Subaru FORESTER 2001 Service Manual page 234

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DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1
CHECK ANY OTHER DTC ON DISPLAY.
2
CHECK IDLE AIR CONTROL SOLENOID
VALVE.
1) Turn ignition switch to OFF.
2) Remove idle air control solenoid valve from
throttle body. <Ref. to FU(DOHC TURBO)-36,
REMOVAL, Idle Air Control Solenoid Valve.>
3) Using an air gun, force air into idle air con-
trol solenoid valve by-pass air inlet. Confirm
that forced air subsequently escapes from
both main air passage and assist air passage.
3
CHECK IDLE AIR CONTROL SOLENOID
VALVE DUTY RATIO.
1) Turn ignition switch to ON.
2) Start engine, and warm-up the engine.
3) Turn all accessory switches to OFF.
4) Read data of idle air control solenoid valve
duty ratio using Subaru Select Monitor or
OBD-II general scan tool.
NOTE:
¼ Subaru Select Monitor
For detailed operation procedures, refer to the
"READ CURRENT DATA FOR ENGINE".
<Ref. to EN(DOHC TURBO)-36, Subaru
Select Monitor.>
¼ OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
4
CHECK BY-PASS AIR LINE.
1) Turn ignition switch to OFF.
2) Remove idle air control solenoid valve from
throttle body. <Ref. to FU(DOHC TURBO)-36,
REMOVAL, Idle Air Control Solenoid Valve.>
3) Remove throttle body to intake manifold.
<Ref. to FU(DOHC TURBO)-14, REMOVAL,
Throttle Body.>
4) Using an air gun, force air into solenoid
valve installation area and throttle valve inte-
rior. Confirm that forced air subsequently
escapes from both these areas.
Step
Does the Subaru Select
Monitor or OBD-II general
scan tool indicate DTC
P0508 or P0509
Does air flow out?
Is the value more than
60%?
Does air flow out?
EN(DOHC TURBO)-233
Check
Yes
Inspect DTC
P0505 or P1505
using "List of
Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(DOHC
TURBO)-82, List
of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0506.
Go to step 4.
Go to step 4.
Replace idle air
control solenoid
valve. <Ref. to
FU(DOHC
TURBO)-36, Idle
Air Control Sole-
noid Valve.>
Engine (Diagnostics)
No
Go to step 2.
Replace idle air
control solenoid
valve. <Ref. to
FU(DOHC
TURBO)-36, Idle
Air Control Sole-
noid Valve.> After
replace, Go to
step 3.
END.
Replace throttle
body. <Ref. to
FU(DOHC
TURBO)-14,
Throttle Body.>

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