Subaru Legacy (2005 year). Service manual — part 190

EN(H4SO 2.5)(diag)-45

ENGINE (DIAGNOSTICS)

Malfunction Indicator Light

C: MALFUNCTION INDICATOR LIGHT DOES NOT COME ON

DIAGNOSIS:
The malfunction indicator light circuit is open or shorted.
TROUBLE SYMPTOM:
When the ignition switch is turned to ON (engine OFF), malfunction indicator light does not come on.
WIRING DIAGRAM:
• EC, EK, EH, ER and K4 model

• KA and KS model

NOTE:
Fuel injection system for KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.

EN-03152

BATTERY

3

B72

i3

B38

B134

IGNITION
SWITCH

COMBINATION
METER

i10

SBF-6

6

17

ECM

4

B72

8

MAIN SBF

No.5

16

E

3

1

3

4 5 6

2

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

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

EN(H4SO 2.5)(diag)-46

ENGINE (DIAGNOSTICS)

Malfunction Indicator Light

Step

Check

Yes

No

1

CHECK OPTION CODE.

Is the option code EC, EK, EH,
ER or K4?

Go to step 2.

Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>

NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.

2

CHECK OUTPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground.

Connector & terminal

(B134) No. 17 (+) — Chassis ground (

−

):

Is the voltage less than 1 V?

Go to step 5.

Go to step 3.

3

CHECK POOR CONTACT.
Check for poor connection by shaking or pull-
ing ECM connector and harness.

Does the malfunction indicator
light illuminate?

Repair the poor
contact in ECM
connector.

Go to step 4.

4

CHECK ECM CONNECTOR.
Check the connection of ECM connector.

Is the ECM connector correctly
connected?

Replace the ECM.
<Ref. to FU(H4SO
2.5)-37, Engine
Control Module
(ECM).>

Repair the con-
nection of ECM
connector.

5

CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Remove the combination meter. <Ref. to
IDI-15, Combination Meter.>
3) Disconnect the connector from ECM and
combination meter.
4) Measure the resistance of harness
between ECM and combination meter connec-
tor.

Connector & terminal

(B134) No. 17 — (i10) No. 16:

Is the resistance less than 1
Ω?

Go to step 6.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit of
harness between
ECM and combi-
nation meter con-
nector
• Poor contact in
coupling connector

6

CHECK POOR CONTACT.
Check poor contact in combination meter con-
nector.

Is there poor contact in combi-
nation meter connector?

Repair the poor
contact in combi-
nation meter con-
nector.

Go to step 7.

7

CHECK HARNESS BETWEEN COMBINA-
TION METER AND IGNITION SWITCH CON-
NECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between combination
meter connector and chassis ground.

Connector & terminal

(i10) No. 3 (+) — Chassis ground (

−

):

(i10) No. 4 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Replace the meter

case assembly of
combination
meter. <Ref. to IDI-
15, Combination
Meter.>

Check the follow-
ing and repair if
necessary.

NOTE:
• Blown out fuse
(No. 5)
• Open or short
circuit of harness
between fuse (No.
5) and battery ter-
minal
• Poor contact in
ignition switch con-
nector

EN(H4SO 2.5)(diag)-47

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:
• EC, EK, EH, ER and K4 model

• KA and KS model

NOTE:
Fuel injection system for KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.

EN-03152

BATTERY

3

B72

i3

B38

B134

IGNITION
SWITCH

COMBINATION
METER

i10

SBF-6

6

17

ECM

4

B72

8

MAIN SBF

No.5

16

E

3

1

3

4 5 6

2

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

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

EN(H4SO 2.5)(diag)-48

ENGINE (DIAGNOSTICS)

Malfunction Indicator Light

Step

Check

Yes

No

1

CHECK OPTION CODE.

Is the option code EC, EK, EH,
ER or K4?

Go to step 2.

Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>

NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.

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.

Replace the ECM.
<Ref. to FU(H4SO
2.5)-37, Engine
Control Module
(ECM).>