Subaru Legacy (2005 year). Manual - part 319

EN(H4DOTC)(diag)-45

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-03517

SBF-6

MAIN SBF

No.5

B72

B38

B75

B76

B134

B137

ECM

i3

E

3

6

1

1

*

A17

D15

i10

A:

D:

B72

B75

B76

i10

B137

1
2

1
2

1
2

1
2

D:

COMBINATION
METER

IGNITION
SWITCH

: TERMINAL No. RANDOM ARRANGEMENT

BATTERY

B134

B38

A:

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

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

4

16

3

8

*

*

C19

B138

1

3

4 5 6

2

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 9

10 11 12 13 14 15 16 17 18 19 20

1 2 3 4
5 6 7 8

B138

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 :

EN(H4DOTC)(diag)-46

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(H4DOTC)(diag
)-42, MALFUNC-
TION 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 ground 
short circuit of har-
ness between 
combination meter 
and ECM connec-
tor.

Go to step 3.

3

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

Connector & terminal

(B76) No. 1 — (B136) No. 19:

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:
• Open circuit of 
harness between 
test mode connec-
tor and ECM
• Poor contact in 
joint connector

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.
Measure the resistance of harness between 
ECM and test mode connector.

Connector & terminal

(B137) No. 15 — (B75) No. 1:

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(H4DOTC)-34, 
Engine Control 
Module (ECM).>

EN(H4DOTC)(diag)-47

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 in good 
order.

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

EN-03517

SBF-6

MAIN SBF

No.5

B72

B38

B75

B76

B134

B137

ECM

i3

E

3

6

1

1

*

A17

D15

i10

A:

D:

B72

B75

B76

i10

B137

1
2

1
2

1
2

1
2

D:

COMBINATION
METER

IGNITION
SWITCH

: TERMINAL No. RANDOM ARRANGEMENT

BATTERY

B134

B38

A:

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

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

4

16

3

8

*

*

C19

B138

1

3

4 5 6

2

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 9

10 11 12 13 14 15 16 17 18 19 20

1 2 3 4
5 6 7 8

B138

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 :

EN(H4DOTC)(diag)-48

ENGINE (DIAGNOSTICS)

Malfunction Indicator Light

2

CHECK HARNESS BETWEEN ECM CON-
NECTOR AND CHASSIS GROUND TERMI-
NAL.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of harness 
between ECM connector and chassis ground.

Connector & terminal

(B137) No. 15 — Chassis ground:

Is the resistance less than 5 
Ω?

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

Replace the ECM. 
<Ref. to 
FU(H4DOTC)-34, 
Engine Control 
Module (ECM).>

Step

Check

Yes

No