Subaru Legacy III (2000-2003 year). Manual - part 170

EN(H4SO)-292

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK OPERATION OF STARTER MOTOR.
Does starter motor operate when turning igni-
tion switch to “ST”?

NOTE:

Place the inhibitor switch in the “P” or “N” posi-
tion.

Operates.

Repair harness 
and connector.

NOTE:
In this case, repair
the following:
• Open or ground 
short circuit in har-
ness between 
ECM and starter 
motor connector.
• Poor contact in 
ECM connector.

Check starter 
motor circuit. <Ref. 
to EN(H4SO)-64, 
STARTER 
MOTOR CIR-
CUIT, Diagnostics 
for Engine Start-
ing Failure.>

EN(H4SO)-293

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO:

EN(H4SO)-294

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

CN:DTC P1560 — BACK-UP VOLTAGE CIRCUIT MALFUNCTION —

• DTC DETECTING CONDITION:

• Immediately at fault recognition

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-01119

F44

B61

6

RHD

RHD

B9

C21

C23

B1

C12

B2

E3

B22

A7

A35

C26

B21

D14

C19

13

15

14

16

B47

BATTERY

MAIN RELAY

1

2

3

5

6

4

SBF-5

SBF-4

SBF-1

3

1

B72

IGNITION 
SWITCH

ECM

B134

A :

B135

B :

B136

C :

B137

D :

C5

8

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

B135

B134

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

B47

3

4

1

2

5

6

B72

3 4

1 2

B22

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

C16

NO. 11

1 2 3 4
5 6 7 8

F44

B136

5 6

7

2

1

9

8

4

3

23

21 22

24

10 11 12 13 14

25 26

15 16 17

18 19 20

B137

4

1
5

3

2
6

18

15

16

7 8 9 10 11

17

19 20

12 13

14

LHD

LHD

: LHD MT MODEL

*

*

EN(H4SO)-295

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to OFF.
2) Measure voltage between ECM and chas-

sis ground.

Connector & terminal

(B135) No. 9 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Repair poor con-
tact in ECM con-
nector.

Go to step 2.

2

CHECK HARNESS BETWEEN ECM AND 
MAIN FUSE BOX CONNECTOR.
1) Disconnect connector from ECM.
2) Measure resistance of harness between 

ECM and chassis ground.

Connector & terminal

(B135) No. 9 — Chassis ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 3.

Repair ground 
short circuit in har-
ness between 
ECM connector 
and battery termi-
nal.

3

CHECK FUSE SBF-5.
Is fuse blown?

Fuse is brown.

Replace fuse.

Repair harness 
and connector.

NOTE:
In this case, repair
the following:

• Open circuit in 
harness between 
ECM and battery
• Poor contact in 
ECM connector
• Poor contact in 
battery terminal