Basic Diagnostic Procedure - Subaru IMPREZA 2002 Service Manual

BASIC DIAGNOSTIC PROCEDURE
ENGINE (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
1. ENGINE
Step
I CHECK ENGINE START FAILURE.
1)Ask the customer when and how the trouble
occurred using the interview check list. <Ref. to
EN(S0HC)-4, CHECK, Check List for Inter-
view.>
2)Start the engine.
!
CHECK ILLUMINATION OF CHECK ENGINE
MALFUNCTION INDICATOR LAMP (MIL).
CHECK INDICATION OF DTC ON DISPLAY.
1)Turn the ignition switch to OFF.
2)Connect the Subaru Select Monitor or the
OBD-ll general scan tool to data link connec-
tor.
3)Turn the ignition switch to ON and the Sub-
aru Select Monitor or OBD-II general scan tool
switch to ON.
4)Read the DTC on the Subaru Select Monitor
or OBD-ll general scan tool.
I PERFORM THE DIAGNOSIS.
1)Perform the clear memory mode. <Ref. to
EN(S0HC)-43, Clear Memory Mode.>
2)Perform the inspection mode. <Ref.
to
EN(S0HC)-40, Inspection Mode.>
Check
loes the engine start?
loes CHECK ENGINE mal-
unction indicator lamp illumi-
late?
Ioes the Subaru Select Moni-
or or OBD-II general scan tool
ndicate DTC?
Ioes the Subaru Select Moni-
or or OBD-ll general scan tool
ndicate DTC?
Yes
30 to step 2.
30 to step
3 .
Record the diag-
iostic trouble
:ode. Repair the
trouble cause.
<Ref. to
List of Diagnostic
Trouble Code
(DTC).> Go to
step 4.
EN(S0HC)-77,
Inspect using
'Diagnostics Pro-
cedure with Diag-
nostic Trouble
Code (DTC)".
<Ref. to
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>
EN(S0HC)-84,
No
Inspection using
"Diagnostics for
Engine Start Fail-
ure". <Ref. to
Diagnostics for
Engine Starting
Failure.>
Inspection using
"General Diagnos-
tics Table". <Ref.
INSPECTION,
General Diagnos-
tic Table.>
Repair the related
parts.
NOTE:
If DTC is no
shown on displa)
although the MIL il.
luminates, per,
form diagnostics o
GlNE malfunctior
indicator lamp) cir.
cuit or combinatior
meter. <Ref. tc
Engine Malfunc,
tion Indicator Lamr
(MIL).>
Complete the
diagnosis.
EN(S0HC)-57,
to EN(S0HC)-330,
MIL (CHECK EN,
EN(S0HC)-46,
EN(S0HC)-2