Subaru 2002 IMPREZA Service Manual page 592

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
AC: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-49, OPERATION,
Clear Memory Mode.> and Inspection Mode <Ref. to EN-42, OPERATION, Inspection Mode.> .
• WIRING DIAGRAM:
MAIN RELAY
4
6
5
3
2
1
B47
FUEL INJECTOR
No.1
E5 E16
E6 E17
1 2
C:
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 27 28 29
A:
B134
E5 E16
FUEL INJECTOR
No.2
B47
1 2
3 4
5 6
A:
B134
1 2 3 4 5 6
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
30 24 25 26 27 28 29 30 31 32 33
SBF-5
LHD 2 LHD
B61 F44
C: ECM
B136
E6
FUEL INJECTOR FUEL INJECTOR
No.3
F44
1 2 3 4
5 6 7 8
7 8
34 35
EN-160
BATTERY
B22
E3
E17
No.4
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
EN0866