Subaru Legacy IV (2008 year). Service manual — part 429
GD(H4DOTC)-166
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CO:DTC P1152 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (LOW)
(BANK1 SENSOR1)
1. OUTLINE OF DIAGNOSIS
Detect that
O value remains low.
Judge as NG when lambda value is abnormal in accordance with
O value of front oxygen (A/F) sensor and
running conditions such as vehicle speed, amount of intake air, engine coolant temperature, sub feedback
control, etc.
2. COMPONENT DESCRIPTION
O value = Actual air fuel ratio/Theoretical air fuel ratio
O > 1: Lean
O < 1: Rich
(A)
Electromotive force
(C)
Lean
(D)
Rich
(B)
Air fuel ratio
(1)
Atmosphere
(3)
ZrO
2
(4)
Ceramic heater
(2)
Exhaust gas
(1)
(2)
(4)
(2)
(3)
EN-01693
(C)
(B)
(D)
(A)
GD(H4DOTC)-167
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform diagnosis continuously at a constant speed of 20 km/h (12.4 MPH) or more after 60000 ms have
passed since the engine started.
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: 10000 ms
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: Less than 1 second
Secondary Parameters
Enable Conditions
Time needed for all secondary parameters to be in enable
conditions
t 4096 ms
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg, 22.2 inHg)
Rear oxygen sensor sub feedback
Execution
Rear oxygen sensor output voltage – Feedback target voltage
–0.2 V — 0.1 V
or rear oxygen sensor sub feedback compensation coefficient
On Min.
or rear oxygen sensor sub feedback compensation coefficient
On Max.
Elapsed time after starting the engine
t 60000 ms
Engine coolant temperature
t 70 °C (158 °F)
Vehicle speed
t 20 km/h (12.4 MPH)
Amount of intake air
t 6 g/s (0.21 oz/s)
Load change at 180°CA
< 0.02 g/rev (0 oz/rev)
Front oxygen (A/F) sensor impedance
0
: — 50 :
Learning value of evaporation gas density
< 0.2
Total time of operating canister purge
t 19.9 s
Targeted lambda value load compensation coefficient
–1 — 1
Judgement Value
Malfunction Criteria
Threshold Value
O value
< 0.85
Judgement Value
Malfunction Criteria
Threshold Value
O value
t 0.85
GD(H4DOTC)-168
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CP:DTC P1153 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (HIGH)
(BANK1 SENSOR1)
1. OUTLINE OF DIAGNOSIS
Detect that
O value remains high.
Judge as NG when lambda value is abnormal in accordance with
O value of front oxygen (A/F) sensor and
running conditions such as vehicle speed, amount of intake air, engine coolant temperature, sub feedback
control, etc.
2. COMPONENT DESCRIPTION
O value = Actual air fuel ratio/Theoretical air fuel ratio
O > 1: Lean
O < 1: Rich
(A)
Electromotive force
(C)
Lean
(D)
Rich
(B)
Air fuel ratio
(1)
Atmosphere
(3)
ZrO
2
(4)
Ceramic heater
(2)
Exhaust gas
(1)
(2)
(4)
(2)
(3)
EN-01693
(C)
(B)
(D)
(A)
GD(H4DOTC)-169
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform diagnosis continuously at a constant speed of 20 km/h (12.4 MPH) or more after 60000 ms have
passed since the engine started.
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: 10000 ms
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: Less than 1 second
Secondary Parameters
Enable Conditions
Time needed for all secondary parameters to be in enable
conditions
t 4096 ms
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg, 22.2 inHg)
Rear oxygen sensor sub feedback
Execution
Rear oxygen sensor output voltage – Feedback target voltage
–0.2 V — 0.1 V
or rear oxygen sensor sub feedback compensation coefficient
On Min.
or rear oxygen sensor sub feedback compensation coefficient
On Max.
Elapsed time after starting the engine
t 60000 ms
Engine coolant temperature
t 70 °C (158 °F)
Vehicle speed
t 20 km/h (12.4 MPH)
Amount of intake air
t 6 g/s (0.21 oz/s)
Load change at 180°CA
< 0.02 g/rev (0 oz/rev)
Front oxygen (A/F) sensor impedance
0
: — 50 :
Learning value of evaporation gas density
< 0.2
Total time of operating canister purge
t 19.9 s
Targeted lambda value load compensation coefficient
–1 — 1
Judgement Value
Malfunction Criteria
Threshold Value
O value
> 1.15
Judgement Value
Malfunction Criteria
Threshold Value
O value
d 1.15
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