Subaru 2002 IMPREZA Service Manual page 645

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODE (DTC) ON DISPLAY.
2 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-39, REMOVAL,
Idle Air Control Solenoid Valve.>
3)Remove the throttle body from intake mani-
fold. <Ref. to FU-16, REMOVAL, Throttle
Body.>
4)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
Is any other DTC displayed?
Does air flow out?
EN-213
ENGINE (DIAGNOSTICS)
Yes
Inspect the rele- Go to step 2.
vant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN-83, List of
Diagnostic Trou-
ble Code (DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0506.
Replace the idle Replace the throt-
air control solenoid tle body. <Ref. to
valve. <Ref. to FU- FU-16, INSTALLA-
39, INSTALLA- TION, Throttle
TION, Idle Air Body.>
Control Solenoid
Valve.>
No