Subaru 2009 IMPREZA Service Manual page 1434
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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)
BJ:DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)
DTC DETECTING CONDITION:
• Detected when two consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-111, DTC P0420 CATALYST SYSTEM EFFICIENCY
BELOW THRESHOLD (BANK 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Engine stalls.
• Idle mixture is out of specifications.
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-54,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PROCE-
DURE, Inspection Mode.>.
WIRING DIAGRAM:
A/F, OXYGEN
SENSOR RELAY
9
10
11
12
B220
A:
B:
C:
D:
FUSE
B220
(RELAY BLOCK)
15A
SBF-5
2
1
B19
T5
REAR
OXYGEN SENSOR
T6
T5
B83
B19
*
*
*
*
B138
B134
B135
ECM
B136
B137
B21
*
: TERMINAL No. OPTIONAL ARRANGEMENT
E2
E
EN(H4DOTC)(diag)-213
BATTERY
1
3
E
5
7
34
42
ENGINE (DIAGNOSTICS)
B19
B83
T6
B138
1 2
1 2 3 4
3 4
5 6 7 8
B220
2
9
13
17
21
10
14
18
22
4
11 12
15 16
19
20
23
24
6
8
25
29
33
37
26
30
34
38
27
28
31
32
35
36
39
40
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
35
36
37
38
39
40
41
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
EN-07197
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