Subaru Legacy IV (2008 year). Service manual — part 350
EN(H4DOTC)(diag)-221
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BN:DTC P0448 EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL
CIRCUIT SHORTED
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-126, DTC P0448 EVAPORATIVE EMISSION CON-
TROL SYSTEM VENT CONTROL CIRCUIT SHORTED, Diagnostic Trouble Code (DTC) Detecting Crite-
ria.>
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-05679
SBF-7
E4
B47
E
5
3
6
4
2
1
2
1
C17
C28
D29
C7
R15
R213
R68
R144
R1
B97
14
15
2
2
1
1
7
1
5
E52
2
1
E52
R144
E4
B47
R67
B97
R213
R68
1 2
3
4
1
2
5
6
B21
1 2
1 2
3
4 5 6 7 8
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
34
35
42
43
36
37
38
39
48
49
50
51
52
53
54
40
41
44
45
46
47
1
2
3 4 5 6
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
R46
R67
6
B21
E2
11
48
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
B136
C:
B137
5
6
7
8
2
1
9
4
3
10
22 23
11 12 13 14 15
24 25
26
16 17
18 19 20 21
27
28 29
30 31
D:
B136
C:
B137
D:
44
MAIN RELAY
ECM
BATTERY
DRAIN VALVE
PRESSURE
CONTROL
SOLENOID VALVE
PURGE CONTROL
SOLENOID VALVE 1
PURGE CONTROL
SOLENOID VALVE 2
EN(H4DOTC)(diag)-222
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
DRAIN VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM
and drain valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 17 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the short
circuit to the power
supply in the har-
ness between the
ECM and drain
valve connector.
Go to step 2.
2
CHECK DRAIN VALVE.
1) Turn the ignition switch to OFF.
2) Measure the resistance between drain valve
terminals.
Terminals
No. 1 — No. 2:
Is the resistance less than 1
:? Replace the drain
valve. <Ref. to
EC(H4DOTC)-19,
Drain Valve.>
Repair the poor
contact of ECM
connector.
EN(H4DOTC)(diag)-223
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BO:DTC P0451 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE
SENSOR
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-128, DTC P0451 EVAPORATIVE EMISSION CON-
TROL SYSTEM PRESSURE SENSOR, Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-05095
B83
3
1
2
22
32
30
ECM
B135
R47
R213
R15
R1
B97
B97
1 2 3
R47
B135
7
4
6
6
13
17
B83
R213
FUEL
TANK
PRESSURE
SENSOR
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
3 4
5 6
1 2
7 8
1 2
3
4 5 6 7 8
: TERMINAL No. OPTIONAL
ARRANGEMENT
*
*
*
5
6
7
8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26 27
28
16 17 18 19
20 21
29 30 31
32 33
34 35
EN(H4DOTC)(diag)-224
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK FUEL FILLER CAP.
1) Turn the ignition switch to OFF.
2) Open the fuel flap.
Is the fuel filler cap tightened
securely?
Go to step 2.
Tighten fuel filler
cap securely.
2
CHECK PRESSURE VACUUM LINE.
NOTE:
Check the following items.
• Disconnection, leakage and clogging of the
vacuum hoses and pipes between fuel tank
pressure sensor and fuel tank
• Disconnection, leakage and clogging of the
air ventilation hoses and pipes between fuel fill-
er pipe and fuel tank
Is there any fault in pressure/
vacuum line?
Repair or replace
the hoses and
pipes.
Replace the fuel
tank pressure sen-
sor. <Ref. to
EC(H4DOTC)-15,
Fuel Tank Pres-
sure Sensor.>
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