Subaru IMPREZA 2004 Service Manual page 68

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AG: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)(diag)-47,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-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
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29
LHD
E5 E16
FUEL INJECTOR
No. 2
B47
1 2
3 4
5 6
5 6 7 8
30 31 32 33 34 35
EN(H4SO)(diag)-145
2
LHD
B61 F44
ECM
B134
E6
FUEL INJECTOR
No. 3
F44
1 2 3 4
5 6 7 8
ENGINE (DIAGNOSTICS)
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
E
EN-01428