Basic Diagnostic Procedure - Subaru Legacy 2002 Service Manual

Engine (Diagnostics)

1. Basic Diagnostic Procedure

S038501
A: PROCEDURE
1. WITH SUBARU SELECT MONITOR
No.
1 CHECK ENGINE START FAILURE.
1) Ask the customer when and how the
trouble occurred using the interview check list.
<Ref. to EN(w/oOBD)-4, CHECK, Check List
for Interview.>
2) Start the engine.
2 CHECK ILLUMINATION OF CHECK ENGINE
MALFUNCTION INDICATOR LAMP (MIL).
<Ref. to EN(w/oOBD)-33, ACTIVATION OF
CHECK ENGINE MALFUNCTION INDICA-
TOR LAMP (MIL), Engine Malfunction Indica-
tor Lamp (MIL).>
3 CHECK INDICATION OF DTC ON DISPLAY.
1) Turn ignition switch to OFF.
2) Connect the Subaru Select Monitor to data
link connector.
3) Turn ignition switch to ON and the Subaru
Select Monitor switch to ON.
4) Read DTC on the Subaru Select Monitor.
<Ref. to EN(w/oOBD)-26, WITH SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code.>
4 PERFORM THE DIAGNOSIS.
1) Perform the clear memory mode. <Ref. to
EN(w/oOBD)-30, OPERATION, Clear Memory
Mode.>
2) Perform the inspection mode. <Ref. to
EN(w/oOBD)-28, OPERATION, Inspection
Mode.>
BASIC DIAGNOSTIC PROCEDURE
S038501E45
S038501E4501
Step
EN(w/oOBD)-2
Check
Does the engine start?
Does MIL illuminate?
Does the Subaru Select
Monitor indicate DTC?
<Ref. to EN(w/oOBD)-66,
LIST, List of Diagnostic
Trouble Code (DTC).>
Does the Subaru Select
Monitor indicate DTC?
<Ref. to EN(w/oOBD)-66,
LIST, List of Diagnostic
Trouble Code (DTC).>
Yes
Go to step 2. Inspection using
"Diagnostics for
Engine Starting
Failure". <Ref. to
EN(w/oOBD)-45,
Diagnostics for
Engine Starting
Failure.>
Go to step 3. Inspection using
"General Diagnos-
tic Table". <Ref. to
EN(w/oOBD)-112,
INSPECTION,
General Diagnos-
tic Table.>
Record diagnostic Repair the related
trouble code. parts.
Repair the trouble NOTE:
cause. <Ref. to If DTC is not
EN(w/oOBD)-68, shown on display
Diagnostic Proce- although the MIL
dure with Diag- illuminates, per-
nostic Trouble form diagnostics
Code (DTC).> Go of MIL (CHECK
to step 4. ENGINE malfunc-
tion indicator
lamp) circuit or
combination
meter. <Ref. to
EN(w/oOBD)-33,
Engine Malfunc-
tion Indicator
Lamp (MIL).>
Record diagnostic Complete the
trouble code. diagnosis.
Repair the trouble
cause. <Ref. to
EN(w/oOBD)-68,
Diagnostic Proce-
dure with Diag-
nostic Trouble
Code (DTC).> Go
to step 4.
No