Subaru Legacy (2005 year). Manual - part 478

EN(H6DO)(diag)-225

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CN:DTC P1499 EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION 

(HIGH INPUT)

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Erroneous idling
• Poor driving performance
• Engine breathing

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)(diag)-41, 
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE, 
Inspection Mode.>.
WIRING DIAGRAM:

EN-03502

E

B47

E18

2

5

1

4

3

6

B21

E2

E76

E77

48

3

10

9

11

8

4

7

6

SBF-7

BATTERY

MAIN RELAY

EGR

VALVE

B134

ECM

B47

3

4

1

2

5

6

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

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

B134

10

E76

E77

21

32

33

22

B21

E2

E18

1

3

4 5 6

2

1 2

3 4

5

6

7

8

9

10

E77

6
4

EN(H6DO)(diag)-226

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CO:DTC P1518 STARTER SWITCH CIRCUIT LOW INPUT

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, conduct Clear Memory Mode <Ref. to EN(H6DO)(diag)-41, 
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE, 
Inspection Mode.>.

Step

Check

Yes

No

1

CHECK ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Check DTC using 
the List of Diag-
nostic Trouble 
Code (DTC). <Ref. 
to 
EN(H6DO)(diag)-
66, List of Diag-
nostic Trouble 
Code (DTC).>

Go to step 2.

2

CHECK HARNESS BETWEEN ECM AND 
EGR SOLENOID VALVE CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from EGR sole-
noid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM con-
nector and chassis ground.

Connector & terminal

DTC P1493; (B134) No. 11 (+) — Chassis 
ground (

−

):

DTC P1495; (B134) No. 10 (+) — Chassis 
ground (

−

):

DTC P1497; (B134) No. 9 (+) — Chassis 
ground (

−

):

DTC P1499; (B134) No. 8 (+) — Chassis 
ground (

−

):

Is the voltage more than 10 V? Repair the battery 

short in harness 
between ECM and 
EGR solenoid 
valve connector. 
After repair, 
replace the ECM. 
<Ref. to 
FU(H6DO)-34, 
Engine Control 
Module (ECM).>

Replace the ECM. 
<Ref. to 
FU(H6DO)-34, 
Engine Control 
Module (ECM).>

EN(H6DO)(diag)-227

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

WIRING DIAGRAM:

EN-03489

D8

B32

No.21

B225

MAIN SBF

SBF-6

E

1

3

2

4

ECM

B137

D:

B135

B:

B72

B14

M

2

3

B225

B137

B72

D:

B135

B:

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

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

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

1

3

4 5 6

2

BATTERY

IGNITION
SWITCH

STARTER
RELAY

STARTER MOTOR

*

*

*

*

*

LHD: 15
RHD: 16

1

*

LHD: 16
RHD: 15

2

*

LHD: 13
RHD: 14

3

*

LHD: 14
RHD: 13

4

EN(H6DO)(diag)-228

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, place the select lever in “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:
• 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(H6DO)(diag)-
54, STARTER 
MOTOR CIRCUIT, 
Diagnostics for 
Engine Starting 
Failure.>