Subaru Legacy 2003 Service Manual page 565

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
AF:DTC P0304 — CYLINDER 4 MISFIRE DETECTED —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• Immediately at fault recognition (A misfire which could damage catalyst occurs.)
• TROUBLE SYMPTOM:
• Engine stalls.
• Erroneous idling
• Rough driving
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
FUEL INJECTOR
No. 1
E5 E16
E6 E17
1 2
B134
1 2 3 4 5 6
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 31 32 33
LHD
E5 E16
FUEL INJECTOR
No. 2
B47
1 2
3 4
5 6
7 8
34 35
EN(H4SO)-168
6 LHD
B61 F44
B134 ECM
E6
FUEL INJECTOR
No. 3
F44
1 2 3 4
5 6 7 8
BATTERY
SBF-5
B22
E3
E17
FUEL INJECTOR
No. 4
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
EN-01121