Subaru Impreza 2004 Service Manual page 77

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
AL: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(H4DOTC)(diag)-
47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-39, Inspec-
tion Mode.>.
EN(H4DOTC)(diag)-156