Diagnostic Procedure With Diagnostic Trouble Code (Dtc) - Subaru IMPREZA 2002 Service Manual

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
4 -
ReDlace the intake Replace the throt-
No
30 to step 2.
Go to step 3 .
Replace the intake
air temperature
sensor and pres-
sure sensor. <Ref.
Intake Air Temper-
ature and Pres-
sure Sensor.>
to FU(S0HC)-34,
EN(SOHC)-103
Step Check
CHECK ANY OTHER DTC ON DISPLAY. Does the Subaru Select Moni-
tor or OBD-II general scan tool
NOTE:
In this case, it is not necessary to inspect DTC indicate DTC P0107, PO108 or
PO1 06. P I 112?
CHECK AIR INTAKE SYSTEM.
Are there holes, loose bolts or
disconnection of hose on air
Yes
Inspect DTC
PO107, PO108 or
P1112 Using "List
of Diagnostic Trou-
ble Code (DTC)".
<Ref. to
List of Diagnostic
Trouble Code
(DTC).>
Repair air intake
system.
EN(S0HC)-77,
intake system?
CHECK PRESSURE SENSOR.
I s
the value within the specifi- ]Go to step 4.
1)Start the engine and warm-up engine until
coolant temperature is greater than 60°C
(1 40°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-ll general scan tool.
NOTE:
*Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE. <Ref.
to EN(S0HC)-32, Subaru Select Monitor.>
*OBD-II general scan tool
For detailed operation procedure, refer to the
OBD-ll 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)
20.0
-
46.7 kPa (150
-
350 mmHg, 5.91
-
13.78 inHg)
Idling
CHECK THROITLE POSITION.
Ications?
Is the throttle positioning ratio
30 to step 5.
Adjust or replace
the throttle posi-
tion sensor. <Ref.
Throttle Position
Sensor.>
to FU(SOHC)-31,
Read the data of throttle position signal using
Subaru Select Monitor or OBD-ll general scan
tool.
NOTE:
*Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(S0HC)-32, Subaru Select Monitor.>
*OBD-ll general scan tool
For detailed operation procedure, refer to the
OBD-ll General Scan Tool Instruction Manual.
¶
CHECK THROTTLE POSITION.
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?
air temperature
and pressure sen-
FU(S0HC)-34,
Intake Air Temper-
ature and Pres-
sure Sensor.>
sor. <Ref. to
tle position sen-
sor. <Ref. to
Throttle Position
Sensor.>
FU(S0HC)-31,