Subaru Legacy 2002 Service Manual page 622

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK ANY OTHER DTC ON DISPLAY.
NOTE:
In this case, it is not necessary to inspect
DTC P0106.
2 CHECK AIR INTAKE SYSTEM.
3 CHECK PRESSURE SENSOR.
1) Start the engine and warm-up engine until
coolant temperature is greater than 60°C
(140°F).
2) Place the shift lever in the selector lever in
"N" or "P" position.
3) Turn A/C switch to OFF.
4) Turn all accessory switches to OFF.
5) Read data of intake manifold pressure sen-
sor signal using Subaru Select Monitor or
OBD-II general scan tool.
NOTE:
¼ Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE".
<Ref. to EN-34, Subaru Select Monitor.>
¼ OBD-II general scan tool
For detailed operation procedure, refer to the
OBD-II General Scan Tool Instruction Manual.
Specification:
¼ Intake manifold absolute pressure
Ignition ON
73.3 — 106.6 kPa (550 — 800 mmHg,
21.65 — 31.50 inHg)
Idling
20.0 — 46.7 kPa (150 — 350 mmHg,
5.91 — 13.78 inHg)
4 CHECK THROTTLE POSITION.
Read data of throttle position signal using
Subaru Select Monitor or OBD-II general scan
tool.
NOTE:
¼ Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE".
<Ref. to EN-34, Subaru Select Monitor.>
¼ OBD-II general scan tool
For detailed operation procedure, refer to the
OBD-II General Scan Tool Instruction Manual.
5 CHECK THROTTLE POSITION.
Step
Does the Subaru Select
Monitor or OBD-II general
scan tool indicate DTC
P0107, P0108 or P1112?
Are there holes, loose bolts
or disconnection of hose on
air intake system?
Is the value within the
specifications?
Is throttle positioning ratio
equal to or less than 5%
when throttle is fully
closed?
Is throttle positioning ratio
equal to or more than 85%
when throttle is fully open?
EN-105
Check Yes
Inspect DTC
P0107, P0108 or
P1112 using "17.
List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN-82, List of
Diagnostic
Trouble Code
(DTC).>
Repair air intake
system.
Go to step 4.
Go to step 5.
Replace intake air
temperature and
pressure sensor.
<Ref. to FU-37,
Intake Air Tem-
perature and
Pressure Sensor.>
Engine (Diagnostics)
No
Go to step 2.
Go to step 3.
Replace intake air
temperature sen-
sor and pressure
sensor. <Ref. to
FU-37, Intake Air
Temperature and
Pressure Sensor.>
Adjust or replace
throttle position
sensor. <Ref. to
FU-34, Throttle
Position Sensor.>
Replace throttle
position sensor.
<Ref. to FU-34,
Throttle Position
Sensor.>