Subaru Legacy III (2000-2003 year). Service manual — part 111
EN(H4SO)-56
ENGINE (DIAGNOSTICS)
ENGINE MALFUNCTION INDICATOR LAMP (MI)
D: CHECK ENGINE MALFUNCTION INDICATOR LAMP (MI) DOES NOT GO
OFF.
• DIAGNOSIS:
• The CHECK ENGINE malfunction indicator lamp (MI) circuit is shorted.
• TROUBLE SYMPTOM:
• Although MI comes on when engine runs, trouble code is not shown on Subaru select monitor or OBD-
II general scan tool display.
• WIRING DIAGRAM:
EN-01116
LHD MODEL : 10
RHD MODEL : 37
1
*
2
*
3
*
4
*
5
*
LHD MODEL : 11
RHD MODEL : 34
LHD MODEL : 13
RHD MODEL : 36
LHD MODEL : 9
RHD MODEL : 38
LHD MODEL : 12
RHD MODEL : 15
5
*
IGNITION
RELAY
SBF-4
No. 5
SBF-1
4
1
B157
B72
B134
B36
i1
IGNITION
SWITCH
B134
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 31 32 33
34 35
B72
3 4
1 2
BATTERY
28
ECM
COMBINATION
METER
3
i12
A4
i12
1 2 3
4 5 6
7 8 9 10 11 12 13 14
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
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
1
*
2
*
3
*
4
*
EN(H4SO)-57
ENGINE (DIAGNOSTICS)
ENGINE MALFUNCTION INDICATOR LAMP (MI)
Step
Value
Yes
No
1
CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Turn ignition switch to ON.
Does the MI come on?
MI illuminates.
Repair short circuit
in harness
between combina-
tion meter and
ECM connector.
Replace ECM.
<Ref. to
FU(H4SO)-45,
Engine Control
Module.>
EN(H4SO)-58
ENGINE (DIAGNOSTICS)
ENGINE MALFUNCTION INDICATOR LAMP (MI)
E: CHECK ENGINE MALFUNCTION INDICATOR LAMP (MI) DOES NOT BLINK
AT A CYCLE OF 3 HZ.
• DIAGNOSIS:
• The CHECK ENGINE malfunction indicator lamp (MI) circuit is open or shorted.
• Test mode connector circuit is in open.
• TROUBLE SYMPTOM:
• When inspection mode, MI does not blink at a cycle of 3 Hz.
• WIRING DIAGRAM:
EN-01117
1
*
5
*
2
*
3
*
4
*
LHD MODEL : 10
RHD MODEL : 37
1
*
2
*
3
*
4
*
5
*
LHD MODEL : 11
RHD MODEL : 34
LHD MODEL : 13
RHD MODEL : 36
LHD MODEL : 9
RHD MODEL : 38
LHD MODEL : 12
RHD MODEL : 15
SBF-4
No. 5
SBF-1
4
1
B72
IGNITION
SWITCH
BATTERY
B72
3 4
1 2
B75
B76
1
2
1
2
1
1
B75
B76
B22
E3
A28
C3
B136
B134
ECM
16
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
IGNITION
RELAY
B157
B36
i1
COMBINATION
METER
A:
C:
3
i12
A4
i12
1 2 3
4 5 6
7 8 9 10 11 12 13 14
B134
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 31 32 33
34 35
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
B136
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
5
4
6 7
8
2
1
9
3
10
22
23
11 12 13 14 15
24 25
26 27
16 17 18
28 29
19 20
21
30
B136
EN(H4SO)-59
ENGINE (DIAGNOSTICS)
ENGINE MALFUNCTION INDICATOR LAMP (MI)
Step
Value
Yes
No
1
CHECK STATUS OF CHECK ENGINE MAL-
FUNCTION INDICATOR LAMP (MI).
1) Turn ignition switch to OFF.
2) Disconnect test mode connector.
3) Turn ignition switch to ON. (engine OFF)
Does the MI come on?
MI illuminates.
Repair the MI cir-
cuit. <Ref. to
EN(H4SO)-52,
CHECK ENGINE
MALFUNCTION
INDICATOR
LAMP (MI) DOES
NOT COME ON.,
Engine Malfunc-
tion Indicator
Lamp (MI).>
2
CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Turn ignition switch to ON.
Does the MI come on?
MI illuminates.
Repair ground
short circuit in har-
ness between
combination meter
and ECM connec-
tor.
3
CHECK HARNESS BETWEEN TEST MODE
CONNECTOR AND CHASSIS GROUND.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
test mode connector and chassis ground.
Connector & terminal
(B76) No. 1 — Chassis ground:
Is the measured value less than the speci-
fied value?
1
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
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?
There is poor contact.
Repair poor con-
tact in ECM con-
nector.
5
CHECK HARNESS BETWEEN ECM AND
TEST MODE CONNECTOR.
1) Connect test mode connector.
2) Measure resistance of harness between
ECM and chassis ground.
Connector & terminal
(B136) No. 3 — Chassis ground:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in 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?
There is poor contact.
Repair poor con-
tact in ECM con-
nector.
Replace ECM.
<Ref. to
FU(H4SO)-45,
Engine Control
Module.>
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