Subaru Legacy III (2000-2003 year). Service manual — part 110
EN(H4SO)-52
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-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)-53
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
(B134) No. 28 (+) — Chassis ground (
−−−−
):
Is the measured value less than the speci-
fied value?
1 V
2
CHECK POOR CONTACT.
Does the MI come on when shaking or pulling
ECM connector and harness?
MI illuminates.
Repair poor con-
tact in ECM con-
nector.
3
CHECK ECM CONNECTOR.
Is ECM connector correctly connected?
Connected.
Replace ECM.
<Ref. to
FU(H4SO)-45,
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
(B134) No. 28 — (i12) No. 12: (LHD
model)
(B134) No. 28 — (i12) No. 15: (RHD
model)
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
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.
EN(H4SO)-54
ENGINE (DIAGNOSTICS)
ENGINE MALFUNCTION INDICATOR LAMP (MI)
6
CHECK HARNESS BETWEEN COMBINA-
TION METER AND IGNITION SWITCH CON-
NECTOR.
1) Turn ignition switch to ON.
2) Measure voltage between combination
meter connector and chassis ground.
Connector & terminal
(i12) No. 3 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Check the follow-
ing and repair if
necessary.
NOTE:
• Broken down
ignition relay.
• Blown out fuse
(No. 5).
• If replaced fuse
(No. 5) blows eas-
ily, check the har-
ness for short
circuit of harness
between fuse (No.
5) and ignition
relay connector.
• Open or short
circuit in harness
between fuse (No.
5) and battery ter-
minal
• Open circuit in
harness between
fuse (No. 5) and
ignition relay con-
nector
• Poor contact in
ignition relay con-
nector
• Poor contact in
ignition switch
connector
7
CHECK LAMP BULB.
Remove engine malfunction indicator lamp
bulb.
Is lamp bulb condition OK?
OK
Repair combina-
tion meter connec-
tor.
Replace lamp
bulb.
Step
Value
Yes
No
EN(H4SO)-55
ENGINE (DIAGNOSTICS)
ENGINE MALFUNCTION INDICATOR LAMP (MI)
MEMO:
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