Subaru Legacy IV (2008 year). Service manual — part 354
EN(H4DOTC)(diag)-237
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BU:DTC P0459 EVAPORATIVE EMISSION SYSTEM PURGE CONTROL VALVE
CIRCUIT HIGH
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-136, DTC P0459 EVAPORATIVE EMISSION SYS-
TEM PURGE CONTROL VALVE CIRCUIT HIGH, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Improper idling
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)-238
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
OPEN CIRCUIT IN HARNESS BETWEEN
ECM AND PURGE CONTROL SOLENOID
VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
purge control solenoid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 29 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the short
circuit to power in
the harness
between ECM and
purge control sole-
noid valve connec-
tor.
Go to step 2.
2
CHECK PURGE CONTROL SOLENOID
VALVE.
1) Turn the ignition switch to OFF.
2) Measure the resistance between purge con-
trol solenoid valve terminals.
Terminals
No. 1 — No. 2:
Is the resistance less than 1
:? Replace the purge
control solenoid
valve. <Ref. to
EC(H4DOTC)-9,
Purge Control
Solenoid Valve.>
Repair the poor
contact of ECM
connector.
EN(H4DOTC)(diag)-239
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BV:DTC P0461 FUEL LEVEL SENSOR “A” CIRCUIT RANGE/PERFORMANCE
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-138, DTC P0461 FUEL LEVEL SENSOR “A” CIRCUIT
RANGE/PERFORMANCE, 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.>.
BW:DTC P0462 FUEL LEVEL SENSOR “A” CIRCUIT LOW
NOTE:
For the diagnostic procedure, refer to DTC P0463. <Ref. to EN(H4DOTC)(diag)-239, DTC P0463 FUEL LEV-
EL SENSOR “A” CIRCUIT HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
BX:DTC P0463 FUEL LEVEL SENSOR “A” CIRCUIT HIGH
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-142, DTC P0463 FUEL LEVEL SENSOR “A” 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.>.
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(H4DOTC)(diag)
-81, List of Diag-
nostic Trouble
Code (DTC).>
Replace the fuel
level sensor and
fuel sub level sen-
sor. <Ref. to
FU(H4DOTC)-72,
Fuel Level Sen-
sor.> <Ref. to
FU(H4DOTC)-73,
Fuel Sub Level
Sensor.>
Step
Check
Yes
No
1
CHECK FOR ANY OTHER DTC ON DISPLAY. Is DTC P0462 or P0463 dis-
played on the Subaru Select
Monitor?
Check the combi-
nation meter. <Ref.
to IDI-13, CHECK
FUEL LEVEL
SENSOR,
INSPECTION,
Combination Meter
System.>
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)-240
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
BY:DTC P0464 FUEL LEVEL SENSOR CIRCUIT INTERMITTENT
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-144, DTC P0464 FUEL LEVEL SENSOR CIRCUIT IN-
TERMITTENT, 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.>.
BZ:DTC P0500 VEHICLE SPEED SENSOR “A”
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-147, DTC P0500 VEHICLE SPEED SENSOR “A”, Di-
agnostic 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.>.
Step
Check
Yes
No
1
CHECK FOR ANY OTHER DTC ON DISPLAY. Is DTC P0464 displayed on the
display?
Check the combi-
nation meter. <Ref.
to IDI-13, CHECK
FUEL LEVEL
SENSOR,
INSPECTION,
Combination Meter
System.>
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.
Step
Check
Yes
No
1
CHECK DTC OF ABS OR VDC.
Check DTC of ABS or VDC.
Is DTC of ABS or VDC dis-
played?
Perform the diag-
nosis according to
DTC. <Ref. to
ABS(diag)-29, List
of Diagnostic Trou-
ble Code (DTC).>
<Ref. to
VDC(diag)-34, List
of Diagnostic Trou-
ble Code (DTC).>
Repair the poor
contact of ECM
connector.
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