Subaru LEGACY 2006 Manual page 211

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
AW:DTC P0304 CYLINDER 4 MISFIRE DETECTED
DTC DETECTING CONDITION:
• Detected when two consecutive driving cycles with fault occur.
• Immediately at fault recognition (A misfire which could damage catalyst occurs.)
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-101, DTC P0304 CYLINDER 4 MISFIRE DETECTED, Di-
agnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Engine stalls.
• Erroneous idling
• Rough driving
CAUTION:
After repairing or replacing the defective part, perform the Clear Memory Mode <Ref. to EN(H4SO)(di-
ag)-43, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-34, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
MAIN RELAY
5
3
6
4
2
1
B47
FUEL INJECTOR
No. 1
E5 E16
E6 E17
1 2
B137
E5 E16
FUEL INJECTOR FUEL INJECTOR
No. 2
B47 B21
1 2
1 2 3 4 5 6 7 8
3 4
12 13 14 15 16 17 18 19
5 6
23 24 25 26 27 28 29 30 31 32 33
34 35 36 37
42 43 44 45
48 49 50 51
EN(H4SO)(diag)-174
SBF-7
ECM
B21
E2
E6 E17
FUEL INJECTOR
No. 4
No. 3
B137
1 2 3 4
9 10 11
8 9 10 11 12 13 14 15
20 21 22
18 19 20 21 22 23
26 27 28 29
38 39 40 41
46 47
52 53 54
BATTERY
E
5 6 7
16 17
24 25
30 31
EN-04037