Subaru LEGACY 2006 Manual page 569

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Map 7 Malfunction criteria limit for evaporation diagnosis
Fuel temperature & Fuel level
10 L (2.6 US gal, 2.2 Imp gal)
20 L (5.3 US gal, 4.4 Imp gal)
30 L (7.9 US gal, 6.6 Imp gal)
40 L (10.6 US gal, 8.8 Imp gal)
50 L (13.2 US gal, 11.0 Imp gal)
Time Needed for Diagnosis: 30 — 100 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
Leak Diagnosis
DTC
P0456 Evaporative Emission Control System Leak Detected (very small leak)
Diagnostic method
• The diagnostic method 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 atmospheric pressure.
• The diagnosis is divided into the following five phases.
Mode A: (0 point compensation)
When the pressure in the tank is high, 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.
Approximately 0 → –2.0 kPa (0 → –15 mmHg, 0 → –0.59 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.
25°C (77°F) 30°C (86°F) 35°C (95°F)
0.28 kPa 0.29 kPa 0.31 kPa
(2.1 mmHg, (2.2 mmHg, (2.3 mmHg,
0.083 inHg) 0.086 inHg) 0.092 inHg)
0.31 kPa 0.32 kPa 0.33 kPa
(2.3 mmHg, (2.4 mmHg, (2.5 mmHg,
0.092 inHg) 0.095 inHg) 0.097 inHg)
0.407 kPa 0.42 kPa
0.39 kPa
(3.05 (3.15
(2.9 mmHg,
mmHg, 0.12 mmHg,
0.115 inHg)
inHg) 0.124 inHg)
0.42 kPa
0.39 kPa 0.44 kPa
(3.15
(2.9 mmHg, (3.3 mmHg,
mmHg,
0.115 inHg) 0.13 inHg)
0.124 inHg)
0.427 kPa 0.44 kPa 0.47 kPa
(3.2 mmHg, (3.3 mmHg, (3.5 mmHg,
0.126 inHg) 0.13 inHg) 0.139 inHg)
GD(H4SO)-132
40°C 45°C
(104°F) (113°F)
0.313 kPa
(2.35 0.32 kPa
mmHg, (2.4 mmHg,
0.0924 0.095 inHg)
inHg)
0.35 kPa 0.36 kPa
(2.6 mmHg, (2.7 mmHg,
0.103 inHg) 0.106 inHg)
0.43 kPa 0.447 kPa
(3.25 (3.35
mmHg, mmHg,
0.127 inHg) 0.132 inHg)
0.45 kPa 0.47 kPa
(3.4 mmHg, (3.5 mmHg,
0.133 inHg) 0.139 inHg)
0.48 kPa 0.49 kPa
(3.6 mmHg, (3.7 mmHg,
0.142 inHg) 0.145 inHg)