Subaru 2002 IMPREZA Service Manual page 1464

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
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 the A/C switch to OFF.
4)Turn all accessory switches to OFF.
5)Read the data of intake manifold pressure
sensor signal using Subaru Select Monitor or
OBD-II general scan tool.
NOTE:
•Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE".
<Ref. to EN(TURBO)-34, Subaru Select Moni-
tor.>
•OBD-II general scan tool
For detailed operation procedure, refer to the
OBD-II General Scan Tool Instruction Manual.
Specification:
•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 the data of throttle position signal using
Subaru Select Monitor or OBD-II general scan
tool.
NOTE:
•Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE".
<Ref. to EN(TURBO)-34, Subaru Select Moni-
tor.>
•OBD-II general scan tool
For detailed operation procedure, refer to the
OBD-II General Scan Tool Instruction Manual.
5 CHECK THROTTLE POSITION.
Check
Is the value within the specifi-
cations?
Is the throttle positioning ratio
equal to or less than 5% when
throttle is fully closed?
Is the throttle positioning ratio
equal to or more than 85%
when throttle is fully open?
EN(TURBO)-304
Yes
Go to step 4. Replace the intake
air temperature
sensor and pres-
sure sensor. <Ref.
to FU(TURBO)-35,
Pressure Sensor.>
Go to step 5. Adjust or replace
the throttle posi-
tion sensor. <Ref.
to FU(TURBO)-33,
Throttle Position
Sensor.>
Replace the intake Replace the throt-
air temperature tle position sensor.
and pressure sen- <Ref. to
sor. <Ref. to FU(TURBO)-33,
FU(TURBO)-35, Throttle Position
Pressure Sensor.> Sensor.>
No