Subaru IMPREZA 2004 Service Manual page 158

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BX:DTC P1137 O2 SENSOR CIRCUIT (LAMDA=1) (BANK1 SENSOR1)
• DTC DETECTING CONDITION:
• Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, OPERATION,
Inspection Mode.>.
WIRING DIAGRAM:
MAIN RELAY
6
4
5
3
2
1
B47
B18
B47
1 2
2 1
3 4
4 3
5 6
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
LHD
B61
FRONT OXYGEN
(A/F) SENSOR
B18
B:
B135
ECM
C:
B136
B22
E
F44 B22
1 2 3 4
1 2 3 4
5 6 7 8
5 6 7 8
9 10 11 12
13 14 15 16
Is any other DTC displayed?
EN(H4SO)(diag)-235
SBF-5
2
LHD
F44
E3
B136
1 2 3 4 5 6
7 8 14 15
9 10 11 12 13 16 17
18 19 20 21 22 23 24 25 26
Check
ENGINE (DIAGNOSTICS)
BATTERY
B135
1 2 3 4 5 6 7
8 9 10 11 12 13 14 15 16 17 18 19
22 23 24 25 26 27 28
20 21
Yes
Inspect DTC using Go to step 2.
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H4SO)(diag)-
74, List of Diag-
nostic Trouble
Code (DTC).>
E
EN-01421
No