Subaru Legacy IV (2008 year). Service manual — part 161
EN(H4SO)(diag)-247
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CL:DTC P1420 FUEL TANK PRESSURE CONTROL SOL. VALVE CIRCUIT HIGH
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-163, 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(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-06840
5
3
6
4
2
1
B47
SBF-7
E4
1
2
E2
B21
41
48
D29
R68
1
2
R213
R15
1
5
R1
B97
14
15
R67
R46
7
6
C17
C28
R144
1
2
B136
C:
B137
D:
3
1
2
4
5
6
B47
R213
E
PURGE CONTROL
SOLENOID VALVE
ECM
DRAIN VALVE
PRESSURE CONTROL
SOLENOID VALVE
MAIN RELAY
BATTERY
B21
E4
1 2
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
1 2
3
4 5 6 7 8
1 2
R68
1 2
B97
R144
R67
1
2
3 4 5 6
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:
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
EN(H4SO)(diag)-248
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(H4SO)-13,
Pressure Control
Solenoid Valve.>
Repair the poor
contact of ECM
connector.
EN(H4SO)(diag)-249
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CM:DTC P1443 VENT CONTROL SOLENOID VALVE FUNCTION PROBLEM
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-165, DTC P1443 VENT CONTROL SOLENOID VALVE
FUNCTION PROBLEM, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Improper fuel supply
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-06841
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
17
B97
R1
1
2
7
R144
R15
R213
R46
R67
ECM
B136
SBF-7
5
3
6
4
2
1
B47
6
1
E
DRAIN
VALVE
MAIN RELAY
BATTERY
B47
3
4
1
2
5
6
1 2
3
4 5 6 7 8
1
2
3 4 5 6
R67
R213
B97
14
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
1 2
R144
EN(H4SO)(diag)-250
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Check the appro-
priate DTC using
the “List of Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H4SO)(diag)-
80, List of Diagnos-
tic Trouble Code
(DTC).>
Go to step 2.
2
CHECK DRAIN HOSE.
Check the drain hose for clogging.
Is there clogging in the drain
hose?
Replace the drain
hose.
Go to step 3.
3
CHECK DRAIN VALVE OPERATION.
1) Turn the ignition switch to OFF.
2) Connect the delivery (test) mode connector
at the lower portion of instrument panel (on the
driver’s side).
3) Turn the ignition switch to ON.
4) Operate the drain valve.
NOTE:
Drain valve can be operated using the Subaru
Select Monitor. For the procedures, refer to
“Compulsory Valve Operation Check Mode”.
<Ref. to EN(H4SO)(diag)-51, Compulsory
Valve Operation Check Mode.>
Does the drain valve operate?
Repair the poor
contact of ECM
connector.
Replace the drain
valve. <Ref. to
EC(H4SO)-16,
Drain Valve.>
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