Subaru Legacy IV (2008 year). Service manual — part 628
GD(H6DO)-132
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CI: DTC P0453 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE
SENSOR HIGH INPUT
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of the fuel tank pressure sensor.
Judge as NG if out of specification.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform the diagnosis when purging enable conditions are met without idling.
(A)
Output voltage
(B)
Input voltage
(C)
To fuel tank
(1)
Connector
(2)
Terminals
Secondary Parameters
Enable Conditions
Time needed for all secondary parame-
ters to be in enable conditions
t 5000 ms
Vehicle speed
t 2 km/h (1.2 MPH)
All conditions of EVAP canister purge
Completed
Learning value of evaporation gas con-
centration (left and right)
< 0.08
Main feedback compensation coefficient
(left and right)
t 0.9
Battery voltage
t 10.9 V
EN-04462
(A)
(B)
(2)
(1)
(C)
GD(H6DO)-133
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
CJ: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(H6DO)-108, DTC P0442 EVAPORATIVE
EMISSION CONTROL SYSTEM LEAK DETECTED (SMALL LEAK), Diagnostic Trouble Code (DTC) De-
tecting Criteria.>
CK:DTC P0457 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED
(FUEL CAP LOOSE/OFF)
1. OUTLINE OF DIAGNOSIS
For the detection standard, refer to DTC P0442. <Ref. to GD(H6DO)-108, 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 8 kPa (59.85 mmHg,
2.4 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
< 8 kPa (59.85 mmHg,
2.4 inHg)
GD(H6DO)-134
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CL: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.
(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
(A)
(B)
EN-02197
GD(H6DO)-135
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: 2500 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
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
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