Basic Diagnostics Procedure - Subaru Forester 2004 Service Manual

ENGINE (DIAGNOSTIC)

1. Basic Diagnostics 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(H4DOTC 2.5)-3, INSPECTION,
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 the
OBD-II 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 Moni-
tor or OBD-II general scan tool.
4 PERFORM THE DIAGNOSIS.
1) Perform clear memory mode. <Ref. to
EN(H4DOTC 2.5)-42, Clear Memory Mode.>
2) Perform the "INSPECTION MODE". <Ref.
to EN(H4DOTC 2.5)-35, Inspection Mode.>
Basic Diagnostics Procedure
Does the engine start?
Does malfunction indicator
light illuminate?
Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC?
Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC?
EN(H4DOTC 2.5)-2
Check
Go to step 2.
Go to step 3.
Record the DTC.
Repair the trouble
cause. <Ref. to
EN(H4DOTC 2.5)-
65, List of Diag-
nostic Trouble
Code (DTC).> Go
to step 4.
Check on "Diag-
nostic Chart with
Diagnostic Trou-
ble Code (DTC)".
<Ref. to
EN(H4DOTC 2.5)-
70, Diagnostic
Procedure with
Diagnostic Trou-
ble Code (DTC).>
Yes No
Inspection using
"Diagnostics for
Engine Start Fail-
ure". <Ref. to
EN(H4DOTC 2.5)-
54, Diagnostics for
Engine Starting
Failure.>
Inspection using
"General Diagnos-
tic Table". <Ref. to
EN(H4DOTC 2.5)-
258, General Diag-
nostic Table.>
Repair the related
parts.
NOTE:
If DTC is not shown
on display although
the malfunction in-
dicator light illumi-
nates, perform the
diagnostics for mal-
function indicator
light circuit or com-
bination meter.
<Ref. to
EN(H4DOTC 2.5)-
45, Malfunction In-
dicator Light.>
Finish the diagno-
sis.