Subaru Legacy IV (2008 year). Service manual — part 206
GD(H4SO)-126
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
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: 15000 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• 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
BL:DTC P0456 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED
(VERY SMALL LEAK)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P0442. <Ref. to GD(H4SO)-101, DTC P0442 EVAPORATIVE
EMISSION CONTROL SYSTEM LEAK DETECTED (SMALL LEAK), Diagnostic Trouble Code (DTC) De-
tecting Criteria.>
BM:DTC P0457 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED
(FUEL CAP LOOSE/OFF)
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P0442. <Ref. to GD(H4SO)-101, DTC P0442 EVAPORATIVE
EMISSION CONTROL SYSTEM LEAK DETECTED (SMALL LEAK), Diagnostic Trouble Code (DTC) De-
tecting Criteria.>
Judgement Value
Malfunction Criteria
Threshold Value
Fuel tank pressure
t 7.9 kPa (59.6 mmHg,
2.3 inHg)
Fuel temperature
< 35 °C (95 °F)
Barometric pressure
t 75 kPa (563 mmHg,
22.2 inHg)
Judgement Value
Malfunction Criteria
Threshold Value
Fuel tank pressure
< 7.9 kPa (59.6 mmHg,
2.3 inHg)
GD(H4SO)-127
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BN:DTC P0458 EVAPORATIVE EMISSION SYSTEM PURGE CONTROL VALVE
CIRCUIT LOW
1. OUTLINE OF DIAGNOSIS
Detect open or short circuit of the purge control solenoid valve.
Judge as NG when the ECM output level differs from the actual terminal level.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis after starting the engine.
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: 2500 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
• 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
(A)
To canister
(B)
To intake manifold
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Elapsed time after starting the engine
t 1 second
Judgement Value
Malfunction Criteria
Threshold Value
Duty ratio of “ON”
< 0.75
Terminal output voltage
Low
Judgement Value
Malfunction Criteria
Threshold Value
Terminal output voltage
High
(A)
(B)
EN-02197
GD(H4SO)-128
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BO:DTC P0459 EVAPORATIVE EMISSION SYSTEM PURGE CONTROL VALVE
CIRCUIT HIGH
1. OUTLINE OF DIAGNOSIS
Detect open or short circuit of the purge control solenoid valve.
Judge as NG when the ECM output level differs from the actual terminal level.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis after starting the engine.
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: 2500 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
• 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
(A)
To canister
(B)
To intake manifold
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Elapsed time after starting the engine
t 1 second
Judgement Value
Malfunction Criteria
Threshold Value
Duty ratio of “ON”
t 0.25
Terminal output voltage
High
Judgement Value
Malfunction Criteria
Threshold Value
Terminal output voltage
Low
(A)
(B)
EN-02197
GD(H4SO)-129
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BP:DTC P0461 FUEL LEVEL SENSOR “A” CIRCUIT RANGE/PERFORMANCE
1. OUTLINE OF DIAGNOSIS
Detect malfunctions of the fuel level sensor output property.
If the fuel level does not vary in a particular driving condition / engine condition where it should, judge as NG.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(A)
Fuel level
(B)
Resistance
Secondary Parameters
Enable Conditions
None
EN-01734
0
(B)
(A)
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