Subaru Legacy IV (2008 year). Service manual — part 203
GD(H4SO)-114
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Leak Diagnosis
DTC
P0456 Evaporative Emission Control System Leak Detected (very small leak)
• The diagnostic consists of creating a sealed vacuum in the fuel tank and then determining the presence of
leakage from the speed at which the tank internal pressure returns to barometric pressure.
• The diagnosis is divided into the following five phases.
Mode A: (0 point compensation)
When the pressure in the tank is not near 0 mmHg, wait until it returns to 0 point (near 0 mmHg). Shift to mode
B when returned to the 0 point. Cancel the diagnosis when 0 point does not return in the specified time.
Mode B: (Negative pressure introduced)
Introduce negative pressure in the intake manifold to the tank.
Approx. 0
o –2 kPa (0 o –15 mmHg, 0 o –0.6 inHg)
When the pressure above (desired negative pressure) is reached, enters Mode C.
When the tank internal pressure does not reach the target negative pressure, the diagnosis is cancelled.
Mode C: (Negative pressure maintained)
Stop the introduction of negative pressure. (Wait until the tank pressure returns to the start level of P2 cal-
culation.)
Change to Mode D either when the tank pressure returns to the start level of P2 calculation, or when the pre-
determined amount of time has passed.
Mode D: (Calculate the amount of negative pressure change)
Monitor the tank pressure in mode D, calculate (P2) the pressure change in the tank, and measure the time
(evpdset) for the tank pressure to change to the Mode E shifting pressure. When the Mode E shifting pres-
sure is reached, Mode E is entered. If it does not change to the Mode E shifting pressure after the predeter-
mined amount of time has passed, make advanced OK judgment or cancel the diagnosis.
Normality Judgement
Judge as OK when the following conditions are established.
Judgement Value
Malfunction Criteria
Threshold Value
Advanced OK judgment 1
Mode D time
t 0 ms + 20000 ms
Tank internal pressure
d Value of Map 6
Advanced OK judgment 2
Mode D time
t 0 ms + 200000 ms
P2
d Value of Map 7
Map6
Fuel level (
2, US gal, Imp gal)
0, 0, 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
Tank pressure (kPa, mmHg, inHgl)
–1.9, –13.9,
–0.5
–1.9, –13.9,
–0.5
–1.8, –13.8,
–0.5
–1.8, –13.7,
–0.5
–1.8, –13.6,
–0.5
–1.8, –13.5,
–0.5
–1.8, –13.5,
–0.5
Map7
Fuel level (
2, US gal, Imp gal)
0, 0, 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
Tank pressure (kPa, mmHg, inHgl)
0.9, 7, 0.3
0.9, 7, 0.3
0.9, 7.05,
0.3
0.9, 7.1,
0.3
1.1, 8.2,
0.3
1.3, 9.6,
0.4
1.3, 9.6,
0.4
GD(H4SO)-115
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Mode E: (Evaporation occurrence amount calculation)
Calculate the change of tank pressure with the time evpdset to judge as NG/OK according to the value of P1.
(ambiguous determination acceptable).
• Abnormality Judgement
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: Value of Map1 + Value of Map2 + 20000 ms + 0 + Value of Map2 + 0 ms +
200000 ms + Value of Map3 + 0 ms + 200000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
Judgement Value
Malfunction Criteria
Threshold Value
P1
< Value of Map 8
Map 8 Malfunction criteria limit for evaporation diagnosis
Time (evpdset) vs. Fuel level
0 ms
30000 ms
50000 ms
100000 ms
160000 ms
200000 ms
0
2 (0 US gal, 0 Imp gal)
0 kPa
(0 mmHg, 0
inHg)
0.1 kPa
(0.5 mmHg,
0 inHg)
0.2 kPa
(1.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
10
2 (2.64 US gal, 2.2 Imp gal)
0 kPa
(0 mmHg,
0 inHg)
0.1 kPa
(0.5 mmHg,
0 inHg)
0.2 kPa
(1.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
20
2 (5.28 US gal, 4.4 Imp gal)
0 kPa
(0 mmHg,
0 inHg)
0.1 kPa
(0.5 mmHg,
0 inHg)
0.2 kPa
(1.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
30
2 (7.93 US gal, 6.6 Imp gal)
0 kPa
(0 mmHg,
0 inHg)
0.1 kPa
(0.5 mmHg,
0 inHg)
0.2 kPa
(1.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
0.4 kPa
(2.7 mmHg,
0.1 inHg)
40
2 (10.57 US gal, 8.8 Imp gal)
0 kPa
(0 mmHg,
0 inHg)
0.1 kPa
(0.5 mmHg,
0 inHg)
0.2 kPa
(1.85 mmHg,
0.1 inHg)
0.3 kPa
(2.5 mmHg,
0.1 inHg)
0.3 kPa
(2.5 mmHg,
0.1 inHg)
0.3 kPa
(2.5 mmHg,
0.1 inHg)
50
2 (13.21 US gal, 11 Imp gal)
0 kPa
(0 mmHg,
0 inHg)
0.1 kPa
(0.5 mmHg,
0 inHg)
0.3 kPa
(2 mmHg,
0.1 inHg)
0.3 kPa
(2.3 mmHg,
0.1 inHg)
0.3 kPa
(2.3 mmHg,
0.1 inHg)
0 kPa
(0 mmHg,
0 inHg)
60
2 (15.85 US gal, 13.2 Imp gal)
0 kPa
(0 mmHg,
0 inHg)
0.1 kPa
(0.5 mmHg,
0 inHg)
0.3 kPa
(2 mmHg,
0.1 inHg)
0.3 kPa
(2.3 mmHg,
0.1 inHg)
0.3 kPa
(2.3 mmHg,
0.1 inHg)
0 kPa
(0 mmHg,
0 inHg)
GD(H4SO)-116
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
• Normality Judgement
Judge as OK when the following conditions are established.
Time Needed for Diagnosis: Value of Map1 + Value of Map2 + 20000 ms + 0 + Value of Map2 + 0 ms +
200000 ms + Value of Map3 + 0 ms + 200000 ms
Judgement Value
Malfunction Criteria
Threshold Value
P1
> Value of Map 9
Map 9 Malfunction criteria limit for evaporation diagnosis
Time (evpdset) vs. Fuel level
0 ms
30000 ms
50000 ms
100000 ms
160000 ms
200000 ms
0
2 (0 US gal, 0 Imp gal)
0.1 kPa
(1 mmHg,
0 inHg)
0.5 kPa
(3.5 mmHg,
0.1 inHg)
0.6 kPa
(4.2 mmHg,
0.2 inHg)
0.6 kPa
(4.2 mmHg,
0.2 inHg)
0.6 kPa
(4.2 mmHg,
0.2 inHg)
0.6 kPa
(4.2 mmHg,
0.2 inHg)
10
2 (2.64 US gal, 2.2 Imp gal)
0.1 kPa
(1 mmHg,
0 inHg)
0.5 kPa
(3.5 mmHg,
0.1 inHg)
0.6 kPa
(4.2 mmHg,
0.2 inHg)
0.6 kPa
(4.2 mmHg,
0.2 inHg)
0.6 kPa
(4.2 mmHg,
0.2 inHg)
0.6 kPa
(4.2 mmHg,
0.2 inHg)
20
2 (5.28 US gal, 4.4 Imp gal)
0.1 kPa
(1 mmHg,
0 inHg)
0.4 kPa
(3.25 mmHg,
0.1 inHg)
0.5 kPa
(4.1 mmHg,
0.2 inHg)
0.5 kPa
(4.1 mmHg,
0.2 inHg)
0.5 kPa
(4.1 mmHg,
0.2 inHg)
0.5 kPa
(4.1 mmHg,
0.2 inHg)
30
2 (7.93 US gal, 6.6 Imp gal)
0.1 kPa
(1 mmHg,
0 inHg)
0.4 kPa
(3 mmHg,
0.1 inHg)
0.5 kPa
(3.9 mmHg,
0.2 inHg)
0.5 kPa
(3.9 mmHg,
0.2 inHg)
0.5 kPa
(3.9 mmHg,
0.2 inHg)
0.5 kPa
(3.9 mmHg,
0.2 inHg)
40
2 (10.57 US gal, 8.8 Imp gal)
0.1 kPa
(1 mmHg,
0 inHg)
0.3 kPa
(2.25 mmHg,
0.1 inHg)
0.5 kPa
(3.4 mmHg,
0.1 inHg)
0.5 kPa
(3.4 mmHg,
0.1 inHg)
0.5 kPa
(3.4 mmHg,
0.1 inHg)
0.5 kPa
(3.4 mmHg,
0.1 inHg)
50
2 (13.21 US gal, 11 Imp gal)
0.1 kPa
(1 mmHg,
0 inHg)
0.2 kPa
(1.5 mmHg,
0.1 inHg)
0.4 kPa
(2.9 mmHg,
0.1 inHg)
0.4 kPa
(2.9 mmHg,
0.1 inHg)
0.4 kPa
(2.9 mmHg,
0.1 inHg)
0.4 kPa
(2.9 mmHg,
0.1 inHg)
60
2 (15.85 US gal, 13.2 Imp gal)
0.1 kPa
(1 mmHg,
0 inHg)
0.2 kPa
(1.5 mmHg,
0.1 inHg)
0.4 kPa
(2.9 mmHg,
0.1 inHg)
0.4 kPa
(2.9 mmHg,
0.1 inHg)
0.4 kPa
(2.9 mmHg,
0.1 inHg)
0.4 kPa
(2.9 mmHg,
0.1 inHg)
GD(H4SO)-117
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BG:DTC P0447 EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL
CIRCUIT OPEN
1. OUTLINE OF DIAGNOSIS
Detect open or short circuit of the drain 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 continuously.
(1)
Bobbin
(8)
Magnetic plate
(14)
Retainer
(2)
Coil
(9)
Shaft
(15)
Diaphragm
(3)
Diode
(10)
Plate
(16)
Movable core
(4)
Stator core
(11)
Valve
(17)
Spring
(5)
End plate
(12)
Housing
(18)
Cover
(6)
Body
(13)
Filter
(19)
O-ring
(7)
Yoke
Secondary Parameters
Enable Conditions
None
EN-02294
( 1 )
( 2 )
( 3 )
( 4 )
( 5 )
( 6 )
( 7 )
( 8 )
( 9 )
(10)
(11)
(12)
(13)
(17)
(14)
(15)
(16)
(18)
(19)
(19)
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