Subaru Legacy IV (2008 year). Service manual — part 201
GD(H4SO)-106
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
When B < C (solenoid OFF)
When Solenoid is ON
(a)
Barometric pressure
(b)
Fuel tank
(c)
Canister
(1)
Valve
(a)
Barometric pressure
(b)
Fuel tank
(c)
Canister
EN-01718
A
B
C
(a)
(b)
(c)
(1)
EN-01719
A
B
C
(a)
(b)
(c)
GD(H4SO)-107
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Drain valve
Drain valve controls the ambient air to be introduced to the canister.
3. ENABLE CONDITION
0.04-inch Diagnosis
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg, 22.2 inHg)
Total time of canister purge operation
t 120000 ms
Elapsed time after starting the engine
t 856 s
Learning value of evaporation gas density
< 0.08
Engine speed
1050 rpm — 6000 rpm
Fuel tank pressure
t –4 kPa (–30 mmHg, –1.2 inHg)
Intake manifold relative vacuum (relative pressure)
t – 26.7 kPa (– 200 mmHg, – 7.9 inHg)
Vehicle speed
t 32 km/h (19.9 MPH)
Fuel level
9.6
2 (2.54 US gal, 2.11 Imp gal) — 54.4 2 (14.37 US gal,
11.97 Imp gal)
Closed air/fuel ratio control
In operation
Fuel temperature
–10 °C (14 °F) — 45 °C (113 °F)
Intake air temperature
t –10 °C (14 °F)
Pressure change every one second
< 1.7 mmHg (Mode A)
< 1.7 mmHg (Mode D)
Minimum pressure change value every one sec-
ond – Maximum pressure change value every
one second
< 1.7 mmHg (Mode A)
< 1.7 mmHg (Mode D)
Change of fuel level per 128 milliseconds
< 2
2 (0.53 US gal, 0.44 Imp gal)
Air fuel ratio
0.76 — 1.25
EN-02293
GD(H4SO)-108
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
0.02-inch Diagnosis
4. GENERAL DRIVING CYCLE
0.04-inch Diagnosis
• Perform the diagnosis only once in 856 seconds or more after starting the engine, at a constant speed of
32 km/h (20 MPH) or more.
• Pay attention to the fuel temperature and fuel level.
0.02-inch Diagnosis
• Perform the diagnosis 125 seconds or more at a constant engine speed of 50 km/h (31 MPH) or higher to
judge as NG or OK.
• If judgement cannot be made, repeat the diagnosis.
• Pay attention to the fuel level.
Secondary Parameters
Enable Conditions
At starting a diagnosis
Evap. diagnosis
Incomplete
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg, 22.2 inHg)
Time since last incomplete 0.02-inch leakage
diagnosis
When cancelling in mode A
> 120000 ms
When cancelling in other than mode A
> 600000 ms
Total time of canister purge operation
t 120000 ms
Elapsed time after starting the engine
t 120 s
Fuel temperature
–10 °C (14 °F) — 55 °C (131 °F)
Fuel level
9.6
2 (2.54 US gal, 2.11 Imp gal) — 54.4 2 (14.37 US gal,
11.97 Imp gal)
Intake manifold relative vacuum (relative pressure)
t – 8 kPa (– 60 mmHg, – 2.4 inHg)
Fuel tank pressure
–0.7 kPa (–5 mmHg, –0.2 inHg) — 1.4 kPa (10.7 mmHg,
0.4 inHg)
Vehicle speed
50 km/h (31.1 MPH) — 510 km/h (316.9 MPH) contin-
ues for 125000 ms
Closed air/fuel ratio control
In operation
Engine speed
1050 rpm — 6000 rpm
During diagnosis
Change of fuel level
d Value of Map 4
Pressure change every one second
< 0.1 kPa (0.44 mmHg, 0 inHg)
Minimum pressure change value every one sec-
ond – Maximum pressure change value every
one second
< 0.1 kPa (0.51 mmHg, 0 inHg) (Mode D)
| Pressure change in tank every second |
d 0.1 kPa (0.75 mmHg, 0 inHg)
Barometric pressure change
–0.5 kPa (–3.6 mmHg, –0.1 inHg) — 0.3 kPa (2.4 mmHg,
0.1 inHg) (Mode D)
–0.3 kPa (–2.4 mmHg, –0.1 inHg) — 0.3 kPa (2.4 mmHg,
0.1 inHg) (Mode E)
Map4
Fuel level (
2, US gal, Imp gal)
0
10, 2.64,
2.2
20, 5.28,
4.4
30, 7.93,
6.6
40, 10.57,
8.8
50, 13.21,
11
60, 15.85,
13.2
Change (
2, US gal, Imp gal)
5, 1.32, 1.1
5, 1.32, 1.1
5, 1.32, 1.1
5, 1.32, 1.1
5, 1.32, 1.1
5, 1.32, 1.1
5, 1.32, 1.1
GD(H4SO)-109
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
Purge control solenoid valve stuck open fault diagnosis
DTC
P0457 Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
Purpose of Mode Z
When performing the leakage diagnosis of EVAP system, the purge control solenoid valve must operate nor-
mally. Therefore, mode Z is used to diagnose the purge control solenoid valve stuck open condition. Note
that if a purge control solenoid valve stuck open fault is detected, the EVAP system leakage diagnosis is can-
celled.
Diagnostic method
Purge control solenoid valve functional diagnosis is performed by monitoring the tank pressure in mode Z.
• Abnormality Judgement
If OK judgment cannot be made, extend Mode Z, and Judge as NG when the following conditions are estab-
lished after predetermined amount of time.
Time Needed for Diagnosis: 0 ms + 3000 ms + 13000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
When judgment for purge control solenoid valve stuck open NG is made, end the evaporative diagnosis.
Cancel the evaporative diagnosis when the OK/NG judgment for purge control solenoid valve stuck open
cannot be made in Mode Z.
• Normality Judgement
Judge as OK and change to Mode A when the following conditions are established after predetermined time
has passed since Mode Z started.
Judgement Value
Malfunction Criteria
Threshold Value
DTC
evptez – evptezha
> 0.9 kPa (6.5 mmHg,
0.3 inHg)
P0457
evptezini
d 1.4 kPa (10.7 mmHg,
0.4 inHg)
Time of 2
2 (0.53 US gal, 0.44 Imp gal)
or more fuel no sloshing
t 40000 ms
Judgement Value
Malfunction Criteria
Threshold Value
DTC
evptez – evptezha
d 0.4 kPa (3 mmHg,
0.1 inHg)
P0457
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