Subaru Legacy (2005 year). Manual - part 114

EN(H4SO 2.0)(diag)-45

ENGINE (DIAGNOSTICS)

Malfunction Indicator Light

D: MALFUNCTION INDICATOR LIGHT DOES NOT GO OFF.

DIAGNOSIS:
The malfunction indicator light circuit is shorted.
TROUBLE SYMPTOM:
Although malfunction indicator light comes on when the engine runs, DTC is not shown on the Subaru Select
Monitor display.
WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Turn the ignition switch to ON.

Does the malfunction indicator 
light illuminate?

Repair the short 
circuit of harness 
between combina-
tion meter and 
ECM connector.

Replace the ECM. 
<Ref. to FU(H4SO 
2.0)-34, Engine 
Control Module 
(ECM).>

EN-03469

BATTERY

3

B72

i3

B38

B135

IGNITION
SWITCH

COMBINATION
METER

i10

SBF-6

6

15

ECM

4

8

MAIN SBF

No.5

16

E

3

B72

1

3

4 5 6

2

B38

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

i10

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

B135

8

1

28

20

5

6

7

2

9

4

3

10

24

22 23

25

11 12 13 14 15

26 27

16 17 18 19

21
29 30 31

32 33

34 35

EN(H4SO 2.0)(diag)-46

ENGINE (DIAGNOSTICS)

Malfunction Indicator Light

E: MALFUNCTION INDICATOR LIGHT DOES NOT BLINK.

DIAGNOSIS:
• The malfunction indicator light circuit is open or shorted.
• Test mode connector circuit is open.
TROUBLE SYMPTOM:
Malfunction indicator light does not blink during inspection mode.
WIRING DIAGRAM:

EN-03470

BATTERY

3

B72

B75

B76

IGNITION
SWITCH

i10

COMBINATION
METER

B135

B:

6

B15

B24

ECM

B72

8

No.5

1

1

B75

1
2

1
2

16

i3

B38

E

4

3

1

3

4 5 6

2

i10

B38

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

1 2 3 4
5 6 7 8

B122

E

B21

E2

36

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

B:

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

B83

*

*

MAIN SBF

SBF-6

: TERMINAL No. RANDOM ARRANGEMENT

*

 B83

B122 : LHD

: RHD

EN(H4SO 2.0)(diag)-47

ENGINE (DIAGNOSTICS)

Malfunction Indicator Light

Step

Check

Yes

No

1

CHECK STATUS OF MALFUNCTION INDI-
CATOR LIGHT.
1) Turn the ignition switch to OFF.
2) Disconnect the test mode connectors.
3) Turn the ignition switch to ON. (engine 
OFF)

Does the malfunction indicator 
light illuminate?

Go to step 2.

Repair the mal-
function indictor 
light circuit. <Ref. 
to EN(H4SO 
2.0)(diag)-43, 
MALFUNCTION 
INDICATOR 
LIGHT DOES NOT 
COME ON, Mal-
function Indicator 
Light.>

2

CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Turn the ignition switch to ON.

Does the malfunction indicator 
light illuminate?

Repair the short 
circuit of harness 
between combina-
tion meter and 
ECM connector.

Go to step 3.

3

CHECK HARNESS BETWEEN TEST MODE 
CONNECTOR AND CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of harness 
between test mode connector and chassis 
ground.

Connector & terminal

(B76) No. 1 — Chassis ground:

Is the resistance less than 1 
Ω?

Go to step 4.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following item:
• Open circuit of 
harness between 
test mode connec-
tor and chassis 
ground

4

CHECK POOR CONTACT.
Check poor contact in ECM connector.

Is there poor contact in ECM 
connector?

Repair the poor 
contact in ECM 
connector.

Go to step 5.

5

CHECK HARNESS BETWEEN ECM AND 
TEST MODE CONNECTOR.
1) Connect the test mode connector.
2) Measure the resistance of harness 
between ECM and chassis ground.

Connector & terminal

(B135) No. 24 — Chassis ground:

Is the resistance less than 1 
Ω?

Go to step 6.

Repair the open 
circuit of harness 
between ECM and 
test mode connec-
tor.

6

CHECK POOR CONTACT.
Check poor contact in ECM connector.

Is there poor contact in ECM 
connector?

Repair the poor 
contact in ECM 
connector.

Replace the ECM. 
<Ref. to FU(H4SO 
2.0)-34, Engine 
Control Module 
(ECM).>

EN(H4SO 2.0)(diag)-48

ENGINE (DIAGNOSTICS)

Malfunction Indicator Light

F: MALFUNCTION INDICATOR LIGHT REMAINS BLINKING.

DIAGNOSIS:
Test mode connector circuit is shorted.
TROUBLE SYMPTOM:
Malfunction indicator light blinks when test mode connector is not connected.
WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK TEST MODE CONNECTOR.
1) Disconnect the test mode connectors.
2) Turn the ignition switch to ON.

Does the malfunction indicator 
light blink?

Go to step 2.

System is normal.

NOTE:
Malfunction indica-
tor light blinks at a
cycle of 3 Hz when
test mode connec-
tor is connected.

EN-03470

BATTERY

3

B72

B75

B76

IGNITION
SWITCH

i10

COMBINATION
METER

B135

B:

6

B15

B24

ECM

B72

8

No.5

1

1

B75

1
2

1
2

16

i3

B38

E

4

3

1

3

4 5 6

2

i10

B38

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

1 2 3 4
5 6 7 8

B122

E

B21

E2

36

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

B:

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

B83

*

*

MAIN SBF

SBF-6

: TERMINAL No. RANDOM ARRANGEMENT

*

 B83

B122 : LHD

: RHD