Subaru Legacy 2002 Service Manual page 1530

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK THROTTLE CABLE.
3 CHECK AIR INTAKE SYSTEM.
1) Turn ignition switch to ON.
2) Start engine, and idle it.
3) Check the following items.
¼ Loose installation of intake manifold, idle air
control solenoid valve and throttle body
¼ Cracks of intake manifold gasket, idle air
control solenoid valve gasket and throttle
body gasket
¼ Disconnections of vacuum hoses
Step
Is there any other DTC on
display?
Does throttle cable have
play for adjustment?
Is there a fault in air intake
system?
EN(H6)-323
Check Yes
Inspect the rel-
evant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H6)-87, List of
Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P1507.
Go to step 2.
Repair air suction
and leaks.
Engine (DIAGNOSTICS)
No
Go to step 2.
Adjust throttle
cable. <Ref. to
SP(H6)-9, Accel-
erator Control
Cable.>
Replace idle air
control solenoid
valve. <Ref. to
FU(H6)-36, Idle
Air Control Sole-
noid Valve.>