Subaru Legacy IV (2008 year). Service manual — part 572
EN(H6DO)(diag)-261
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CN:DTC P0461 FUEL LEVEL SENSOR “A” CIRCUIT RANGE/PERFORMANCE
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-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(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.
CO:DTC P0462 FUEL LEVEL SENSOR “A” CIRCUIT LOW
NOTE:
For the diagnostic procedure, refer to DTC P0463. <Ref. to EN(H6DO)(diag)-261, DTC P0463 FUEL LEVEL
SENSOR “A” CIRCUIT HIGH, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
CP:DTC P0463 FUEL LEVEL SENSOR “A” CIRCUIT HIGH
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-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(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
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(H6DO)(diag)-
81, List of Diagnos-
tic Trouble Code
(DTC).>
Replace the fuel
level sensor and
fuel sub level sen-
sor. <Ref. to
FU(H6DO)-57,
Fuel Level Sen-
sor.> <Ref. to
FU(H6DO)-58,
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-5, INSPEC-
TION, Combina-
tion 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(H6DO)(diag)-262
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CQ:DTC P0464 FUEL LEVEL SENSOR CIRCUIT INTERMITTENT
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-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(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.
CR:DTC P0500 VEHICLE SPEED SENSOR “A”
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-147, DTC P0500 VEHICLE SPEED SENSOR “A”, Diag-
nostic Trouble Code (DTC) Detecting Criteria.>
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
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-5, INSPEC-
TION, Combina-
tion 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 VDC.
Check DTC of VDC.
Is DTC of VDC displayed?
Perform the diag-
nosis according to
DTC. <Ref. to
VDC(diag)-34, List
of Diagnostic Trou-
ble Code (DTC).>
Repair the poor
contact of ECM
connector.
EN(H6DO)(diag)-263
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CS:DTC P0506 IDLE AIR CONTROL SYSTEM RPM LOWER THAN EXPECTED
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-148, DTC P0506 IDLE AIR CONTROL SYSTEM RPM
LOWER THAN EXPECTED, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Hard to start the engine.
• Engine does not start.
• Improper idling
• Engine stalls.
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B20
1 2 3 4 5 6
E57
1 2 3 4
5 6 7 8
B122
1 2
7 8
3
4
5
6
B362
36
52
34
35
37
E
E2
B21
E
A5
C21
C1
A29
19
E1
B20
A18
C6
A28
6
4
15
*
*
B122
16
E
38
39
20
D5
D4
A19
D7
D1
A3
D2
D3
3
E57
ELECTRONIC THROTTLE
CONTROL
2
1
5
B134
B362
5
7
6
A:
B137
B136
D:
C:
ECM
*
: TERMINAL No. OPTIONAL ARRANGEMENT
E
SBF-7
BATTERY
ELECTRONIC
THROTTLE
CONTROL RELAY
MAIN RELAY
8
6
4
B47
B47
3
4
1
2
5
6
EN-06873
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:
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
B137
D:
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
B134
A:
B21
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
EN(H6DO)(diag)-264
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(H6DO)(diag)-
81, List of Diagnos-
tic Trouble Code
(DTC).>
Go to step 2.
2
CHECK AIR CLEANER ELEMENT.
1) Turn the ignition switch to OFF.
2) Check the air cleaner element.
Is the air cleaner element
excessively clogged?
Replace the air
cleaner element.
<Ref. to
IN(H6DO)-4, Air
Cleaner Element.>
Go to step 3.
3
CHECK ELECTRONIC THROTTLE CON-
TROL.
1) Remove the electronic throttle control.
2) Check the electronic throttle control.
Are foreign matter found inside
electronic throttle control?
Remove foreign
matter from elec-
tronic throttle con-
trol.
Perform the diag-
nosis of DTC
P2101. <Ref. to
EN(H6DO)(diag)-
324, DTC P2101
THROTTLE
ACTUATOR CON-
TROL MOTOR
CIRCUIT RANGE/
PERFORMANCE,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>
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