H4DOTC)-74
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
After starting the engine, continuously perform the diagnosis with the same engine 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
< 65535 time(s)
Front oxygen (A/F) sensor compensation coefficient
Not in limit value
Battery voltage
≥ 10.9 V
Engine coolant temperature
≥ 70 °C (158 °F)
Low (1)
Secondary air system
Not in operation
Closed loop control at the oxygen sensor
In operation
Misfire detection every 200 rotations
< 65535 time(s)
Front oxygen (A/F) sensor compensation coefficient
Not in limit value
Battery voltage
≥ 10.9 V
Engine coolant temperature
≥ 70 °C (158 °F)
Amount of intake air
≥ 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
< 65535 time(s)
Front oxygen (A/F) sensor compensation coefficient
Not in limit value
Battery voltage
≥ 10.9 V
Engine coolant temperature
≥ 70 °C (158 °F)
Amount of intake air
< 10 g/s (0.35 oz/s)
Current continuation time of the rear oxygen sensor heater
≥ 25000 ms
Low (3)
Secondary air system
Not in operation
Closed loop control at the oxygen sensor
In operation
Misfire detection every 200 rotations
< 65535 time(s)
Front oxygen (A/F) sensor compensation coefficient
Not in limit value
Battery voltage
≥ 10.9 V
Engine coolant temperature
≥ 70 °C (158 °F)
Amount of intake air
< 10 g/s (0.35 oz/s)
Current continuation time of the rear oxygen sensor heater
≥ 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
< 65535 time(s)
Front oxygen (A/F) sensor compensation coefficient
Not in limit value
Battery voltage
≥ 10.9 V
Engine coolant temperature
≥ 70 °C (158 °F)
GD(H4DOTC)-75
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgment
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): 150000 ms
Low (3): Value from Map
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgment
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
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(H4DOTC)-73, DTC P0137 O2 SENSOR CIR-
CUIT LOW VOLTAGE (BANK 1 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Criteria.>
Judgment Value
Malfunction Criteria
Threshold Value
DTC
High
P0138
Sensor output voltage
> 1.2 V
Low
P0137
Sensor output voltage
< 0.03 V
Map
Fuel cut time (s)
0
2000
10000
Time Needed for Diagnosis (s)
150000
150000
150000
Judgment Value
Malfunction Criteria
Threshold Value
DTC
High
P0138
Sensor output voltage
≤ 1.2 V
Low
P0137
Sensor output voltage
≥ 0.03 V
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