Content .. 200 201 202 203 ..

Subaru Legacy IV (2008 year). Manual - part 202

GD(H4SO)-110

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

Normal

evptez – evptezha

d 0.4 kPa (3 mmHg, 0.1 inHg) Normal when above is established

Time Needed for Diagnosis: 0 ms + 3000 ms

(1)

Mode Z

(3)

Fuel tank pressure

(5)

OK judgment

(2)

3000 ms

(4)

0.4 kPa (3 mmHg, 0.1 inHg)

EN-02869

(1)

(2)

(4)

evptez

evptezini

evptezha

(3)

(5)

GD(H4SO)-111

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 > 0.9 kPa (6.5 mmHg, 0.3 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)

0.9 kPa (6.5 mmHg, 0.3 inHg)

(8)

NG judgment

(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

(3)

(2)

(1)

GD(H4SO)-112

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

Leak Diagnosis

DTC
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 + 18500 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 judgment 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

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

judgment

–1.3 kPa (–9.75 mmHg, –0.4 inHg) 18500 ms

GD(H4SO)-113

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.)

Time Needed for Diagnosis: 0 ms + 3000 ms + 10000 ms + 10000 ms + 25000 ms + 18500 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)

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)

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)

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)

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)

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)

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)

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)

Content .. 200 201 202 203 ..