Subaru Legacy III (2000-2003 year). Manual — part 148
EN(H4SO)-204
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AQ:DTC P0461 — FUEL LEVEL SENSOR CIRCUIT RANGE/PERFORMANCE —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-01132
NO. 5
27
B22
R3
R15
R57
R58
R59
B99
E3
B157
B72
i53
R98
R59
i10
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
1 2
SBF-1
SBF-4
IGNITION
SWITCH
COMBINATION
METER
FUEL GAUGE
FUEL PUMP ASSY
FUEL SUB
METER UNIT
FUEL LEVEL
SENSOR
FUEL SUB
LEVEL SENSOR
C3
A8
A20
i10
A :
i28
i11
B :
i12
C :
B16
A3
3
6
2
1
16
6
2
B72
4
1 2 3
6
5
1
3 4 5 6
2
R57
i12
1 2 3
4 5 6
7 8 9 10 11 12 13 14
i11
1 2 3 4
5 6 7
8 9 10 11 12 13 14 15 16
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
B99
1 2 3 4
5 6
10 11 12 13 14 15
7
16
23
30
19 20 21
22
26 27 28 29
8
17
24
31
9
18
25
32
B157
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 36
37
38
1
2
9
3
4
5
6
7
8
BATTERY
IGNITION RELAY
B135 ECM
R58
1 2
3 4
5 6
LHD MODEL : 12
RHD MODEL : 14
1
*
2
*
3
*
4
*
LHD MODEL : 29
RHD MODEL : 6
LHD MODEL : 30
RHD MODEL : 17
LHD MODEL : 9
RHD MODEL : 38
LHD MODEL : 13
RHD MODEL : 36
5
*
6
*
7
*
LHD MODEL : 11
RHD MODEL : 34
LHD MODEL : 10
RHD MODEL : 37
1
*
2
*
3
*
4
*
5
*
6
*
7
*
5
4
6 7
8
2
1
9
3
10
22
23
11 12 13 14 15
24 25
26 27
16 17 18
28 29
19 20
21
30
B136
R98
:LHD
:RHD
1 2 3
4 5 6
7 8 9 10 11 12 13 14
R98
1 2 3
4 5 6 7
8 9 10 11 12 13 14 15 16
EN(H4SO)-205
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
DTC indicated.
Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect this trou-
ble.
Replace fuel level
sensor <Ref. to
FU(H4SO)-64,
Fuel Level Sen-
sor.> and fuel sub
level sensor.
<Ref. to
FU(H4SO)-58,
Fuel Filler Pipe.>
EN(H4SO)-206
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AR:DTC P0462 — FUEL LEVEL SENSOR CIRCUIT LOW INPUT —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-01132
NO. 5
27
B22
R3
R15
R57
R58
R59
B99
E3
B157
B72
i53
R98
R59
i10
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
1 2
SBF-1
SBF-4
IGNITION
SWITCH
COMBINATION
METER
FUEL GAUGE
FUEL PUMP ASSY
FUEL SUB
METER UNIT
FUEL LEVEL
SENSOR
FUEL SUB
LEVEL SENSOR
C3
A8
A20
i10
A :
i28
i11
B :
i12
C :
B16
A3
3
6
2
1
16
6
2
B72
4
1 2 3
6
5
1
3 4 5 6
2
R57
i12
1 2 3
4 5 6
7 8 9 10 11 12 13 14
i11
1 2 3 4
5 6 7
8 9 10 11 12 13 14 15 16
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
B99
1 2 3 4
5 6
10 11 12 13 14 15
7
16
23
30
19 20 21
22
26 27 28 29
8
17
24
31
9
18
25
32
B157
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 36
37
38
1
2
9
3
4
5
6
7
8
BATTERY
IGNITION RELAY
B135 ECM
R58
1 2
3 4
5 6
LHD MODEL : 12
RHD MODEL : 14
1
*
2
*
3
*
4
*
LHD MODEL : 29
RHD MODEL : 6
LHD MODEL : 30
RHD MODEL : 17
LHD MODEL : 9
RHD MODEL : 38
LHD MODEL : 13
RHD MODEL : 36
5
*
6
*
7
*
LHD MODEL : 11
RHD MODEL : 34
LHD MODEL : 10
RHD MODEL : 37
1
*
2
*
3
*
4
*
5
*
6
*
7
*
5
4
6 7
8
2
1
9
3
10
22
23
11 12 13 14 15
24 25
26 27
16 17 18
28 29
19 20
21
30
B136
R98
:LHD
:RHD
1 2 3
4 5 6
7 8 9 10 11 12 13 14
R98
1 2 3
4 5 6 7
8 9 10 11 12 13 14 15 16
EN(H4SO)-207
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK SPEEDOMETER AND TACHOME-
TER OPERATION IN COMBINATION
METER.
Does speedometer and tachometer operate
normally?
Operates normally.
Repair or replace
combination
meter. <Ref. to
IDI-4, Combina-
tion Meter Sys-
tem.>
2
CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to ON. (Engine OFF)
2) Measure voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 27 (+) — Chassis ground (
−−−−
):
Is the measured value less than the speci-
fied value?
0.12 V
3
CHECK INPUT SIGNAL FOR ECM. (USING
SUBARU SELECT MONITOR.)
Read data of fuel level sensor signal using
Subaru Select Monitor.
Is the measured value less than the specified
value by shaking harness and connector of
ECM while monitoring the value with Subaru
Select Monitor?
NOTE:
•Subaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”.
<Ref. to EN(H4SO)-32, Subaru Select Moni-
tor.>
0.12 V
Repair poor con-
tact in ECM con-
nector.
Even if MI lights
up, the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector
may be the cause.
NOTE:
In this case, repair
the following:
• Poor contact in
combination meter
connector
• Poor contact in
ECM connector
• Poor contact in
coupling connec-
tors
4
CHECK INPUT VOLTAGE OF ECM.
1) Turn ignition switch to OFF.
2) Separate fuel tank cord connector (R57)
and rear wiring harness connector (R15).
3) Turn ignition switch to ON.
4) Measure voltage of harness between ECM
connector and chassis ground.
Connector & terminal
(B136) No. 27 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
0.12 V
5
CHECK HARNESS BETWEEN ECM AND
COMBINATION METER.
1) Turn ignition switch to OFF.
2) Disconnect connector from connector (i10)
and ECM connector.
3) Measure resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 27 — Chassis ground:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Repair ground
short circuit in har-
ness between
ECM and combi-
nation meter con-
nector.
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