Subaru IMPREZA GD 2007 Series Manual page 2207

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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 Judgment
Judge as NG when the criteria below are met and judge as OK when not met, and clear NG.
Judgment Value
Malfunction Criteria
P2 – 1.5 × P1
P2: Tank pressure that changes every 16
seconds in mode D
P1: Tank pressure that changes every 16
seconds in mode A
* 1.5: Evaporation amount compensation value when below negative pressure (Amount of evaporation occurrence increases as
a vacuum condition increases.)
Map 2 Malfunction criteria limit for evaporation diagnosis
Fuel temperature vs. Fuel level
0 L (0 US gal, 0 Imp gal)
10 L (2.64 US gal, 2.2 Imp gal)
20 L (5.28 US gal, 4.4 Imp gal)
30 L (7.93 US gal, 6.6 Imp gal)
40 L (10.57 US gal, 8.8 Imp gal)
50 L (13.21 US gal, 11.0 Imp gal)
60 L (15.85 US gal, 13.2 Imp gal)
Time Needed for Diagnosis: 30 — 100 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
Threshold Value DTC
> Value from Map 2 P0442
* Threshold value:
Map (Remaining Fuel
vs Tank temperature)
5°C (41°F) 15°C (59°F) 25°C (77°F)
0.49 kPa 0.49 kPa 0.53 kPa
(3.68 mmHg, (3.68 mmHg, (3.95 mmHg,
0.14 inHg) 0.14 inHg) 0.16 inHg)
0.49 kPa 0.49 kPa 0.53 kPa
(3.68 mmHg, (3.68 mmHg, (3.95 mmHg,
0.14 inHg) 0.14 inHg) 0.16 inHg)
0.50 kPa 0.51 kPa 0.53 kPa
(3.77 mmHg, (3.79 mmHg, (4.01 mmHg,
0.15 inHg) 0.15 inHg) 0.16 inHg)
0.51 kPa 0.52 kPa (3.9 0.54 kPa
(3.85 mmHg, mmHg, 0.15 (4.06 mmHg,
0.15 inHg) inHg) 0.16 inHg)
0.65 kPa 0.65 kPa (4.9 0.66 kPa
(4.88 mmHg, mmHg, 0.19 (4.98 mmHg,
0.19 inHg) inHg) 0.20 inHg)
0.794 kPa 0.794 kPa 0.794 kPa
(5.96 mmHg, (5.96 mmHg, (5.96 mmHg,
0.235 inHg) 0.235 inHg) 0.235 inHg)
0.794 kPa 0.794 kPa 0.794 kPa
(5.96 mmHg, (5.96 mmHg, (5.96 mmHg,
0.235 inHg) 0.235 inHg) 0.235 inHg)
GD(STI)-140
35°C (95°F) 45°C (113°F)
0.54 kPa 0.56 kPa
(4.07 mmHg, (4.17 mmHg,
0.16 inHg) 0.16 inHg)
0.54 kPa 0.56 kPa
(4.07 mmHg, (4.17 mmHg,
0.16 inHg) 0.16 inHg)
0.56 kPa 0.57 kPa
(4.17 mmHg, (4.27 mmHg,
0.16 inHg) 0.17 inHg)
0.57 kPa 0.60 kPa
(4.27 mmHg, (4.48 mmHg,
0.17 inHg) 0.18 inHg)
0.71 kPa 0.76 kPa
(5.32 mmHg, (5.73 mmHg,
0.21 inHg) 0.23 inHg)
0.85 kPa 0.88 kPa (6.6
(6.38 mmHg, mmHg, 0.26
0.25 inHg) inHg)
0.85 kPa 0.88 kPa
(6.38 mmHg, (6.6 mmHg,
0.25 inHg) 0.26 inHg)