Subaru Legacy IV (2008 year). Service manual — part 361
EN(H4DOTC)(diag)-265
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
WIRING DIAGRAM:
EN-05678
B47
1
2
4
6
3
5
SBF-7
E
F9
13
12
11
14
1
2
2
1
3
4
16
15
5
6
B143
F37
B144
B21
E2
E41
E40
B134
A:
B136
C:
F37
F11
B21
E40
B47
B144
F9
B143
F37
E41
1 2 3 4
12 13 14 15
5 6 7 8
16 17 18 19
9 10 11
20 21 22
23 24 25 26 27 28 29 30 31 32 33
35
34
37
36
39
38
41
40
43
42
44
45
47
46
49
48
51
50
53
52
54
MAIN
SBF
10A
60A
9
10
8
7
E
E
11
5
20
8
C30
C19
C8
A19
A27
A29
6
1
28
47
3
2
1
6
4
1
2
9
2
16
18
14
12
10
4
14
4
F11
1 2
3
4
1
2
5
6
1
3
4 5 6
2
B134
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
33 34
29
32
30 31
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
1
5
7
6
2
8
3
4
9
1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19 20
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
5
6
3
1
2
9
10
12
11
13
14
4
7 8
15
16
46
MAIN RELAY
BATTERY
RELAY HOLDER
SECONDARY
AIR
COMBINATION
VALVE RELAY1
SECONDARY
AIR
COMBINATION
VALVE RELAY2
SECONDARY
AIR PUMP
RELAY
SECONDARY
AIR PUMP
MAIN FUSE
BOX (M/B)
ECM
SECONDARY AIR
COMBINATION VALVE RH
(WITH BUILT-IN PRESSURE SENSOR)
SECONDARY AIR
COMBINATION
VALVE LH
EN(H4DOTC)(diag)-266
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR PUMP RELAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ECM
and secondary air pump relay.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 8 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair short cir-
cuit of the harness
to power supply
between the ECM
and secondary air
pump relay.
Even if DTC is
detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.
NOTE:
In this case, tem-
porary poor con-
tact of connector
may be the cause.
EN(H4DOTC)(diag)-267
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CT:DTC P1420 FUEL TANK PRESSURE CONTROL SOL. VALVE CIRCUIT HIGH
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-177, DTC P1420 FUEL TANK PRESSURE CONTROL
SOL. VALVE CIRCUIT HIGH, 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-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)-268
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
PRESSURE CONTROL SOLENOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ECM
and pressure control solenoid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 28 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the short
circuit to power
supply in the har-
ness between the
ECM and pressure
control solenoid
valve connector.
Go to step 2.
2
CHECK PRESSURE CONTROL SOLENOID
VALVE.
1) Turn the ignition switch to OFF.
2) Measure the resistance between pressure
control solenoid valve terminals.
Terminals
No. 1 — No. 2:
Is the resistance less than 1
:? Replace the pres-
sure control sole-
noid valve. <Ref. to
EC(H4DOTC)-16,
Pressure Control
Solenoid Valve.>
Repair the poor
contact of ECM
connector.
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