Subaru Legacy III (2000-2003 year). Manual - part 149

EN(H4SO)-208

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

6

CHECK HARNESS BETWEEN ECM AND 
COMBINATION METER.
Measure resistance between ECM and combi-
nation meter connector.

Connector & terminal

(B136) No. 27 — (i10) No. 3:

Is the measured value less than the specified 
value?

10 

Ω

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

Repair open circuit 
between ECM and 
combination meter 
connector.

NOTE:
In this case, repair
the following:
Poor contact in 
coupling connector

7

CHECK FUEL TANK CORD.
1) Turn ignition switch to OFF.
2) Disconnect connector from fuel sub level 

sensor.

3) Measure resistance between fuel sub level 

sensor and chassis ground.

Connector & terminal

(R59) No. 1 — Chassis ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 8.

Repair ground 
short circuit in fuel 
tank cord.

8

CHECK FUEL TANK CORD.
1) Disconnect connector from fuel pump 

assembly.

2) Measure resistance between fuel pump 

assembly and chassis ground.

Connector & terminal

(R59) No. 2 — Chassis ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 9.

Repair ground 
short circuit in fuel 
tank cord.

9

CHECK FUEL LEVEL SENSOR.

Warning:

During work procedures, if fuel tank is more
than 3/4 full, be careful because fuel may
spill.

1) Remove fuel pump assembly. <Ref. to 

FU(H4SO)-62, Fuel Pump.>

2) Measure resistance between fuel level sen-

sor and terminals with its float set to the full 
position.

Terminals

No. 3 — No. 6:

Is the measured value within the specified 
range?

0.5 - 2.5 

Ω

Go to step 10.

Replace fuel level 
sensor.

10

CHECK FUEL SUB LEVLE SENSOR.

Warning:

During work procedures, if fuel tank is more
than 3/4 full, be careful because fuel may
spill.

1) Remove fuel sub level sensor. <Ref. to 

FU(H4SO)-65, Fuel Sub Level Sensor.>

2) Measure resistance between fuel sub level 

sensor and terminals with its float set to the 
full position.

Terminals

No. 1 — No. 2:

Is the measured value within the specified 
range?

0.5 - 2.5 

Ω

Repair poor con-
tact in harness 
between ECM and 
combination meter 
connector.

Replace fuel sub 
level sensor.

Step

Value

Yes

No

EN(H4SO)-209

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO:

EN(H4SO)-210

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

AS:DTC P0463 — FUEL LEVEL SENSOR CIRCUIT HIGH 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)-211

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.

Go to step 2.

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 (

−−−−

):

Does the measured value exceed the spec-
ified value?

4.75 V

Go to step 3.

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 
fuel pump connec-
tor
• Poor contact in 
coupling connector

3

CHECK INPUT VOLTAGE OF ECM.
1) Turn ignition switch to OFF.
2) Disconnect combination meter connector 

(i10) and ECM connector.

3) Turn ignition switch to ON.
4) Measure voltage of harness between ECM 

and chassis ground.

Connector & terminal

(B136) No. 27 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

4.75 V

Repair battery 
short circuit 
between ECM and 
combination meter 
connector.

Go to step 4.

4

CHECK HARNESS BETWEEN ECM AND 
FUEL TANK CORD.
1) Turn ignition switch to OFF.
2) Separate fuel tank cord connector (R57) 

and rear wiring harness connector (R15).

3) Measure resistance between ECM and fuel 

tank cord.

Connector & terminal

(B136) No. 27 — (R15) No. 2:

Is the measured value less than the speci-
fied value?

5 

Ω

Go to step 5.

Repair open circuit 
between ECM and 
fuel tank cord.

5

CHECK HARNESS BETWEEN FUEL TANK 
CORD AND CHASSIS GROUND.
Measure resistance between fuel tank cord 
and chassis ground.

Connector & terminal

(R15) No. 6 — Chassis ground:

Is the measured value less than the specified 
value?

5 

Ω

Go to step 6.

Repair open circuit 
between fuel tank 
cord and chassis 
ground.

NOTE:
In this case, repair
the following:
Poor contact in 
coupling connec-
tors