Subaru IMPREZA GD 2007 Series Manual page 278

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
17 CHECK DTC.
18 CHECK DTC.
19 CHECK DTC.
20 ONLY ONE CYLINDER.
21 GROUP OF #1 AND #2 CYLINDERS.
Check
Are DTCs P0303 and P0304
displayed on the Subaru Select
Monitor or general scan tool?
Are DTCs P0301 and P0303
displayed on the Subaru Select
Monitor or general scan tool?
Are DTCs P0302 and P0304
displayed on the Subaru Select
Monitor or general scan tool?
Is there any fault in the cylin-
der?
Are there any faults in #1 and
#2 cylinders?
EN(H4SO)(diag)-169
ENGINE (DIAGNOSTICS)
Yes No
Go to step 22. Go to step 18.
Go to step 23. Go to step 19.
Go to step 24. Go to step 25.
Repair or replace Go to DTC P0171.
faulty parts. <Ref. to
EN(H4SO)(diag)-
NOTE:
146, DTC P0171
Check the follow-
SYSTEM TOO
ing items.
LEAN (BANK 1),
• Spark plug
Diagnostic Proce-
• Spark plug cord
dure with Diagnos-
• Fuel injector
tic Trouble Code
• Compression ra-
(DTC).>
tio
Repair or replace Go to DTC P0171.
faulty parts. <Ref. to
EN(H4SO)(diag)-
NOTE:
146, DTC P0171
• Check the fol-
SYSTEM TOO
lowing items.
LEAN (BANK 1),
• Spark plug
Diagnostic Proce-
• Fuel injector
dure with Diagnos-
• Ignition coil
tic Trouble Code
• Compression
(DTC).>
ratio
• If no fault is
found, check the
"IGNITION CON-
TROL SYSTEM" of
#1 and #2 cylin-
ders side. <Ref. to
EN(H4SO)(diag)-
64, IGNITION
CONTROL SYS-
TEM, Diagnostics
for Engine Starting
Failure.>