Subaru Legacy (2005 year). Service manual — part 333
EN(H4DOTC)(diag)-101
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
P: DTC P0132 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 1)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
37, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-30, PROCE-
DURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-03522
SBF-5
B47
1
2
4
6
3
5
E
E
B21
F2
54
A6
A7
A2
A3
A26
A33
A25
ECM
B134
3
1
4
2
B18
3 4
1 2
3
4
1
2
5
6
B21
B47
B18
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
MAIN RELAY
FRONT OXYGEN
(A/F) SENSOR
BATTERY
A:
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
A:
EN(H4DOTC)(diag)-102
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Turn the ignition switch to ON.
2) Disconnect the connector from front oxygen
(A/F) sensor.
3) Measure the voltage of harness between
ECM connector and chassis ground.
Connector & terminal
(B134) No. 26 (+) — Chassis ground (
−
):
(B134) No. 33 (+) — Chassis ground (
−
):
Is the voltage more than 8 V?
Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4DOTC)-32,
Front Oxygen (A/
F) Sensor.>
Repair the battery
short circuit of har-
ness between
ECM and front
oxygen (A/F) sen-
sor connector.
EN(H4DOTC)(diag)-103
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Q: DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SEN-
SOR 1)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
37, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-30, PROCE-
DURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-03522
SBF-5
B47
1
2
4
6
3
5
E
E
B21
F2
54
A6
A7
A2
A3
A26
A33
A25
ECM
B134
3
1
4
2
B18
3 4
1 2
3
4
1
2
5
6
B21
B47
B18
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
MAIN RELAY
FRONT OXYGEN
(A/F) SENSOR
BATTERY
A:
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
A:
EN(H4DOTC)(diag)-104
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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.
3) Measure the resistance of harness
between ECM and front oxygen (A/F) sensor
connector.
Connector & terminal
(B134) No. 26 — (B18) No. 1:
(B134) No. 33 — (B18) No. 2:
Is the resistance less than 1
Ω?
Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4DOTC)-32,
Front Oxygen (A/
F) Sensor.>
Repair the open
circuit of harness
between ECM and
front oxygen (A/F)
sensor connector.
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