Subaru LEGACY 2006 Manual page 558

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Diagnostic Trouble Code (DTC) Detecting Criteria
0.04-inch Diagnosis
OK
Mode
Z
Mode
NG
Extend
Mode
Mode Z
(Purge control solenoid valve open-
ing failure diagnosis)
Mode A
(Estimated evaporation amount)
Mode B
(Sealed negative pressure, large
leakage judgment)
Mode C
(Pressure increase check,
advanced OK judgment)
Mode D
(Negative pressure variation mea-
surement, evaporation leakage
diagnosis)
OK OK
Mode Mode Mode
B
A
Large leakage judgement
Cancel
NG
Z
OK
Mode Description
Perform purge control solenoid valve opening failure diagnosis
from the size of tank pressure variation from diagnosis start.
Calculate the tank pressure change amount (P1).
Decrease the pressure in the tank to the target value by introduc-
ing the intake manifold pressure to the fuel tank.
If the tank pressure cannot be reduced, it is diagnosed as large
leak.
Wait until the tank pressure returns to the target (start level of P2
calculation). If the tank pressure does not become the value,
make advanced OK judgment.
Calculate the tank pressure variation (P2), and obtain the diag-
nostic value using P1 found in Mode A.
Perform the evaporation diagnosis using the diagnostic value.
GD(H4SO)-121
OK OK
Mode
C D
NG
Early OK
GENERAL DESCRIPTION
END
EN-02872
Diagnosis Period
3 — 16 seconds
10 seconds
5 — 25 seconds
1 — 15 seconds
10 seconds