Subaru IMPREZA 2002 Service Manual page 613

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK ANY OTHER DTC ON DISPLAY.
!
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
i CHECK THROTTLE CABLE.
1
CHECK AIR BY-PASS LINE.
1)Turn the ignition switch to OFF.
2)Remove the idle air control solenoid valve
from throttle body. <Ref. to FU(S0HC)-36, Idle
Air Control Solenoid Valve.>
3)Confirm that there are no foreign particles in
by-pass air line.
Check
Does the Subaru Select Moni-
tor or OBD-ll general scan tool
indicate DTC P1510, P1511,
P1512, P1513, P1514, P1515,
P1516 or P1517?
IS
there a fault in air intake sys.
tem?
Does the throttle cable have
play for adjustment?
Are foreign particles in by-pass
air line?
Yes
Inspect DTC
P1510, P1511,
P1512, P1513,
P1514, P1515,
P1516 or P1517
using "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to
List of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0507.
Repair air suction
and leaks.
EN(S0HC)-77,
Go to step 4.
Remove foreign
Darticles from by-
)ass air line.
No
i o to step
2 .
20 to step
3.
4djust throttle
:able. <Ref. to
TION, Accelerator
;ontrol Cable.>
3eplace the idle
ir control solenoid
alve. <Ref. to
Ile Air Control
;olenoid Valve.>
SP-7, INSTALLA-
'U (S0HC)-36,
EN(S0HC)-289