Subaru Legacy IV (2008 year). Manual - part 417

 

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Subaru Legacy IV (2008 year). Manual - part 417

 

 

GD(H4DOTC)-118

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

Purge control solenoid valve Open Fixation

• evptezini 

d 1.4 kPa (10.7 mmHg, 0.4 inHg)

• evptez – evptezha > 0.6 kPa (4.5 mmHg, 0.2 inHg)
• No fuel sloshing of over 2 

2 (0.53 US gal, 0.44 Imp gal) lasts for more than 40000 ms.

Judge as abnormal when all are established.

(1)

Mode Z

(4)

Fuel tank pressure

(7)

40000 ms no fuel sloshing

(2)

Extended mode Z

(5)

0.6 kPa (4.5 mmHg, 0.2 inHg)

(8)

NG judgement

(3)

3000 ms + 13000 ms

(6)

1.4 kPa (10.7 mmHg, 0.4 inHg)

 

 

EN-02870

(8)

(7)

(6)

(4)

(5)

evptez

evptezini

evptezha

0

(3)

(2)

(1)

GD(H4DOTC)-119

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

Leak Diagnosis

DTC
P0441 Evaporative emission system incorrect purge flow
P0442 Evaporative Emission Control System Leak Detected (Small Leak)
P0457 Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
• 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: (Estimated evaporation gas amount)
Calculate the tank pressure change amount (P1) when using mode A. After calculating P1, switch to mode B.
Mode B: (Negative pressure sealed)
Introduce negative pressure in the intake manifold to the tank.
Approx. 0 

o –1.4 kPa (0 o –10.5 mmHg, 0 o –0.4 inHg)

When the pressure above (desired negative pressure) is reached, enters Mode C.
In this case, if the tank pressure does not reach the target negative pressure, judge that there is a large leak-
age in the system and terminate the evaporative emission control system diagnosis.
Abnormality Judgement
Judge as NG (large leakage) when the following conditions are established.

Time Needed for Diagnosis: 0 ms + 3000 ms + 10000 ms + 10000 ms + 25000 ms
Mode C: (Check pressure rise)
Stop the introduction of negative pressure. (Wait until the tank pressure returns to the start level of P2 cal-
culation.)
Change to Mode D when the tank pressure returns to the start level of P2 calculation.
Judge immediate OK and change to Mode E when it does not return in spite of spending the specified time.

Time Needed for Diagnosis: 0 ms + 3000 ms + 10000 ms + 10000 ms + 25000 ms + 17000 ms
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 judgement value exceeds the threshold value, it is judged to be a malfunction.

Judgement Value

Malfunction Criteria

Threshold Value

DTC

Time to reach target negative pressure

t 10000 ms + 25000 ms P0457

or

  

Mode B time

t 10000 ms

 

(Min. pressure value in tank when in 
mode B) – (Tank pressure when mode B 
started)

> –0.3 kPa (–2.5 mmHg, 
–0.1 inHg)

Tank pressure when starting cal-

culation of P2

Time for advanced OK 

judgement

–1.3 kPa (–9.75 mmHg, –0.4 inHg) 17000 ms

GD(H4DOTC)-120

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

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.)

Purge control solenoid valve 2 stuck close diagnosis
Perform purge control solenoid valve 2 stuck close diagnosis using the variation gap between the tank pres-
sure at the end of mode C and after mode C.

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)

Malfunction Criteria

Threshold Value

DTC

Elapsed time after completion of mode C 
advanced OK judgement

= 3500 ms

P0441

Tank pressure variation after completion 
of mode C advanced OK judgement

< 0.758 mmHg

 

GD(H4DOTC)-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 vacuum 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 judgement or cancel the diagnosis.
Normality Judgement
Judge as OK when the following conditions are established.
Judgement Value

Malfunction Criteria

Threshold Value

Advanced OK judgement 1

Mode D time

t 0 ms + 20000 ms

Tank internal pressure

d Value of Map 6

Advanced OK judgement 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

 

 

 

 

 

 

 

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