Subaru Legacy III (2000-2003 year). Service manual — part 134
EN(H4SO)-148
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
V: DTC P0133 — O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1)
—
• 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)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-01144
F44
B61
6
RHD
RHD
BATTERY
SBF-5
B47
MAIN RELAY
1
2
3
5
4
6
F44
1 2 3 4
5 6 7 8
C16
C5
4
8
B22
E3
ECM
C6
C17
C22
C13
B23
3
2
1
FRONT OXYGEN
(A/F) SENSOR
B18
B135
B:
B136
C:
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B47
3
4
5
6
1
2
B136
5 6
7
2
1
9
8
4
3
23
21 22
24
10 11 12 13 14
25 26
15 16 17
18 19 20
B18
4
2 1
3
LHD
LHD
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
B135
EN(H4SO)-149
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
DTC indicated.
Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0133.
2
CHECK EXHAUST SYSTEM.
Is there a problem in exhaust system?
NOTE:
Check the following items.
•Loose installation of front portion of exhaust
pipe onto cylinder heads
•Loose connection between front exhaust pipe
and front catalytic converter
•Damage of exhaust pipe resulting in a hole
There is a problem.
Repair exhaust
system.
Replace front oxy-
gen (A/F) sensor.
<Ref. to
FU(H4SO)-41,
Front Oxygen (A/
F) Sensor.>
EN(H4SO)-150
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
W: DTC P0134 — O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (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(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-01144
F44
B61
6
RHD
RHD
BATTERY
SBF-5
B47
MAIN RELAY
1
2
3
5
4
6
F44
1 2 3 4
5 6 7 8
C16
C5
4
8
B22
E3
ECM
C6
C17
C22
C13
B23
3
2
1
FRONT OXYGEN
(A/F) SENSOR
B18
B135
B:
B136
C:
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B47
3
4
5
6
1
2
B136
5 6
7
2
1
9
8
4
3
23
21 22
24
10 11 12 13 14
25 26
15 16 17
18 19 20
B18
4
2 1
3
LHD
LHD
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
B135
EN(H4SO)-151
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) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and front
oxygen (A/F) sensor connector.
3) Measure resistance of harness between
ECM and front oxygen (A/F) sensor con-
nector.
Connector & terminal
(B136) No. 13 — (E18) No. 1:
(B136) No. 22 — (B18) No. 2:
Is the measured value less than the speci-
fied value?
1
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and fornt
oxygen (A/F) sen-
sor connector
• Poor contact in
front oxygen (A/F)
sensor connector
• Poor contact in
ECM connector
2
CHECK POOR CONTACT.
Chack poor contact in front oxygen (A/F) sen-
sor connector.
Is there poor contact in front oxygen (A/F) sen-
sor connector?
There is poor contact.
Repair poor con-
tact in front oxygen
(A/F) sensor con-
nector.
Replace front oxy-
gen (A/F) sensor.
<Ref. to
FU(H4SO)-41,
Front Oxygen (A/
F) Sensor.>
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