Subaru Legacy 2002 Service Manual page 1324

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK IDLE SWITCH SIGNAL.
1) Turn ignition switch to ON.
2) Operate the LED operation mode for
engine using Subaru Select Monitor.
NOTE:
¼ Subaru Select Monitor
For detailed operation procedure, refer to the
"LED OPERATION MODE FOR ENGINE".
<Ref. to EN(H6)-38, Subaru Select Monitor.>
2 CHECK ANY OTHER DTC ON DISPLAY.
3 CHECK CONDITION OF INTAKE MANIFOLD
PRESSURE SENSOR.
4 CHECK CONDITION OF THROTTLE BODY.
5 CHECK CONDITION OF EGR VALVE.
Step
Does the LED of {Idle
Switch Signal} come on?
Does the Subaru Select
Monitor or OBD-II general
scan tool indicate DTC
P0107, P0108 or P1112?
Is the intake manifold pres-
sure sensor installation bolt
tightened securely?
Is the throttle body installa-
tion bolt tightened
securely?
Is there any foreign object
caught between EGR sole-
noid valve and intake mani-
fold?
EN(H6)-117
Check Yes
Go to step 2.
Inspect DTC
P0107, P0108 or
P1112 using "List
of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H6)-87, List of
Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0106.
Go to step 4.
Go to step 5.
Completely
remove foreign
object, and install
EGR solenoid
valve securely to
the intake mani-
fold.
Engine (DIAGNOSTICS)
No
Check throttle
position sensor
circuit. <Ref. to
EN(H6)-140, DTC
P0121 —
THROTTLE
POSITION SEN-
SOR CIRCUIT
RANGE/
PERFORMANCE
PROBLEM (HIGH
INPUT) —, Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0106.
Go to step 3.
Tighten intake
manifold pressure
sensor installation
bolt securely.
Tighten throttle
body installation
bolt securely.
Replace intake
manifold pressure
sensor. <Ref. to
FU(H6)-34, Intake
Manifold Pressure
Sensor.>