Subaru Legacy III (2000-2003 year). Manual — part 340

EN(H6DO)-162

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

W: 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(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.

EN(H6DO)-163

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

EN(H6DO)-164

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?

Another DTC is displayed.

Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H6DO)-89, List
of Diagnostic
Trouble Code
(DTC).>

NOTE:
In this case, it is
not necessary to
inspect DTC
P0133.

Go to step 2.

2

CHECK 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 (RH side)
• Damage of exhaust pipe resulting in a hole
Is there a fault in exhaust system?

There is a malfunction.

Repair exhaust
system.

Replace front oxy-
gen (A/F) sensor.
<Ref. to
FU(H6DO)-43,
Front Oxygen (A/
F) Sensor.>

EN(H6DO)-165

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO: