Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 233
EN(H4DOTC)(diag)-156
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
• Models with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine Electrical System.>
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
front oxygen (A/F) sensor connector.
3) Measure the resistance of harness between
ECM connector and front oxygen (A/F) sensor
connector.
Connector & terminal
Models without SI-DRIVE
(B136) No. 19 — (E22) No. 1:
(B136) No. 18 — (E22) No. 3:
Models with SI-DRIVE
(B136) No. 19 — (B379) No. 4:
(B136) No. 18 — (B379) No. 3:
Is the resistance less than 1 Ω? Go to step
Repair the open
circuit of harness
between ECM con-
nector and front
oxygen (A/F) sen-
sor connector.
ECM
B138
6
4 5
3
2
1
1
2
3
4
B220
13
14
15 16
17
27
24
25
26
20
21
22
23
29
30
31
28
32 35
33
34
37
38
39
36
40
8
9
10
11 12
1
2
5
3
4
7
6
19
18
2
1
B220
15A
9
10
11
12
B220
D:
5
6
7
8
2
1
9
4
3
10
22 23
11 12 13 14 15
24 25
26
16 17
18 19 20 21
27
28 29
30 31
B137
C: B136
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
*
*
*
B138
D1
36
D3
A4
40
34
35
B21
E2
A6
A3
A:
54
52 53
50 51
48 49
46 47
45
44
42 43
40 41
38 39
36 37
34 35
33
32
31
30
29
28
27
26
25
24
23
22
21
20
11
10
9
19
18
17
16
8
7
6
5
15
14
13
12
4
3
2
1
D: B137
C: B136
A:
31
30
32
29
34
33
21
20
19
18
17
16
28
27
26
15
14
13
12
11
25
23
22
24
10
3
4
9
1
2
8
7
6
5
B134
B379
B21
B379
4
2
3
1
B134
C9
C19
C1
8
C6
C5
EN-08721
SBF-5
E
E
FRONT OXYGEN (A/F)
SENSOR
BATTERY
: TERMINAL No. OPTIONAL ARRANGEMENT
A/F, OXYGEN SENSOR
RELAY
FUSE
(RELAY BLOCK)
EN(H4DOTC)(diag)-157
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
2
CHECK FOR POOR CONTACT.
Check for poor contact of ECM and front oxy-
gen (A/F) sensor connector.
Is there poor contact of ECM or
front oxygen (A/F) sensor con-
nector?
Repair the poor
contact of ECM or
front oxygen (A/F)
sensor connector.
Step
Check
Yes
No
EN(H4DOTC)(diag)-158
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
AG:DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)
DTC DETECTING CONDITION:
• Detected when 2 consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-73, DTC P0137 O2 SENSOR CIRCUIT LOW VOLT-
AGE (BANK 1 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-63,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-
WIRING DIAGRAM:
• Models without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM, Engine Electrical
ECM
6
4 5
3
2
1
*
2
1
B220
15A
9
10
11
12
B220
*
*
1 2
3 4
D1
36
A4
40
34
35
B21
E2
D3
A6
A3
B220
13
14
15 16
17
27
24
25
26
20
21
22
23
29
30
31
28
32 35
33
34
37
38
39
36
40
8
9
10
11 12
1
2
5
3
4
7
6
19
18
B134
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
33 34
29
32
30 31
A:
D: B137
C: B136
B: B135
A:
T6
B134
C9
B30
C20
B6
*
*
B21
1 2 3 4
12 13 14 15
5 6 7 8
16 17 18 19
9 10 11
20 21 22
23 24 25 26 27 28 29 30 31 32 33
35
34
37
36
39
38
41
40
43
42
44 45
47
46
49
48
51
50
53
52
54
4
1
3
4
1
3
B19
T5
22
T5
B19
5
6
7
8
2
1
9
4
3
10
22 23
11 12 13 14 15
24 25
26
16 17
18 19 20 21
27
28 29
30 31
B135
B:
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
29 30 31
32 33
34 35
B136
C:
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
33 34
29
32
30
31
35
D: B137
B19
T6
B83
B138
B138
B83
EN-08722
E
E
SBF-5
BATTERY
: TERMINAL No. OPTIONAL ARRANGEMENT
REAR
OXYGEN SENSOR
A/F, OXYGEN SENSOR
RELAY
FUSE
(RELAY BLOCK)
EN(H4DOTC)(diag)-159
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
• Models with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine Electrical System.>
Step
Check
Yes
No
1
CHECK REAR OXYGEN SENSOR DATA.
1) Warm up the engine until engine coolant
temperature is higher than 75°C (167°F), and
keep the engine speed at 3,000 rpm. (2 minutes
maximum)
2) Read the value of «Rear O2 Sensor» using
the Subaru Select Monitor or a general scan
tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-40, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.
Is the value of «Rear O2 Sen-
sor» 0.490 V or more?
ECM
6
4 5
3
2
1
*
2
1
B220
15A
9
10
11
12
B220
*
*
1 2
3 4
D1
36
D3 A4
40
34
35
B21
E2
A6
A3
B220
13
14
15 16
17
27
24
25
26
20
21
22
23
29
30
31
28
32 35
33
34
37
38
39
36
40
8
9
10
11 12
1
2
5
3
4
7
6
19
18
B134
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
33 34
29
32
30 31
A:
D: B137
C: B136
B: B135
A:
T6
B134
C9
B30
C20
B6
*
*
B21
1 2 3 4
12 13 14 15
5 6 7 8
16 17 18 19
9 10 11
20 21 22
23 24 25 26 27 28 29 30 31 32 33
35
34
37
36
39
38
41
40
43
42
44 45
47
46
49
48
51
50
53
52
54
4
1
3
4
1
3
B19
T5
22
T5
B19
5
6
7
8
2
1
9
4
3
10
22 23
11 12 13 14 15
24 25
26
16 17
18 19 20 21
27
28 29
30 31
B135
B:
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
29 30 31
32 33
34 35
B136
C:
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
33 34
29
32
30
31
35
D: B137
B19
T6
B83
B138
B138
B83
EN-08723
SBF-5
E
E
BATTERY
: TERMINAL No. OPTIONAL ARRANGEMENT
REAR
OXYGEN SENSOR
A/F, OXYGEN SENSOR
RELAY
FUSE
(RELAY BLOCK)
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