Subaru IMPREZA GD 2007 Series Manual page 2196

asieps_tobira_IM_US.book 129 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Trouble Code (DTC) Detecting Criteria
0.04-inch Diagnosis
OK
Mode
Z
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)
Purge control solenoid valve 2 stuck
close diagnosis
OK OK
Mode
Mode Mode
B
A
Large leakage judgement
Cancel
NG
Mode
Z
OK
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 introducing
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 cal-
culation). If the tank pressure does not become the value, make
advanced OK judgment.
Calculate the tank pressure variation (P2), and obtain the diagnostic
value using P1 found in Mode A.
Perform the evaporation diagnosis using the diagnostic value.
Perform purge control solenoid valve 2 stuck close diagnosis using
the variation gap between the tank pressure at the end of mode C and
after mode C.
GD(STI)-129
OK OK
Mode
C D
NG
CPC2
Early OK
clogging
NG
diagnosis
Mode Description
GENERAL DESCRIPTION
END
EN-04900
Diagnosis Period
3 — 16 seconds
10 seconds
5 — 25 seconds
1 — 15 seconds
10 seconds
3 seconds