Subaru Legacy III (2000-2003 year). Service manual — part 112
EN(H4SO)-60
ENGINE (DIAGNOSTICS)
ENGINE MALFUNCTION INDICATOR LAMP (MI)
F: CHECK ENGINE MALFUNCTION INDICATOR LAMP (MI) REMAINS BLINK-
ING AT A CYCLE OF 3 HZ.
• DIAGNOSIS:
• Test mode connector circuit is shorted.
• TROUBLE SYMPTOM:
• MI blinks at a cycle of 3 Hz when ignition switch is turned to ON.
• 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)-61
ENGINE (DIAGNOSTICS)
ENGINE MALFUNCTION INDICATOR LAMP (MI)
Step
Value
Yes
No
1
CHECK TEST MODE CONNECTOR.
1) Disconnect test mode connector.
2) Turn ignition switch to ON.
Does MI flash on and off?
MI illuminates.
System is in good
order.
NOTE:
MI blinks at a cycle
of 3 Hz when test
mode connector is
connected.
2
CHECK HARNESS BETWEEN ECM CON-
NECTOR AND ENGINE GROUNDING TER-
MINAL.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B136) No. 3 — Chassis ground:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Replace ECM.
<Ref. to
FU(H4SO)-45,
Engine Control
Module.>
Repair short circuit
in harness
between ECM and
test mode connec-
tor.
EN(H4SO)-62
ENGINE (DIAGNOSTICS)
DIAGNOSTICS FOR ENGINE STARTING FAILURE
17.Diagnostics for Engine Starting Failure
A: PROCEDURE
1.
Inspection of starter motor circuit. <Ref. to EN(H4SO)-64, STARTER MOTOR CIRCUIT, Diagnostics for Engine Starting Fail-
↓
2.
Inspection of ECM power supply and ground line. <Ref. to EN(H4SO)-68, CONTROL MODULE POWER SUPPLY AND
GROUND LINE, Diagnostics for Engine Starting Failure.>
↓
3.
Inspection of ignition control system. <Ref. to EN(H4SO)-72, IGNITION CONTROL SYSTEM, Diagnostics for Engine Starting
↓
4.
Inspection of fuel pump circuit. <Ref. to EN(H4SO)-76, FUEL PUMP CIRCUIT, Diagnostics for Engine Starting Failure.>
↓
5.
Inspection of fuel injector circuit. <Ref. to EN(H4SO)-80, FUEL INJECTOR CIRCUIT, Diagnostics for Engine Starting Fail-
EN(H4SO)-63
ENGINE (DIAGNOSTICS)
DIAGNOSTICS FOR ENGINE STARTING FAILURE
MEMO:
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