Subaru 2002 IMPREZA Service Manual page 914

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
7 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(w/oOBD)-39,
Idle Air Control Solenoid Valve.>
3)Confirm that there are no foreign particles in
the by-pass air line.
8 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(w/oOBD)-39,
Idle Air Control Solenoid Valve.>
3)Remove the throttle body from intake mani-
fold. <Ref. to FU(w/oOBD)-16, Throttle Body.>
4)Confirm that there are no foreign particles in
the throttle body.
5)Using an air gun, force air into the idle air
control solenoid valve installation area. Con-
firm that forced air subsequently escapes from
the throttle body interior.
Check
Are foreign particles in the by-
pass air line?
Does air flow out?
EN(w/oOBD)-80
Yes
Remove the for- Replace the idle
eign particles from air control solenoid
by-pass air line. valve. <Ref. to
FU(w/oOBD)-39,
Idle Air Control
Solenoid Valve.>
Replace the idle Replace the throt-
air control solenoid tle body. <Ref. to
valve. <Ref. to FU(w/oOBD)-16,
FU(w/oOBD)-39, Throttle Body.>
Idle Air Control
Solenoid Valve.>
No