Subaru Legacy IV (2008 year). Manual - part 625

 

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Subaru Legacy IV (2008 year). Manual - part 625

 

 

GD(H6DO)-120

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

Mode D: (Measure amount of negative pressure change)
Monitor the tank pressure change amount when using mode D. In this case, the tank pressure increases,
(nears barometric pressure) because evaporation occurs. However, if any leakage exists, the pressure in-
creases additionally in proportion to this leakage. The pressure variation of this tank is P2.
After calculating P2, perform a small leak diagnosis according to the items below.
When Mode D is ended
Assign tank variations measured in Mode A and Mode D, P1 and P2, to the formula below, judge small leaks
in the system. If the measured judgment value exceeds the threshold value, it is judged to be a malfunction.
Abnormality Judgement
Judge as NG when the following conditions are established within the predetermined time. Judge as OK and
clear the NG if the following conditions are not established within the predetermined time.

*1.5 –: Evaporation amount compensation value when below negative pressure (Amount of evaporation occurrence increases as
a vacuum condition increases.)

Time Needed for Diagnosis: 0 ms + 3000 ms + 10000 ms + 10000 ms + 25000 ms + 17000 ms + 10000 ms
Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cy-
cles.

Judgement Value

Malfunction Criteria

Threshold Value

DTC

P2 – 1.5 – × P1

> Value of Map 5

P0442

P2: Tank pressure that changes every 
10000 ms in mode D

P1: Tank pressure that changes every 
10000 ms in mode A

Map 5 Malfunction criteria limit for evaporation diagnosis

Fuel temperature vs. Fuel level

25 °C (77 °F)

30 °C (86 °F)

35 °C (95 °F) 40 °C (104 °F) 45 °C (113 °F)

0

2 (0 US gal, 0 Imp gal)

0.3 kPa 

(2.1 mmHg, 

0.1 inHg)

0.3 kPa 

(2.2 mmHg, 

0.1 inHg)

0.3 kPa 

(2.3 mmHg, 

0.1 inHg)

0.3 kPa 

(2.35 mmHg, 

0.1 inHg)

0.3 kPa 

(2.4 mmHg, 

0.1 inHg)

10

2 (2.64 US gal, 2.2 Imp gal)

0.3 kPa 

(2.1 mmHg, 

0.1 inHg)

0.3 kPa 

(2.2 mmHg, 

0.1 inHg)

0.3 kPa 

(2.3 mmHg, 

0.1 inHg)

0.3 kPa 

(2.35 mmHg, 

0.1 inHg)

0.3 kPa 

(2.4 mmHg, 

0.1 inHg)

20

2 (5.28 US gal, 4.4 Imp gal)

0.3 kPa 

(2.3 mmHg, 

0.1 inHg)

0.3 kPa 

(2.4 mmHg, 

0.1 inHg)

0.3 kPa 

(2.5 mmHg, 

0.1 inHg)

0.3 kPa 

(2.6 mmHg, 

0.1 inHg)

0.4 kPa 

(2.7 mmHg, 

0.1 inHg)

30

2 (7.93 US gal, 6.6 Imp gal)

0.4 kPa 

(2.9 mmHg, 

0.1 inHg)

0.4 kPa 

(3.05 mmHg, 

0.1 inHg)

0.4 kPa 

(3.15 mmHg, 

0.1 inHg)

0.4 kPa 

(3.25 mmHg, 

0.1 inHg)

0.4 kPa 

(3.35 mmHg, 

0.1 inHg)

40

2 (10.57 US gal, 8.8 Imp gal)

0.4 kPa 

(2.9 mmHg, 

0.1 inHg)

0.4 kPa 

(3.15 mmHg, 

0.1 inHg)

0.4 kPa 

(3.3 mmHg, 

0.1 inHg)

0.5 kPa 

(3.4 mmHg, 

0.1 inHg)

0.5 kPa 

(3.5 mmHg, 

0.1 inHg)

50

2 (13.21 US gal, 11 Imp gal)

0.4 kPa 

(3.2 mmHg, 

0.1 inHg)

0.4 kPa 

(3.3 mmHg, 

0.1 inHg)

0.5 kPa 

(3.5 mmHg, 

0.1 inHg)

0.5 kPa 

(3.6 mmHg, 

0.1 inHg)

0.5 kPa 

(3.7 mmHg, 

0.1 inHg)

60 

2 (15.85 US gal, 13.2 Imp gal)

0.4 kPa 

(3.2 mmHg, 

0.1 inHg)

0.4 kPa 

(3.3 mmHg, 

0.1 inHg)

0.5 kPa 

(3.5 mmHg, 

0.1 inHg)

0.5 kPa 

(3.6 mmHg, 

0.1 inHg)

0.5 kPa 

(3.7 mmHg, 

0.1 inHg)

GD(H6DO)-121

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(H6DO)-122

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(H6DO)-123

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)

 

 

 

 

 

 

 

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