Basic Diagnostic Procedure - Subaru Legacy 2001 Service Manual

Engine (DIAGNOSTICS)

1. Basic Diagnostic Procedure

S048501
A: PROCEDURE
1. ENGINE
S048501E4501
No.
1 CHECK ENGINE START FAILURE.
1) Ask the customer when and how the
trouble occurred using the interview check list.
<Ref. to EN(H6)-4 CHECK, Check List for
Interview.>
2) Start the engine.
2 CHECK ILLUMINATION OF CHECK ENGINE
MALFUNCTION INDICATOR LAMP (MIL).
3 CHECK INDICATION OF DTC ON DISPLAY.
1) Turn ignition switch to OFF.
2) Connect the Subaru Select Monitor or the
OBD-II general scan tool to data link connec-
tor.
3) Turn ignition switch to ON and the Subaru
Select Monitor or OBD-II general scan tool
switch to ON.
4) Read DTC on the Subaru Select Monitor or
OBD-II general scan tool.
4 PERFORM THE DIAGNOSIS.
1) Inspect using "Diagnostics Procedure with
Diagnostic Trouble Code (DTC)".
NOTE:
<Ref. to EN(H6)-97 Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
NOTE:
Carry out the basic check, only when DTC
about automatic transmission is shown on
display. <Ref. to EN(H6)-48 Read Diagnostic
Trouble Code.>
2) Repair the trouble cause.
3) Perform the clear memory mode. <Ref. to
EN(H6)-52 Clear Memory Mode.>
4) Perform the inspection mode. <Ref. to
EN(H6)-49 Inspection Mode.>
BASIC DIAGNOSTIC PROCEDURE
S048501E45
Step
EN(H6)-2
Check
Does the engine start?
Does CHECK ENGINE
malfunction indicator lamp
illuminate?
Does the Subaru Select
Monitor or OBD-II general
scan tool indicate DTC?
Does the Subaru Select
Monitor or OBD-II general
scan tool indicate DTC?
Yes
Go to step 2. Inspection using
"Diagnostics for
Engine Start Fail-
ure". <Ref. to
EN(H6)-70 Diag-
nostics for Engine
Starting Failure.>
Go to step 3. Inspection using
"General Diagnos-
tics Table". <Ref.
to EN(H6)-321
INSPECTION,
General Diagnos-
tic Table.>
Go to step 4. Repair the related
parts.
NOTE:
If DTC is not
shown on display
although the MIL
illuminates, per-
form diagnostics
of MIL (CHECK
ENGINE malfunc-
tion indicator
lamp) circuit or
combination
meter. <Ref. to
EN(H6)-55 Engine
Malfunction Indi-
cator Lamp
(MIL).>
Inspect using Complete the
"Diagnostics Pro- diagnosis.
cedure with Diag-
nostic Trouble
Code (DTC)".
NOTE:
<Ref. to
EN(H6)-97 Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
No