Subaru Legacy IV (2008 year). Service manual — part 205
GD(H4SO)-122
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.
If the difference between the Max. fuel level every 60 s and Min. fuel level every 60 s is less than 2
2 (0.53
US gal, 0.44 Imp gal), extend 60 s and make judgement with the Max. and Min. values for the fuel level in 60
s × 2. 60 s If a difference does not appear, extend the time (60 s × 3, 60 s × 4, 60 s × 5) and continue the
judgement. If the difference between the Max. fuel level every 60 s and Min. fuel level every 60 s is 2
2 (0.53
US gal, 0.44 Imp gal) or more, the diagnosis counter counts up.
Time Needed for Diagnosis: 60 s × 16 time(s) or more
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
Number of times that the difference
between the Max. fuel level every 60 s
and Min. fuel level every 60 s is 2
2
(0.53 US gal, 0.44 Imp gal) or more (with
enable condition established)
t 16 time(s)
Maximum – Minimum tank pressure
(with enable condition completed)
< 0 kPa (0.375 mmHg,
0 inHg)
Maximum – Minimum fuel temperature
(with enable condition completed)
t 7 °C (44.6 °F)
Judgement Value
Malfunction Criteria
Threshold Value
Maximum — Minimum tank pressure
t 0 kPa (0.375 mmHg,
0 inHg)
GD(H4SO)-123
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BJ:DTC P0452 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE
SENSOR LOW 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
Always perform the diagnosis continuously.
(A)
Output voltage
(B)
Input voltage
(C)
To fuel tank
(1)
Connector
(2)
Terminals
Secondary Parameters
Enable Conditions
None
EN-04462
(A)
(B)
(2)
(1)
(C)
GD(H4SO)-124
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
Judgement Value
Malfunction Criteria
Threshold Value
Fuel tank pressure
< –7.4 kPa (–55.6 mmHg,
–2.2 inHg)
Battery voltage
t 10.9 V
Judgement Value
Malfunction Criteria
Threshold Value
Fuel tank pressure
t –7.4 kPa (–55.6 mmHg,
–2.2 inHg)
Battery voltage
t 10.9 V
GD(H4SO)-125
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BK: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)
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