Spark Plug - Subaru LEGACY 2006 Manual

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
13 CHECK STATUS OF MALFUNCTION INDI-
CATOR LIGHT.
1) Clear the memory using Subaru Select
Monitor.
<Ref. to EN(H4SO)(diag)-43, Clear Memory
Mode.>
2) Start the engine, and drive the vehicle more
than 10 minutes.
14 CHECK CAUSE OF MISFIRE.
15 CHECK POOR CONTACT.
16 CHECK AIR INTAKE SYSTEM.
17 CHECK MISFIRE SYMPTOM.
1) Turn the ignition switch to ON.
2) Read the DTC.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO)(diag)-26, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
• Perform the diagnosis according to following
items.
18 CHECK DTC.
Check
Does the malfunction indicator
light illuminate or blink?
Has the cause of misfire been
detected while running the
engine?
Ex.: Disconnection of spark
plug cord
Is there poor contact in the
ignition coil, fuel injector, ECM
and coupling connector?
Is there any fault in air intake
system?
Does the Subaru Select Moni-
tor or general scan tool display
only one DTC?
Are DTCs P0301 and P0302
displayed on the Subaru Select
Monitor or general scan tool?
EN(H4SO)(diag)-177
ENGINE (DIAGNOSTICS)
Yes No
Go to step 16. Go to step 14.
Go to step 15.
Finish diagnostics
operation, if the
engine has no
abnormality.
Repair the poor Contact your SOA
contact. Service Center
after checking fol-
lowings.
NOTE:
In this case, check
the following:
• Condition of fuel
• Fuel additive
used or not
• Visually check

spark plug

• Visually check
spark plug cord
• Condition of en-
gine oil
Repair the air Go to step 17.
intake system.
NOTE:
Check the follow-
ing items.
• Are there air
leaks or air suction
caused by loose or
dislocated nuts
and bolts?
• Are there cracks
or any disconnec-
tion of hoses?
Go to step 22. Go to step 18.
Go to step 23. Go to step 19.