Subaru LEGACY 2006 Manual page 216

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
24 GROUP OF #3 AND #4 CYLINDERS.
25 GROUP OF #1 AND #3 CYLINDERS.
26 GROUP OF #2 AND #4 CYLINDERS.
27 CYLINDER AT RANDOM.
Check
Are there any faults in #3 and
#4 cylinders?
Are there any faults in #1 and
#3 cylinders?
Are there any faults in #2 and
#4 cylinders?
Is the engine idle rough?
EN(H4SO)(diag)-179
ENGINE (DIAGNOSTICS)
Yes No
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
• If any fault are
(DTC).>
not found, check
the "IGNITION
CONTROL SYS-
TEM" of #3 and #4
cylinders side.
<Ref. to EN(H4SO)
(diag)-62, IGNI-
TION CONTROL
SYSTEM, Diag-
nostics for Engine
Starting Failure.>
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-
• Fuel injector
dure with Diagnos-
• Skipping timing
tic Trouble Code
belt teeth
(DTC).>
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-
• Fuel injector
dure with Diagnos-
• Compression ra-
tic Trouble Code
tio
(DTC).>
• Skipping timing
belt teeth
Go to DTC P0171. Repair or replace
<Ref. to faulty parts.
EN(H4SO)(diag)-
NOTE:
154, DTC P0171
Check the follow-
SYSTEM TOO
ing items.
LEAN (BANK 1),
• Spark plug
Diagnostic Proce-
• Fuel injector
dure with Diagnos-
• Compression ra-
tic Trouble Code
tio
(DTC).>