Subaru Legacy (2005 year). Manual — part 142

EN(H4SO 2.0)(diag)-157

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AP:DTC P0512 STARTER REQUEST CIRCUIT

DTC DETECTING CONDITION:
Detects when malfunction occurs in 2 continuous driving cycles.
TROUBLE SYMPTOM:
Failure of engine to start

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.>.

EN(H4SO 2.0)(diag)-158

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN IGNITION
SWITCH AND ECM.
1) Disconnect the connector from ECM.
2) Measure the voltage between ECM and
chassis ground.

Connector & terminal

(B135) No. 23 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Repair the battery

short circuit of har-
ness between igni-
tion switch and
ECM.

Repair the poor
contact in ECM.

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)-159

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AQ:DTC P0519 IDLE AIR CONTROL SYSTEM PERFORMANCE

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
Engine keeps running at higher speed than specified idle speed.

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.>.

AR:DTC P0600 SERIAL COMMUNICATION LINK

NOTE:
For the diagnostic procedure, refer to LAN section. <Ref. to LAN(diag)-2, Basic Diagnostic Procedure.>

Step

Check

Yes

No

1

CHECK ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>

NOTE:
In this case, it is
not necessary to
inspect DTC
P0519.

Go to step 2.

2

CHECK AIR INTAKE SYSTEM.
1) Turn the ignition switch to ON.
2) Start and idle the engine.
3) Check the following items.
• Loose installation of intake manifold and
throttle body
• Cracks of intake manifold gasket and throttle
body gasket
• Disconnections of vacuum hoses

Is there any fault in air intake
system?

Repair air suction
and leaks.

Go to step 3.

3

CHECK ELECTRONIC THROTTLE CON-
TROL.
1) Turn the ignition switch to OFF.
2) Remove the electronic throttle control.
3) Check the electronic throttle control.

Are foreign matters found
inside the electronic throttle
control?

Remove foreign
matters from the
electronic throttle
control.

Perform the diag-
nosis of DTC
P2101.

EN(H4SO 2.0)(diag)-160

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AS:DTC P0604 INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY

(RAM) ERROR

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Engine does not start.
• Engine stalls.

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:

EN-03507

BATTERY

IGNITION
SWITCH

MAIN RELAY

SBF-6

MAIN SBF

SBF-7

B72

C4

C3

B14

B5

C6

B6

C1

C2

A7

C5

C7

B13

No.12

B47

E2

B21

2

1

4

6

5

3

ECM

E

E

3

6

B134

B135

A:

D: B137

B:

D1

52

37

36

34

3

4

1

2

5

6

B47

No.13

A2

35

B134

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

33 34

29

32

30 31

B135

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

29 30 31

32 33

34 35

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

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

A:

B:

D:

B136

C:

B136

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

33 34

29

32

30

31

35

C:

SBF-5

TO OXYGEN SENSOR