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

B22

R15

R57

R58

R59

B99

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

A20

i10

A :

i28

i11

B :

i12

C :

B16

6
2

B72

1 2 3

1
3 4 5 6

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

19 20 21

26 27 28 29

B157

11 12 13

14 15 16

17
18

21 22 23

24 25 26

27
28

31 32 33

34 35 36

37
38

BATTERY

IGNITION RELAY

B135 ECM

R58

1 2
3 4
5 6

LHD MODEL : 12
RHD MODEL : 14

LHD MODEL : 29
RHD MODEL : 6

LHD MODEL : 30
RHD MODEL : 17

LHD MODEL : 9
RHD MODEL : 38

LHD MODEL : 13
RHD MODEL : 36

LHD MODEL : 11
RHD MODEL : 34

LHD MODEL : 10
RHD MODEL : 37

6 7

11 12 13 14 15

24 25

26 27

16 17 18

28 29

19 20

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

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

EN-01132

NO. 5

B22

R15

R57

R58

R59

B99

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

A20

i10

A :

i28

i11

B :

i12

C :

B16

6
2

B72

1 2 3

1
3 4 5 6

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

19 20 21

26 27 28 29

B157

11 12 13

14 15 16

17
18

21 22 23

24 25 26

27
28

31 32 33

34 35 36

37
38

BATTERY

IGNITION RELAY

B135 ECM

R58

1 2
3 4
5 6

LHD MODEL : 12
RHD MODEL : 14

LHD MODEL : 29
RHD MODEL : 6

LHD MODEL : 30
RHD MODEL : 17

LHD MODEL : 9
RHD MODEL : 38

LHD MODEL : 13
RHD MODEL : 36

LHD MODEL : 11
RHD MODEL : 34

LHD MODEL : 10
RHD MODEL : 37

6 7

11 12 13 14 15

24 25

26 27

16 17 18

28 29

19 20

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

CHECK SPEEDOMETER AND TACHOME-
TER OPERATION IN COMBINATION
METER.
Does speedometer and tachometer operate
normally?

Operates normally.

Go to step 2.

Repair or replace
combination
meter. <Ref. to
IDI-4, Combina-
tion Meter Sys-
tem.>

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

Go to step 6.

Go to step 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

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

Go to step 4.

Go to step 7.

CHECK HARNESS BETWEEN ECM AND
COMBINATION METER.
1) Turn ignition switch to OFF.
2) Disconnect connector from connector (i10)