Subaru Impreza 2004 Service Manual page 201

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CS:DTC P1134 A/F SENSOR MICRO-COMPUTER PROBLEM (BANK1
SENSOR1)
• DTC DETECTING CONDITION:
• Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-39, Inspec-
tion Mode.>.
• WIRING DIAGRAM:
MAIN RELAY
6
4
5
3
2
1
B47
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
LHD 2 LHD
B61 F44
FRONT OXYGEN
(A/F) SENSOR
B18
ECM
B84
B100
F2
EN(H4DOTC)(diag)-280
BATTERY
SBF-5
RHD
RHD
: LHD : RHD
F60 B22
E3
E
Check
Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC P1134?
B18
1 2
3 4
B47
1
3
5
F44
1 2 3 4
5 6 7 8
F60
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B84
1 2 3
4 5
10 11 12 13 14 15 16 17
22 23 24 25 26 27 28
F2
1 2 3 4 5 6
E
12 13 14 15 16 17 18 19 20 21 22 23 24
Yes
Replace the ECM. A temporary poor
<Ref. to contact.
FU(H4DOTC)-49,
Engine Control
Module (ECM).>
2
4
6
: LHD
: RHD
6 7 8 9
18 19 20 21
29 30 31
7 8 9 10 11
EN-01299
No