Subaru Legacy (2005 year). Manual - part 149

EN(H4SO 2.0)(diag)-185

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

WIRING DIAGRAM:

EN-03471

B225

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

39 40

37
38

1

2

9

3

4

5

6

7

8

B12

1 2 3 4
5 6 7 8
9 10 11 12

B25

1 2

1 2 3 4
5 6 7 8

B83

B122

T7

1 2 3 4 5 6
7 8 9 10 11 12

B135

1

2

7

8 9

5

6

3

4

10 11 12

19

20 21

29 30 31

13 14 15 16 17

27

28

18

22 23

24 25

26

32 33

34 35

B21

1 2 3 4

12 13 14 15

5 6 7 8

16 17 18 19

9 10 11

20 21 22

23 24 25 26 27 28 29 30 31 32 33

35

34

37

36

39

38

41

40

43

42

44

45

47

46

49

48

51

50

53

52

54

B72

1

3

4 5 6

2

23

ECM

B135

B14

M

STARTER MOTOR

E

12

12

B12

T3

T7

P

N

7

11

AT

AT

MT

MT

No.21

MAIN SBF

SBF-6

E

B72

2

3

BATTERY

IGNITION
SWITCH

B225

16

14

16

14

STARTER
RELAY

15

13

15

13

LHD

RHD

LHD

RHD

MT

12

B21

E2

E

36

NEUTRAL
POSITION
SWITCH

1

B25

T2

T2

B25

2

*

B83

B122 : LHD

: RHD

JOINT
CONNECTOR

*

B21

E2

35

*

: TERMINAL No. RANDOM
  ARRANGEMENT

EN(H4SO 2.0)(diag)-186

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK OPERATION OF STARTER MOTOR.
Turn the ignition switch to START.

NOTE:

• For AT model, set the selector lever in the 
“P” or “N” range.
• For MT model, depress the clutch pedal.

Does the starter motor oper-
ate?

Repair the har-
ness and connec-
tor.

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

Check the starter 
motor circuit. <Ref. 
to EN(H4SO 
2.0)(diag)-51, 
STARTER 
MOTOR CIRCUIT, 
Diagnostics for 
Engine Starting 
Failure.>

EN(H4SO 2.0)(diag)-187

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BN:DTC P1521 BRAKE CIRCUIT RANGE/PERFORMANCE PROBLEM(HIGH IN-

PUT)

DTC DETECTING CONDITION:
Immediately at fault recognition

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and 
chassis ground.

Connector & terminal

(B137) No. 12 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 2.

Go to step 3.

EN-03510

12

No.4

B65

MAIN SBF

SBF-8

E

4

1

ECM

B137

BATTERY

BREKE SWITCH

B65

3 4

1 2

B137

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

EN(H4SO 2.0)(diag)-188

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

2

CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and 
chassis ground with brake pedal depressed.

Connector & terminal

(B137) No. 12 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Repair the battery 

short circuit 
between ECM and 
brake switch.

Go to step 3.

3

CHECK BRAKE SWITCH.
1) Turn the ignition switch to OFF.
2) Measure the resistance between brake 
switch connectors.

Terminals

(B65) No. 1 — (B65) No. 4:

Is the resistance less than 1 
Ω?

Go to step 4.

Replace the brake 
switch. <Ref. to 
CC-6, Stop Light & 
Brake Switch.>

4

CHECK BRAKE SWITCH.
Measure the resistance between brake switch 
connectors with brake pedal depressed.

Terminals

(B65) No. 1 — (B65) No. 4:

Is the resistance more than 1 
M

Ω?

Check poor con-
tact in ECM con-
nector.

Replace the brake 
switch. <Ref. to 
CC-6, Stop Light & 
Brake Switch.>

Step

Check

Yes

No