Subaru Legacy IV (2008 year). Service manual — part 123
EN(H4SO)(diag)-95
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
E: DTC P0032 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1)
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-15, DTC P0032 HO2S HEATER CONTROL CIRCUIT
HIGH (BANK 1 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-06835
B137
8
5
6
10 11 12 13 14 15
7
2
1
3
4
16
30
19 20
22
28 29
9
17
18
25
21
23
24
31
26 27
3
4
1
2
5
6
B327
SBF-5
E
E
E
B327
E22
6
4
5
3
2
1
6
4
1
3
B1
B9
B8
C3
C2
A5
D7
D1
D2
D3
36
52
34
35
37
B134
A:
B135
B:
B136
C:
B137
D:
B21
E2
ECM
B21
E2
50
51
3
4
E2
B21
E
E22
B138
B134
B135
A:
B:
B136
C:
D:
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
BATTERY
FRONT OXYGEN
(A/F) SENSOR
A/F, OXYGEN
SENSOR RELAY
B138
*
*
: TERMINAL No. OPTIONAL
ARRANGEMENT
*
3
1
6 5 4
2
5
6
7
2
1
3
4
29
10 11 12 13 14 15
25
24
16
30
9
8
17 18 19
20
28
21 22 23
32
31
26 27
33
34 35
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
3 4
5 6
1 2
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
42
43
36
37
38
39
48
49
50
51
52
53
54
40
41
44
45
46
47
EN(H4SO)(diag)-96
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR.
1) Turn the ignition switch to OFF.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 2 (+) — Chassis ground (–):
(B136) No. 3 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the short
circuit to power in
the harness
between ECM and
front oxygen (A/F)
sensor connector.
Go to step 2.
2
CHECK GROUND CIRCUIT FOR ECM.
1) Disconnect the connectors from ECM.
2) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 5 — Chassis ground:
(B137) No. 1 — Chassis ground:
(B137) No. 2 — Chassis ground:
(B137) No. 3 — Chassis ground:
(B137) No. 7 — Chassis ground:
Is the resistance less than 5
:? Repair the poor
contact of ECM
connector.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and engine
ground
• Poor contact of
coupling connector
EN(H4SO)(diag)-97
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
F: DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2)
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-17, DTC P0037 HO2S HEATER CONTROL CIRCUIT
LOW (BANK 1 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-06836
A5
D1
D2
D3
D7
36
34
35
37
52
ECM
B21
B138
E2
B135
B:
D: B137
C: B136
E
E
A: B134
B137
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
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
B136
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
B135
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
A:
B:
C:
D:
*
*
3
4
1
2
5
6
B327
SBF-5
E
B327
E23
6
4
5
3
2
1
1
B21
E2
50
53
1
19
E2
B21
E
E23
BATTERY
REAR OXYGEN
SENSOR
A/F, OXYGEN
SENSOR RELAY
1
3 4
2
2
3
4
B1
B4
A29
C4
B138
3 4
5 6
1 2
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
42
43
36
37
38
39
48
49
50
51
52
53
54
40
41
44
45
46
47
: TERMINAL No. OPTIONAL
ARRANGEMENT
*
EN(H4SO)(diag)-98
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POWER SUPPLY TO REAR OXY-
GEN SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from rear oxygen
sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between rear oxygen
sensor connector and engine ground.
Connector & terminal
(E23) No. 2 (+) — Engine ground (–):
Is the voltage 10 V or more?
Go to step 2.
Repair the power
supply line. Or
replace the main
relay.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
A/F, oxygen sen-
sor relay connector
and rear oxygen
sensor connector
• Poor contact of
A/F, oxygen sen-
sor relay connector
• Poor contact of
coupling connector
2
CHECK HARNESS BETWEEN ECM AND
REAR OXYGEN SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance between the ECM
and oxygen sensor connector.
Connector & terminal
(B136) No. 4 — (E23) No. 1:
Is the resistance less than 1
:? Go to step 3.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and rear oxy-
gen sensor con-
nector
• Poor contact of
coupling connector
3
CHECK GROUND CIRCUIT FOR ECM.
Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(B134) No. 5 — Chassis ground:
(B137) No. 1 — Chassis ground:
(B137) No. 2 — Chassis ground:
(B137) No. 3 — Chassis ground:
(B137) No. 7 — Chassis ground:
Is the resistance less than 5
:? Go to step 4.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and engine
ground
• Poor contact in
ECM connector
• Poor contact of
coupling connector
4
CHECK REAR OXYGEN SENSOR.
Measure the resistance between rear oxygen
sensor connector terminals.
Terminals
No. 2 — No. 1:
Is the resistance between 5 —
7
:?
Repair the poor
contact of ECM
connector.
Replace the rear
oxygen sensor.
<Ref. to
FU(H4SO)-37,
Rear Oxygen Sen-
sor.>
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