Subaru LEGACY 2006 Manual page 266

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK AIR CLEANER ELEMENT.
1) Turn the ignition switch to OFF.
2) Check the air cleaner element.
3 CHECK ELECTRONIC THROTTLE CON-
TROL.
1) Turn the ignition switch to OFF.
2) Remove the electronic throttle control.
3) Check the electronic throttle control.
Check
Is any other DTC displayed?
Is the air cleaner element
excessively clogged?
Are foreign matter found inside
electronic throttle control?
EN(H4SO)(diag)-229
ENGINE (DIAGNOSTICS)
Yes No
Check the appro- Go to step 2.
priate DTC using
the "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to
EN(H4SO)(diag)-
70, List of Diag-
nostic Trouble
Code (DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0506.
Replace the air Go to step 3.
cleaner element.
<Ref. to
IN(H4SO)-4, Air
Cleaner Element.>
Remove foreign Perform the diag-
matter from elec- nosis of DTC
tronic throttle con- P2101.
trol.