Subaru IMPREZA 2004 Service Manual page 394

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
C: 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(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 OUTPUT SIGNAL FROM ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(B136) No. 6 (+) — Chassis ground ( − − − − ):
(B136) No. 17 (+) — Chassis ground ( − − − − ):
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 the voltage more than 8 V?
EN(H4SO)(diag)-85
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
Go to step 2. Go to step 3.
E
EN-01421
No