Subaru Legacy III (2000-2003 year). Manual — part 314

EN(H6DO)-58

ENGINE (DIAGNOSTICS)

ENGINE MALFUNCTION INDICATOR LAMP (MI)

16.Engine Malfunction Indicator Lamp (MI)

A: PROCEDURE

1.

Activation of check engine malfunction indicator lamp (MI). <Ref. to EN(H6DO)-59, ACTIVATION OF CHECK ENGINE MAL-

FUNCTION INDICATOR LAMP (MI), Engine Malfunction Indicator Lamp (MI).>

↓

2.

Check engine malfunction indicator lamp (MI) does not come on. <Ref. to EN(H6DO)-60, CHECK ENGINE MALFUNCTION

INDICATOR LAMP (MI) DOES NOT COME ON., Engine Malfunction Indicator Lamp (MI).>

↓

3.

Check engine malfunction indicator lamp (MI) does not go off. <Ref. to EN(H6DO)-64, CHECK ENGINE MALFUNCTION

INDICATOR LAMP (MI) DOES NOT GO OFF., Engine Malfunction Indicator Lamp (MI).>

↓

4.

Check engine malfunction indicator lamp (MI) does not blink at a cycle of 3 Hz. <Ref. to EN(H6DO)-66, CHECK ENGINE

MALFUNCTION INDICATOR LAMP (MI) DOES NOT BLINK AT A CYCLE OF 3 HZ., Engine Malfunction Indicator Lamp (MI).>

↓

5.

Check engine malfunction indicator lamp (MI) remains blinking at a cycle of 3 Hz. <Ref. to EN(H6DO)-68, CHECK ENGINE

MALFUNCTION INDICATOR LAMP (MI) REMAINS BLINKING AT A CYCLE OF 3 HZ., Engine Malfunction Indicator Lamp (MI).>

EN(H6DO)-59

ENGINE (DIAGNOSTICS)

ENGINE MALFUNCTION INDICATOR LAMP (MI)

B: ACTIVATION OF CHECK ENGINE

MALFUNCTION INDICATOR
LAMP (MI)

1) When ignition switch is turned to ON (engine
off), the CHECK ENGINE malfunction indicator
lamp (MI) in the combination meter illuminates.

NOTE:
If the MI does not illuminate, perform diagnostics of
the CHECK ENGINE light circuit or the combination
meter circuit. <Ref. to EN(H6DO)-60, CHECK EN-
GINE MALFUNCTION INDICATOR LAMP (MI)
DOES NOT COME ON., Engine Malfunction Indi-
cator Lamp (MI).>

2) After starting the engine, the MI goes out. If it
does not, either the engine or the emission control
system is malfunctioning.

3) If the diagnosis system senses a misfire which
could damage the catalyzer, the MI will blink at a
cycle of 1 Hz.

4) When ignition switch is turned to ON (engine off)
or to “START” with the test mode connector con-
nected, the MI blinks at a cycle of 3 Hz.

(A) Malfunction indicator lamp

EN-01079

( A )

EN-00196

a) No trouble

b) Trouble occurs.

ON

MIL

OFF

ON

ON

MIL

OFF

Ignition
switch

Engine
start

EN-00197

ON

MIL

OFF

ON

Ignition
switch

Engine
start

Misfire
start

1 sec.

EN-00198

ON

MIL

OFF

ON

Ignition
switch

1 sec.

EN(H6DO)-60

ENGINE (DIAGNOSTICS)

ENGINE MALFUNCTION INDICATOR LAMP (MI)

C: CHECK ENGINE MALFUNCTION INDICATOR LAMP (MI) DOES NOT COME

ON.

• DIAGNOSIS:

• The CHECK ENGINE malfunction indicator lamp (MI) circuit is open or shorted.

• TROUBLE SYMPTOM:

• When ignition switch is turned ON (engine OFF), MI does not come on.

• WIRING DIAGRAM:

EN-01080

IGNITION
RELAY

SBF-4

No. 5

SBF-1

A4

4

1

B157

B72

B137

B36

i1

IGNITION
SWITCH

B36

B4 B5 B6

A4 A5 A6

C5 C6

F6

D4 D5 D6

F1

H1

C4

G6

G1

C2

K1

M1 M2

K6

L1

D1 D2

A1 A2
B1 B2

I6

J6

L2

I1

J1

H6

M4 M5 M6

L4 L5 L6

N5 N6

O4 O5 O6

N4

P4 P5

N2

O1 O2

P1 P2

N3

O3

P3

P6

A3

B3

C3

E4 E5 E6

E1 E2

B137

i10

B72

3 4

1 2

BATTERY

15

ECM

B157

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

37
38

1 2

9

3 4

5 6

7 8

COMBINATION
METER

A:

A8
B5

i10

B:

i11

C:

i12

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

LHD : 9
RHD : 38

1

*

2

*

3

*

4

*

5

*

LHD : 13
RHD : 36

LHD : 11
RHD : 34

LHD : 10
RHD : 37

LHD : C11
RHD : B10

1 2 3 4 5 6 7

8 9 10 11 12 13 14

15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

i11

B:

1 2 3 4

5 6 7

8 9 10 11 12 13 14 15 16

C:

A:

i12

1 2 3

8

9 10

4

11 12 13

14 15 16

5 6 7

17 18

5

*

1

*

2

*

3

*

4

*

EN(H6DO)-61

ENGINE (DIAGNOSTICS)

ENGINE MALFUNCTION INDICATOR LAMP (MI)

Step

Value

Yes

No

1

CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM connector

and chassis ground.

Connector & terminal

(B137) No. 15 (+) — Chassis ground (

−−−−

):

Is the measured value less than the speci-
fied value?

1 V

Go to step 4.

Go to step 2.

2

CHECK POOR CONTACT.
Does the MI come on when shaking or pulling
ECM connector and harness?

MI comes on.

Repair poor con-
tact in ECM con-
nector.

Go to step 3.

3

CHECK ECM CONNECTOR.
Is ECM connector correctly connected?

Connected correctly.

Replace ECM.
<Ref. to
FU(H6DO)-46,
Engine Control
Module.>

Repair connection
of ECM connector.

4

CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Remove combination meter. <Ref. to IDI-

14, Combination Meter Assembly.>

3) Disconnect connector from ECM and com-

bination meter.

4) Measure resistance of harness between

ECM and combination meter connector.

Connector & terminal

LHD

(B137) No. 15 — (i12) No. 11:

RHD

(B137) No. 15 — (i11) No. 10:

Is the measured value less than the speci-
fied value?

1

Ω

Go to step 5.

Repair harness
and connector.

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

5

CHECK POOR CONTACT.
Check poor contact in combination meter con-
nector.
Is there poor contact in combination meter
connector?

There is poor contact.

Repair poor con-
tact in combination
meter connector.

Go to step 6.