Subaru Legacy IV (2008 year). Service manual — part 214
GD(H4SO)-158
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CJ: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(H4SO)-159
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 75 °C (167 °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
–0.03 — 0.000
Judgement Value
Malfunction Criteria
Threshold Value
O value
> 1.15
Judgement Value
Malfunction Criteria
Threshold Value
O value
d 1.15
GD(H4SO)-160
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CK:DTC P1160 RETURN SPRING FAILURE
1. OUTLINE OF DIAGNOSIS
Judge as NG when the valve is opened more than the default opening angle, but does not move to the close
direction with the motor power stopped.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
• Ignition switch ON
o OFF
• Ignition switch OFF
o ON (Only after clearing memory)
5. DIAGNOSTIC METHOD
Judge as OK and clear the NG when the malfunction criteria below are met.
Time Needed for Diagnosis: 1880 milliseconds
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
(1)
Opener spring
(4)
Full closed stopper
(7)
DC motor
(2)
Return spring
(5)
Throttle valve
(8)
Main and sub throttle sensor
(3)
Intermediate stopper
(6)
Gear
Secondary Parameters
Enable Conditions
Motor continuity
OFF
Judgement Value
Malfunction Criteria
Threshold Value
Opening variation after continuity is set
to OFF
t 2°
EN-01866
S S
(8)
(6)
(7)
(5)
(1)
(3)
(2)
(4)
GD(H4SO)-161
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CL:DTC P1400 FUEL TANK PRESSURE CONTROL SOLENOID VALVE CIRCUIT
LOW
1. OUTLINE OF DIAGNOSIS
Detect the open/short circuit of pressure control solenoid valve.
Judge as NG when ECM output level is different from actual terminal level.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis after starting the engine.
(A)
Barometric pressure
(B)
Shut-off valve
(C)
To fuel tank
(1)
Filter
(3)
Connector terminal
(5)
Valve
(2)
Coil
(4)
Diaphragm
Secondary Parameters
Enable Conditions
None
EN-01759
(1)
(2)
(3)
(4)
(5)
(A)
(B)
(C)
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