Subaru IMPREZA 2002 Service Manual page 492

E
Check
Ioes the Subaru Select Moni-
or or OBD-11 general scan tool
ndicate DTC PO303 and
'0304?
Ioes the Subaru Select Moni-
or or OBD-I1 general scan tool
ndicate DTC PO301 and
'0303?
Ioes the Subaru Select Moni-
or
or
OBD-I1 general scan tool
ndicate DTC PO302 and
'0304?
s there a fault in that cylinder?
4re there faults in #I and #2
:ylinders?
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Yes
Go to step 23.
Go to step 24.
Go to step 25.
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
Spark plug
Spark plug cord
Fuel injector
Compression
ratio
Repair or replace
faulty parts.
NOTE:
Check the fol-
lowing items.
Spark plugs
Fuel injectors
Ignition coil
Compres-
sion ratio
If no abnormal is
discovered, check
for "IGNITION
TEM" of
#I
and #2
cylinders side.
<Ref. to
CONTROL SYS-
EN(S0HC)-66,
IGNITION CON-
TROL SYSTEM,
Diagnostics for
Engine Starting
Failure.>
Step
(DTC) ON DISPLAY.
8
CHECK DIAGNOSTIC TROUBLE CODE
9 CHECK DIAGNOSTIC TROUBLE CODE
(DTC) ON DISPLAY.
!O
CHECK DIAGNOSTIC TROUBLE CODE
(DTC) ON DISPLAY.
!1 ONLY ONE CYLINDER
!2
GROUP OF #1 AND #2 CYLINDERS
No
So to step 19.
So to step 20.
So to step 26.
Go to DTC PO170.
<Ref. to
EN(SOHC)-154,
DTC PO171
-
FUEL TRIM MAL-
FUNCTION (NF
Diagnostic Proce-
jure with Diagnos
tic Trouble Code
[DTC).>
So to DTC PO1 70.
<Ref. to
roo
LEAN) -,
EN(S0HC)-154,
DTC PO171
-
FUEL TRIM MAL-
FUNCTION (NF
Diagnostic Proce-
dure with Diagnos
tic Trouble Code
[ DTC).>
roo
LEAN) -,
EN(S0HC)-168