Subaru 2009 IMPREZA Service Manual page 825

Diagnostic Trouble Code (DTC) Detecting Criteria
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
calculated)
Mode E
(Evaporation generated amount
calculation)
Map 1
Fuel level (2, US gal, Imp gal)
Time Needed for Diagnosis (ms)
Map 2
Fuel level (2, US gal, Imp gal)
Time Needed for Diagnosis (ms)
Map 3
Fuel level (2, US gal, Imp gal)
Time Needed for Diagnosis (ms)
OK
Mode B Mode C
Cancel
Cancel
When the pressure in the tank is not near 0 mmHg, 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 change to the
Mode E shifting pressure. If the tank pressure does not change to
the Mode E shifting pressure, make advanced OK judgement.
Calculate the amount of evaporation (P1).
10, 2.64,
0
2.2
13800 13800
10, 2.64,
0
2.2
20030 20030
10, 2.64,
0
2.2
80000 80000
GD(H4SO)-101
OK OK
Mode D
Early OK 2
Cancel
Early OK 1
Mode Description
20, 5.28, 30, 7.93, 40, 10.57,
4.4 6.6
11400 9000
20, 5.28, 30, 7.93, 40, 10.57,
4.4 6.6
20800 21580
20, 5.28, 30, 7.93, 40, 10.57,
4.4 6.6
70000 60000
GENERAL DESCRIPTION
Mode E
Cancel
END
EN-02871
Diagnosis Period
0 — Value of Map 1
0 — Value of Map 2
0 — 25290 ms + 0 +
Value of Map 2
0 — 0 ms +
200000 ms
0 — 0 ms +
200000 ms +
Value of Map 3
50, 13.21, 60, 15.85,
8.8 11
7000 5000 5000
50, 13.21, 60, 15.85,
8.8 11
21970 22360 22360
50, 13.21, 60, 15.85,
8.8 11
60000 60000 60000
13.2
13.2
13.2