Subaru IMPREZA 2002 Service Manual page 488

I I
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENG
I NE
(DIAGNOSTICS)
AI: DTC PO304
-
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(S0HC)-43, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(S0HC)-40, OPERATION, Inspec-
tion Mode.>.
WIRING DIAGRAM:
A:@
C:@ECM
I
e Y
*
c r
I I
3 -
I
r O )
1z1
r
I !
-
-
FUELINJECTOR FUEL INJECTOR FUEL INJECTOR FUEL INJECTOR
No.1
No.2
No.3 No.4
C:@ A @
EN1
EN(S0HC)-164