Subaru Legacy III (2000-2003 year). Service manual — part 343
EN(H6DO)-174
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AA:DTC P0139 — O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR
2) —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
• WIRING DIAGRAM:
EN-01088
BATTERY
F44
B61
6
T5
B19
B47
MAIN RELAY
2
1
3
5
4
6
F44
1 2 3 4
5 6 7 8
C13
B17
B19
B26
D21
D31
D9
D8
REAR
OXYGEN
SENSOR
5
3
6
4
1
3
4
2
1
5
B252
B83
B19
T5
T6
E49
B47
T6
B136
C:
D:
B135
B:
3
4
5
6
1
2
5
7
ECM
B135
B:
B136
C:
B137
D:
3
4
1
2
1 2
7
8 9
5
6
3
4
10 11 12
19 20 21
13 14 15 16
17 18
22 23 24
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
B137
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
RHD
LHD
LHD
RHD
B252
1 2 3 4
5 6 7 8
B19
4
1 2 3
6
5
2
B83
1 2 3 4
5 6 7 8 9 10
11 12
19
20
13 14 15 16 17 18
EN(H6DO)-175
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
Another DTC is displayed.
Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H6DO)-89, List
of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0139.
Replace rear oxy-
gen sensor. <Ref.
to FU(H6DO)-45,
Rear Oxygen Sen-
sor.>
EN(H6DO)-176
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AB:DTC P0150 — O2 SENSOR CIRCUIT (BANK 2 SENSOR 1) —
• DTC DETECTING CONDITION:
• Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
EN(H6DO)-177
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
• WIRING DIAGRAM:
EN-01087
BATTERY
F44
B61
SBF-5
6
B47
MAIN RELAY
1
2
3
5
4
6
9
8
21
31
2
1
5
B252
E49
ECM
18
29
19
5
4
7
6
20
30
4
1
3
FRONT
OXYGEN
(A/F)
SENSOR RH
E47
2
4
3
1
FRONT
OXYGEN
(A/F)
SENSOR LH
E24
B137
E3
B22
B83
11
8
1
2
3
E2
B21
2
3
E2
B21
20
19
E49
B252
4
8
LHD
RHD
LHD
RHD
B252
B47
3
4
5
6
1
2
E24
E47
B137
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
1 2 3 4
5 6 7 8
3
4
1
2
1 2 3 4
5 6 7 8
F44
B21
1 2
5
6 7
8
13
14 15
16
9 10
11 12
3 4
17 18
19 20
B83
1 2 3 4
5 6 7 8 9 10
11 12
19
20
13 14 15 16 17 18
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