Subaru Legacy III (2000-2003 year). Service manual — part 156
EN(H4SO)-236
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
BC:DTC P0604 — INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY
(RAM) ERROR —
• DTC DETECTING CONDITION:
• Immediately at fault recognition
• TROUBLE SYMPTOM:
• Engine does not start.
• Engine stalls.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-01119
F44
B61
6
RHD
RHD
B9
C21
C23
B1
C12
B2
E3
B22
A7
A35
C26
B21
D14
C19
13
15
14
16
B47
BATTERY
MAIN RELAY
1
2
3
5
6
4
SBF-5
SBF-4
SBF-1
3
1
B72
IGNITION
SWITCH
ECM
B134
A :
B135
B :
B136
C :
B137
D :
C5
8
5 6 7
8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26
27 28
16 17 18 19
20 21
B135
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
B47
3
4
1
2
5
6
B72
3 4
1 2
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
C16
NO. 11
1 2 3 4
5 6 7 8
F44
B136
5 6
7
2
1
9
8
4
3
23
21 22
24
10 11 12 13 14
25 26
15 16 17
18 19 20
B137
4
1
5
3
2
6
18
15
16
7 8 9 10 11
17
19 20
12 13
14
LHD
LHD
: LHD MT MODEL
*
*
EN(H4SO)-237
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Does the Subaru Select Monitor or OBD-II
general scan tool indicate DTC P0604?
DTC P0604 indicated.
Replace ECM.
<Ref. to
FU(H4SO)-45,
Engine Control
Module.>
It is not necessary
to inspect DTC
P0604.
EN(H4SO)-238
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
BD:DTC P0691 — COOLING FAN 1 CONTROL CIRCUIT LOW —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Radiator fan does not operate properly.
• Overheating
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
EN(H4SO)-239
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
• WIRING DIAGRAM:
EN-00736
2
1
4
3
21
22
24
20
8
7
5
9
20A
20A
SUB FAN
RELAY
AIR CONDITIONING RELAY HOLDER
SUB FAN
MOTOR
MAIN FAN
MOTOR
MAIN FAN
RELAY
F28
F16
F66
F27
1
2
F17
B100
F2
B72
1
2
K9
J10
NO. 3
NO. 18
NO. 17
SBF-4
SBF-1
IGNITION
SWITCH
B72
(BLUE)
3 4
1 2
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
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
F28
F66
F27
BATTERY
14
13
B134
ECM
F2
1
2 3 4
5 6 7
9 10 11 12 13 14 15 16
8
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