Subaru Legacy III (2000-2003 year). Service manual — part 324
EN(H6DO)-98
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Start engine, and warm-up the engine.
2) Turn ignition switch to OFF.
3) Disconnect connectors from ECM and front
oxygen (A/F) sensor.
4) Measure resistance of harness between
ECM and front oxygen (A/F) sensor con-
nector.
Connector & terminal
(B137) No. 4 — (E47) No. 1:
(B137) No. 5 — (E47) No. 1:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
2
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
Measure resistance of harness between ECM
and front oxygen (A/F) sensor connector.
Connector & terminal
(B137) No. 19 — (E47) No. 4:
Is the measured value less than the specified
value?
1
Ω
Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
3
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
Measure resistance of harness between ECM
and front oxygen (A/F) sensor connector.
Connector & terminal
(B137) No. 29 — (E47) No. 3:
Is the measured value less than the specified
value?
1
Ω
Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
4
CHECK FRONT OXYGEN (A/F) SENSOR.
Measure resistance between front oxygen (A/
F) sensor connector terminals.
Terminals
No. 2 — No. 1:
Is the measured value less than the specified
value?
5
Ω
Replace front oxy-
gen (A/F) sensor.
<Ref. to
FU(H6DO)-43,
Front Oxygen (A/
F) Sensor.>
5
CHECK POOR CONTACT.
Check poor contact in ECM and front oxygen
(A/F) sensor connector.
Is there poor contact in ECM or front oxygen
(A/F) sensor connector?
There is poor contact.
Repair poor con-
tact in ECM or
front oxygen (A/F)
sensor connector.
Replace front oxy-
gen (A/F) sensor.
<Ref. to
FU(H6DO)-43,
Front Oxygen (A/
F) Sensor.>
EN(H6DO)-99
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
EN(H6DO)-100
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
B: DTC P0031 — HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)
—
• DTC DETECTING CONDITION:
• Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
EN(H6DO)-101
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
• WIRING DIAGRAM:
EN-01087
BATTERY
F44
B61
SBF-5
6
B47
MAIN RELAY
1
2
3
5
4
6
9
8
21
31
2
1
5
B252
E49
ECM
18
29
19
5
4
7
6
20
30
4
1
3
FRONT
OXYGEN
(A/F)
SENSOR RH
E47
2
4
3
1
FRONT
OXYGEN
(A/F)
SENSOR LH
E24
B137
E3
B22
B83
11
8
1
2
3
E2
B21
2
3
E2
B21
20
19
E49
B252
4
8
LHD
RHD
LHD
RHD
B252
B47
3
4
5
6
1
2
E24
E47
B137
1
2
7
8
9
5
6
3
4
10 11 12
19 20 21
29 30 31
13 14 15 16 17
27 28
18
22 23 24 25 26
1 2 3 4
5 6 7 8
3
4
1
2
1 2 3 4
5 6 7 8
F44
B21
1 2
5
6 7
8
13
14 15
16
9 10
11 12
3 4
17 18
19 20
B83
1 2 3 4
5 6 7 8 9 10
11 12
19
20
13 14 15 16 17 18
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