Subaru 2009 IMPREZA Service Manual page 572
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Also See for 2009 IMPREZA:
- Owner's manual (407 pages) ,
- Manual (248 pages) ,
- Service bulletin (2 pages)
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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AG:DTC P0138 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2)
DTC DETECTING CONDITION:
• Detected when two consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION<Ref. to GD(H4SO)-56, DTC P0138 O2 SENSOR CIRCUIT HIGH VOLTAGE
(BANK 1 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-55,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-44, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
A/F, OXYGEN
SENSOR RELAY
9
50
10
B21
11
12
B220
FUSE
B220
(RELAY BLOCK)
2
1
E2
REAR
OXYGEN SENSOR
E23
E2
B21
B138
A: B134
B:
B135
ECM
C: B136
D: B137
B21
E2
*
E
E
EN(H4SO)(diag)-155
BATTERY
SBF-5
E
E
*
*
: TERMINAL No. OPTIONAL
ARRANGEMENT AMONG 1, 2, 5 AND 6
ENGINE (DIAGNOSTICS)
B138
E23
1
2
1 2
3 4
3 4
5 6
7 8
B21
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
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
A:
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
B:
B135
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
C:
B136
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
D:
B137
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
B220
1
2
9
13
17
21
10
14
18
22
3
4
11 12
15 16
19
20
23
24
5
6
7
8
25
29
33
37
26
30
34
38
27
28
31
32
35
36
39
40
EN-07193
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