Subaru Legacy 2004 Service Manual page 886

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
T: 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, conduct Clear Memory Mode <Ref. to EN(H4SO 2.5)(diag)-
41, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-34, Inspection Mode.>.
WIRING DIAGRAM:
• EC, EK and K4 model
OXYGEN (A/F)
SENSOR RELAY
6
4
5
B21
3
2
1
B327
• KA and KS model
NOTE:
Fuel injection system for KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.
SBF-6
50
E2
FRONT OXYGEN
(A/F) SENSOR
E24
ECM
B134
E
EN(H4SO 2.5)(diag)-127
BATTERY
E2
B21
E
B21
E2
ENGINE (DIAGNOSTICS)
B327
1 2
3 4
5 6
E24
1 2 3
4 5 6
B21
1 2 3 4 5 6 7 8
12 13 14 15 16 17 18 19
23 24 25 26 27 28 29 30 31 32 33
34 35 36 37 38
42 43 44 45
48 49 50 51 52
B134
1 2 3 4 5
8 9 10 11 12 13 14 15
18 19 20 21 22 23 24
28 29
30 31 32
E
9 10 11
20 21 22
39 40 41
46 47
53 54
6 7
16 17
25 26 27
33 34
EN-01992