Subaru Legacy IV (2008 year). Service manual — part 623
GD(H6DO)-112
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Valve Operation and Air Flow
In the figure below, divided by the diaphragm, the part above X is charged with atmospheric air pressure, and
the part below X is charged with tank pressure. Also, the part above Y is charged with tank pressure, and the
part below Y is charged with canister pressure.
If the atmospheric air pressure port is A, tank pressure port is B, and canister pressure port is C, the air flows
according to pressure difference from each port as shown in the table below.
When A < B (solenoid OFF)
(a)
Barometric pressure
(b)
Fuel tank
(c)
Canister
Condition of pressure
Flow
A < B (solenoid OFF)
B
o C
B < C (solenoid OFF)
C
o B
Solenoid ON
B
m o C
(a)
Barometric pressure
(b)
Fuel tank
(c)
Canister
EN-01716
A
B
C
X
X
Y
(a)
(b)
(c)
EN-01717
A
B
C
(a)
(b)
(c)
GD(H6DO)-113
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(H6DO)-114
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 — 6500 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(H6DO)-115
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) continues
for 125000 ms
Closed air/fuel ratio control
In operation
Engine speed
1050 rpm — 7000 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
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