Subaru IMPREZA 2004 Service Manual page 443

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Y: DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (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(H4SO)(diag)-47,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, OPERATION,
Inspection Mode.>.
• WIRING DIAGRAM:
MAIN RELAY
6
4
5
3
2
1
B47
B19
B22
1 2 3 4
2
1
5 6 7 8
4
3
9 10 11 12
B47
13 14 15 16
1
2
3
4
5
6
LHD
OXYGEN SENSOR
B:
B135
C: B136
D: B137
F44
1 2 3 4
5 6 7 8
B137
1
2
3
4
5
6
7 8 9 10 11
12 13
14
15
16
17
18
19 20
EN(H4SO)(diag)-134
B61
F44
2
LHD
REAR
B19
ECM
B22
E3
E
B83
: RHD
1 2 3 4
B83
: LHD
1
2
1
2
3
7
8
4 5 6
18
19
20
BATTERY
SBF-5
*
1
B83
LHD : 5
*
RHD : 4
2
3
1
8
9
10
11 12 13 14 15
B136
20 21
22 23
3
4
5
6
9
10 11
12 13
14
15
16 17
21
22
23
24
25
26
E
B135
4
5 6 7
16 17 18 19
24
25
26
27 28
EN-01422

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