Subaru Impreza 2003 Service Manual page 1265

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
E: DTC P0032 — HO2S HEATER CONTROL CIRCUIT HIGH (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(H4DOTC)-48, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>.
• WIRING DIAGRAM:
MAIN RELAY
6
4
5
3
2
1
B47
Step
1 CHECK OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(B84) No. 4 (+) — Chassis ground ( − − − − ):
(B84) No. 5 (+) — Chassis ground ( − − − − ):
LHD LHD
2
B61 F44
FRONT OXYGEN
(A/F) SENSOR
B18
ECM
B84
B100
F2
EN(H4DOTC)-89
BATTERY
SBF-5
RHD
RHD
F60 : LHD B22 : RHD
E3
E
Check
Is the voltage more than 8 V?
ENGINE (DIAGNOSTICS)
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
Go to step 3. Go to step 2.
2
4
6
: LHD
: RHD
6 7 8 9
18 19 20 21
29 30 31
7 8 9 10 11
EN-01299
No