Subaru 2002 IMPREZA Service Manual page 475

51
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
_ _
Step
I 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
loes the Subaru Select Moni-
or or OBD-ll general scan tool
ndicate DTC PO508 or P0509?
loes the throttle cable have
,lay for adjustment?
s there a fault in air intake sys-
em?
Yes
Inspect DTC
PO508 or PO509
Jsing "List of Diag-
iostic Trouble
:ode (DTC)".
<Ref. to EN(D0HC
TURBO)-80, List
Df
Diagnostic Trou-
de Code (DTC).>
NOTE:
In this case, it is
l o t necessary tc
inspect DTC
P0507.
Go to step 3 .
Repair air suction
and leaks.
No
20 to step 2.
4djust throttle
:able. <Ref. to
TION, Accelerator
2ontrol Cable.>
3eplace the idle
iir control solenoid
ialve. <Ref. to
-U(DOHC
rURBO)-36, Idle
4ir Control Sole-
ioid Valve.>
SP-7, INSTALLA-
EN( DOHC TU RB0)-251