Subaru Impreza 2004 Service Manual page 128

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK THROTTLE CABLE.
3 CHECK AIR INTAKE SYSTEM.
1)Turn the ignition switch to ON.
2)Start the engine, and idle it.
3)Check the following items.
•Loose installation of intake manifold, idle air
control solenoid valve and throttle body
•Cracks of intake manifold gasket, idle air con-
trol solenoid valve gasket and throttle body
gasket
•Disconnections of vacuum hoses
Check
Is any other DTC displayed?
Does the throttle cable have
play for adjustment?
Is there a fault in air intake sys-
tem?
EN(H4DOTC)(diag)-207
ENGINE (DIAGNOSTICS)
Yes
Inspect the rele- Go to step 2.
vant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H4DOTC)(dia
g)-74, List of Diag-
nostic Trouble
Code (DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0507.
Go to step 3. Adjust the throttle
cable. <Ref. to
SP(H4SO)-9,
INSTALLATION,
Accelerator Con-
trol Cable.>
Repair the air suc- Replace the idle
tion and leaks. air control solenoid
valve. <Ref. to
FU(H4DOTC)-36,
Idle Air Control
Solenoid Valve.>
No