Subaru Legacy IV (2008 year). Manual - part 113

 

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Subaru Legacy IV (2008 year). Manual - part 113

 

 

EN(H4SO)(diag)-55

Malfunction Indicator Light

ENGINE (DIAGNOSTICS)

16.Malfunction Indicator Light

A: PROCEDURE

1. Activation of malfunction indicator light. <Ref. to EN(H4SO)(diag)-56, ACTIVATION OF MALFUNCTION INDICATOR LIGHT, 
Malfunction Indicator Light.>

p

2. Malfunction indicator light does not come on. <Ref. to EN(H4SO)(diag)-57, MALFUNCTION INDICATOR LIGHT DOES NOT 
COME ON, Malfunction Indicator Light.>

p

3. Malfunction indicator light does not go off. <Ref. to EN(H4SO)(diag)-59, MALFUNCTION INDICATOR LIGHT DOES NOT GO 
OFF, Malfunction Indicator Light.>

p

4. Malfunction indicator light does not blink. <Ref. to EN(H4SO)(diag)-60, MALFUNCTION INDICATOR LIGHT DOES NOT 
BLINK, Malfunction Indicator Light.>

p

5. Malfunction indicator light remains blinking. <Ref. to EN(H4SO)(diag)-62, MALFUNCTION INDICATOR LIGHT REMAINS 
BLINKING, Malfunction Indicator Light.>

EN(H4SO)(diag)-56

Malfunction Indicator Light

ENGINE (DIAGNOSTICS)

B: ACTIVATION OF MALFUNCTION 

INDICATOR LIGHT

1) When the ignition switch is turned to ON (engine
OFF), the malfunction indicator light (A) in the com-
bination meter illuminates.

NOTE:
If the malfunction indicator light does not illuminate,
perform diagnostics of the malfunction indicator
light circuit or the combination meter circuit. <Ref.
to EN(H4SO)(diag)-57, MALFUNCTION INDICA-
TOR LIGHT DOES NOT COME ON, Malfunction
Indicator Light.>

2) After starting the engine, the malfunction indica-
tor light goes out. If it does not go off, either the en-
gine or emission control system has malfunction.

3) If the diagnostic system detects a misfire which
could damage the catalyst, the malfunction indica-
tor light will blink at a cycle of 1 Hz.

4) Turn the ignition switch to OFF and connect the
delivery (test) mode connector.

(1) When the ignition switch is turned to ON
(engine OFF), the malfunction indicator light il-
luminates.
(2) After the engine starts, malfunction indicator
light blinks in a cycle of 0.5 Hz. (During diagno-
sis)
(3) Malfunction indicator light blinks at a cycle of
3 Hz after diagnosis if there is no trouble. Mal-
function indicator light illuminates if faulty.

(1) No faulty

(2) Trouble occurs

(3) ON

(4) OFF

(5) Ignition switch ON

(6) Engine start

CHECK
ENGINE

(A)

EN-05736

EN-01679

(1)

(2)

(5)

(6)

(3)

(4)

(3)

(4)

(1) ON

(2) OFF

(3) Ignition switch ON

(4) Engine start

(5) Misfire start

(6) 1 second

(1) ON

(2) OFF

(3) Ignition switch ON

(4) 1 second

EN-01680

(2)

(1)

(3)

(4)

(5)

(6)

EN-01681

(2)

(1)

(4)

(3)

EN(H4SO)(diag)-57

Malfunction Indicator Light

ENGINE (DIAGNOSTICS)

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 illuminate.
WIRING DIAGRAM:

EN-05697

3

B72

i3

B38

B136

i10

SBF-6

1

11

3

B72

8

MAIN SBF

No.5

16

E

1

3

4 5 6

2

B136

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

16

10 11 12 13 14 15

25

24

30

9

8

7

17 18 19 20
28

21 22 23

29

32

31

1

2

3

4

5

6

27

26

33 34 35

ECM

COMBINATION
METER

IGNITION
SWITCH

BATTERY

EN(H4SO)(diag)-58

Malfunction Indicator Light

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK OUTPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM connec-
tor and chassis ground.

Connector & terminal

(B136) No. 11 (+) — Chassis ground (–):

Is the voltage 10 V or more?

Go to step 5.

Go to step 2.

2

CHECK HARNESS BETWEEN ECM AND 
COMBINATION METER CONNECTOR.
1) Turn the ignition switch to OFF.
2) Remove the combination meter. <Ref. to 
IDI-22, Combination Meter.>
3) Disconnect the connector from ECM and 
combination meter.
4) Measure the resistance of harness between 
ECM and combination meter connector.

Connector & terminal

(B136) No. 11 — (i10) No. 16:

Is the resistance less than 1 

:? Go to step 3.

Repair the harness 
and connector.

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

3

CHECK POOR CONTACT.
Check for poor contact of combination meter 
connector.

Is there poor contact in combi-
nation meter connector?

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

Go to step 4.

4

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 (–):

Is the voltage 10 V or more?

Replace the com-
bination meter 
board. <Ref. to IDI-
22, Combination 
Meter.>

Check the follow-
ing item and repair 
if necessary.

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

5

CHECK POOR CONTACT.
Check for poor connection by shaking or pulling 
ECM harness.

Does the malfunction indicator 
light illuminate?

Repair the poor 
contact of ECM 
connector.

Go to step 6.

6

CHECK ECM CONNECTOR.
Check the connection of ECM connector.

Is the ECM connector correctly 
connected?

Replace the ECM. 
<Ref. to 
FU(H4SO)-39, 
Engine Control 
Module (ECM).>

Repair the connec-
tion of ECM con-
nector.

 

 

 

 

 

 

 

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