Subaru IMPREZA 2002 Service Manual page 437

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
I
CHECK ANY OTHER DTC ON DISPLAY.
Check
Does the Subaru Select Moni-
tor or OBD-ll general scan tool
indicate DTC PO1 12, PO1 13,
PO1 17, PO1 18 or P0125?
!
CHECK ENGINE COOLANT TEMPERA-
TURE.
1)Start the engine and warm it up completely.
2)Measure the engine coolant temperature
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 procedures, refer to the
OBD-ll General Scan Tool Instruction Manual.
Is the engine coolant tempera-
ture between 75°C (1 67°F) and
95°C (203"F)?
Yes
Inspect
DTC
PO1 12, PO1 13,
P0117, P0118or
PO1 25 using "List
of Diagnostic Trou-
ble Code (DTC)".
<Ref. to
List of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it i :
not necessary tc
inspect DTC
P0111.
EN(S0HC)-77,
Replace the intake
air temperature
and pressure sen-
sor. <Ref. to
FU(S0HC)-34,
Intake Air Temper-
ature and Pres-
sure Sensor.>
No
30 to step 2.
Inspect DTC
PO125 using "List
of Diagnostic Trou.
ble Code (DTC)".
<Ref. to
EN(S0HC)-77,
List of Diagnostic
Trouble Code
(DTC).>
EN(S0HC)-113