Basic Diagnostic Procedure - Subaru Legacy 2005 Service Manual

ENGINE (DIAGNOSTICS)

1. Basic Diagnostic Procedure

A: PROCEDURE
1. ENGINE
Step
1 CHECK ENGINE START FAILURE.
1) Ask the customer when and how the trou-
ble occurred using the interview check list.
<Ref. to EN(H4SO 2.0)(diag)-3, CHECK,
Check List for Interview.>
2) Start the engine.
2 CHECK ILLUMINATION OF MALFUNCTION
INDICATOR LIGHT.
3 CHECK INDICATION OF DTC ON DISPLAY.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor or gen-
eral scan tool to data link connector.
3) Turn the ignition switch to ON.
4) Read DTC using Subaru Select Monitor or
general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
"Read Diagnostic Trouble Code (DTC)". <Ref.
to EN(H4SO 2.0)(diag)-31, Read Diagnostic
Trouble Code (DTC).>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
4 PERFORM DIAGNOSIS.
1) Perform the clear memory mode. <Ref. to
EN(H4SO 2.0)(diag)-38, Clear Memory
Mode.>
2) Perform the inspection mode. <Ref. to
EN(H4SO 2.0)(diag)-32, Inspection Mode.>
Basic Diagnostic Procedure
Does the engine start?
Does the malfunction indicator
light illuminate?
Is DTC displayed on the Sub-
aru Select Monitor or general
scan tool?
Is DTC displayed on the Sub-
aru Select Monitor or general
scan tool?
EN(H4SO 2.0)(diag)-2
Check
Go to step 2.
Go to step 3.
Record the DTC.
Repair the trouble
cause. <Ref. to
EN(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>
Go to step 4.
Inspect using
"Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC)".
<Ref. to EN(H4SO
2.0)(diag)-69,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>
Yes No
Inspection using
"Diagnostics for
Engine Starting
Failure" <Ref. to
EN(H4SO
2.0)(diag)-50,
Diagnostics for
Engine Starting
Failure.>
Inspection using
"General Diagnos-
tic Table". <Ref. to
EN(H4SO
2.0)(diag)-224,
INSPECTION,
General Diagnos-
tic Table.>
Repair the related
parts.
NOTE:
If DTC is
shown on display
although the mal-
function indicator
light illuminates,
perform the diag-
nostics of malfunc-
tion indicator light
circuit or combina-
tion meter. <Ref. to
EN(H4SO 2.0)(di-
ag)-41, Malfunc-
tion Indicator
Light.>
Finish the diagno-
sis.
not