Subaru IMPREZA 2002 Service Manual page 567

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Check
Ioes the Subaru Select Moni-
or or OBD-II general scan tool
idicate DTC P1510, P1511,
V512, P1513, P1514, P1515,
'1 51 6 or P I 51 7?
s
there a fault in air intake sys-
em?
Ioes the throttle cable have
)lay for adjustment?
ire foreign particles in by-pass
iir line?
Step
CHECK ANY OTHER DTC ON DISPLAY.
Yes
Inspect DTC
P I 510, P I 51 1,
P1512, P1513,
P1514, P1515,
PI516 or PI517
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
particles from by-
pass air line.
!
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
1 CHECK THROTTLE CABLE.
I 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,
REMOVAL, Idle Air Control Solenoid Valve.>
3)Confirm that there are no foreign particles in
by-pass air line.
No
20 to step 2.
;o
to step 3.
idjust throttle
:able. <Ref. to
TION, Accelerator
Zontrol Cable.>
3eplace the idle
iir control solenoid
ralve. <Ref. to
NSTALLATION,
dle Air Control
Solenoid Valve.>
SP-7, INSTALLA-
W(SOHC)-36,
EN(S0HC)-243