Basic Diagnostic Procedure - Subaru 2002 IMPREZA Service Manual

ENGINE (DIAGNOSTICS)

1. Basic Diagnostic Procedure

A: PROCEDURE
1. WITH SUBARU SELECT MONITOR
Step
1 CHECK ENGINE START FAILURE.
1)Ask the customer when and how 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)-32, ACTIVATION OF
CHECK ENGINE MALFUNCTION INDICA-
TOR LAMP (MIL), Engine Malfunction Indica-
tor Lamp (MIL).>
3 CHECK INDICATION OF DIAGNOSTIC
TROUBLE CODE (DTC) ON DISPLAY.
1)Turn the ignition switch to OFF.
2)Connect the Subaru Select Monitor to data
link connector.
3)Turn the ignition switch to ON and the Sub-
aru Select Monitor switch to ON.
4)Read any DTC on Subaru Select Monitor.
<Ref. to EN(w/oOBD)-26, WITH SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
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
Does the engine start?
Does the MIL illuminate?
Does the Subaru Select Moni-
tor indicate DTC? <Ref. to
EN(w/oOBD)-63, LIST, List of
Diagnostic Trouble Code
(DTC).>
Does the Subaru Select Moni-
tor indicate DTC? <Ref. to
EN(w/oOBD)-63, LIST, List of
Diagnostic Trouble Code
(DTC).>
EN(w/oOBD)-2
Check
Go to step 2.
Go to step 3.
Record the DTC.
Repair the trouble
cause. <Ref. to
EN(w/oOBD)-66,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).> Go to
step 4.
Record the DTC.
Repair the trouble
cause. <Ref. to
EN(w/oOBD)-66,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).> Go to
step 4.
Yes No
Inspection using
"Diagnostics for
Engine Starting
Failure". <Ref. to
EN(w/oOBD)-42,
Diagnostics for
Engine Starting
Failure.>
Inspection using
"General Diagnos-
tic Table". <Ref. to
EN(w/oOBD)-110,
INSPECTION,
General Diagnos-
tic Table.>
Repair the related
parts.
NOTE:
If a DTC is not
shown on display
although MIL illu-
minates, perform
diagnostics of MIL
(CHECK ENGINE
malfunction indica-
tor lamp) circuit or
combination
meter. <Ref.
EN(w/oOBD)-32,
Engine Malfunc-
tion Indicator Lamp
(MIL).>
Complete the
diagnosis.
to