Subaru Legacy 2004 Service Manual page 567

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AD: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 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, OPER-
ATION, Inspection Mode.>.
WIRING DIAGRAM:
MAIN RELAY
5
3
6
4
2
1
B47
FUEL INJECTOR
No. 1
E5 E16
E6 E17
1 2
E5 E16
FUEL INJECTOR
No. 2
B47
1 2
1 2 3 4
12 13 14 15
3 4
23 24 25 26 27 28 29 30 31 32 33
5 6
34 35
42 43
48
EN(H4SO 2.0)(diag)-135
SBF-8
ECM
B134
E6
FUEL INJECTOR
No. 3
B21
5 6 7 8 9 10 11
16 17 18 19 20 21 22
36 37 38 39 40 41
44 45 46 47
49 50 51 52 53 54
ENGINE (DIAGNOSTICS)
BATTERY
B21
E2
E17
FUEL INJECTOR
No. 4
B134
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 27
28 29 30 31 32 33 34
E
EN-02432