Subaru LEGACY 2006 Manual page 559

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Mode Table for Evaporative Emission Control System Diagnosis
Behavior of tank internal pressure under
Mode
Roughly the same as atmospheric pres-
Mode Z
sure (Same as 0 kPa (0 mmHg, 0 inHg))
Pressure is in proportion to amount of
Mode A
evaporative emission.
Negative pressure is formed due to
Mode B
intake manifold negative pressure
Mode C Reaches target pressure
Mode D Pressure change is small.
0.02-inch Diagnosis
OK
Mode A
Cancel
Mode
Mode A
(0 point compensation)
Mode B
(Negative pressure introduced)
Mode C
(Negative pressure maintained)
Mode D
(Negative pressure change calcu-
lated)
Mode E
(Evaporation generated amount cal-
culation)
normal conditions
OK
Mode B Mode C
Cancel
Cancel
Mode Description
When the pressure in the tank is high, wait until it returns to 0
point (Near 0 mmHg,).
Decrease the pressure in the tank to the target value by introduc-
ing the intake manifold pressure to the fuel tank.
Wait until the tank pressure returns to the target (start level of P2
calculation).
Calculate the time it takes for the tank pressure to return to the P2
calculation complete pressure. If the tank pressure does not
return to the P2 calculation complete pressure, make advanced
OK judgment.
Calculate the amount of evaporation (P1).
GD(H4SO)-122
Diagnostic item
Purge control solenoid valve is judged to
be open.
Large leak
EVAP system large leak determination.
[1.0 mm (0.04 in)]
OK OK
Mode D Mode E
Early OK 2
Cancel
Early OK 1
DTC
P0457
P0457
None
P0442
Cancel
END
EN-02871
Diagnosis Period
0 — 12 seconds
0 — 27 seconds
0 — 20 seconds
0 — 200 seconds
0 — 280 seconds