Subaru Legacy 2003 Service Manual page 487

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
19.Diagnostic Procedure with Diagnostic Trouble Code (DTC)
A: DTC P0030 — HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1) —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-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
LHD
FRONT OXYGEN
( A/F ) SENSOR
B18
B: B135
C: B136
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
EN(H4SO)-90
SBF-5
LHD
6
B61 F44
ECM
B22
E3
B136
1 2 3 4 5 6
7 8 9 10 11 12 13 14 15 16 17
18 19 20 21 22 23 24 25 26
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
EN-01144