Subaru LEGACY 2006 Manual page 215

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
19 CHECK DTC.
20 CHECK DTC.
21 CHECK DTC.
22 ONLY ONE CYLINDER.
23 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)-178
Yes No
Go to step 24. Go to step 20.
Go to step 25. Go to step 21.
Go to step 26. Go to step 27.
Repair or replace Go to DTC P0171.
faulty parts. <Ref. to
EN(H4SO)(diag)-
NOTE:
154, 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:
154, 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 any fault are
not found, check
the "IGNITION
CONTROL SYS-
TEM" of #1 and #2
cylinders side.
<Ref. to EN(H4SO)
(diag)-62, IGNITION
CONTROL SYS-
TEM, Diagnostics
for Engine Starting
Failure.>