Subaru Legacy III (2000-2003 year). Service manual — part 300

EN(H6DO)-2

ENGINE (DIAGNOSTICS)

BASIC DIAGNOSTIC PROCEDURE

1. Basic Diagnostic Procedure

A: PROCEDURE

1. ENGINE

Step

Value

Yes

No

1

CHECK ENGINE START FAILURE.
1) Ask the customer when and how the trou-

ble occurred using the interview check list.
<Ref. to EN(H6DO)-4, CHECK, Check List
for Interview.>

2) Start the engine.

Does the engine start?

Engine starts.

Go to step 2.

Inspection using
“Diagnostics for
Engine Start Fail-
ure”. <Ref. to
EN(H6DO)-71,
Diagnostics for
Engine Starting
Failure.>

2

CHECK ILLUMINATION OF CHECK ENGINE
MALFUNCTION INDICATOR LAMP (MI).
Does CHECK ENGINE malfunction indicator
lamp illuminate?

Indicator lamp illuminates.

Go to step 3.

Inspection using
“General Diagnos-
tics Table”. <Ref.
to EN(H6DO)-332,
INSPECTION,
General Diagnos-
tic Table.>

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 con-
nector.

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.
Does the Subaru Select Monitor or OBD-II
general scan tool indicate DTC?

DTC indicated.

Go to step 4.

Repair the related
parts.

NOTE:
If DTC is not
shown on display
although the MI il-
luminates, per-
form diagnostics of
MI (CHECK EN-
GINE malfunction
indicator lamp) cir-
cuit or combination
meter. <Ref. to
EN(H6DO)-58, En-
gine Malfunction
Indicator Lamp
(MI).>

4

PERFORM THE DIAGNOSIS.
1) Inspect using “Diagnostics Procedure with

Diagnostic Trouble Code (DTC)”.

NOTE:

<Ref. to EN(H6DO)-96, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

NOTE:

Carry out the basic check, only when DTC
about automatic transmission is shown on dis-
play. <Ref. to EN(H6DO)-46, Read Diagnostic
Trouble Code.>

2) Repair the trouble cause.
3) Perform the clear memory mode. <Ref. to

EN(H6DO)-54, Clear Memory Mode.>

4) Perform the inspection mode. <Ref. to

EN(H6DO)-47, Inspection Mode.>
Does the Subaru Select Monitor or OBD-II
general scan tool indicate DTC?

DTC indicated.

Inspect using
“Diagnostics Pro-
cedure with Diag-
nostic Trouble
Code (DTC)”.

NOTE:
<Ref. to
EN(H6DO)-96, Di-
agnostic Proce-
dure with
Diagnostic Trou-
ble Code (DTC).>

Complete the
diagnosis.

EN(H6DO)-3

ENGINE (DIAGNOSTICS)

BASIC DIAGNOSTIC PROCEDURE

2. AUTOMATIC TRANSMISSION

When trouble code about automatic transmission is
shown on display, carry out the following basic
check. After that, carry out the replacement or re-
pair work.
1) ATF level check <Ref. to AT-30, Automatic
Transmission Fluid.>
2) Differential gear oil level check <Ref. to AT-31,
Differential Gear Oil.>
3) ATF leak check <Ref. to AT-30, Automatic
Transmission Fluid.>
4) Differential gear oil leak check <Ref. to AT-31,
Differential Gear Oil.>
5) Stall test <Ref. to AT-33, Stall Test.>
6) Line pressure test <Ref. to AT-36, Line Pressure
Test.>
7) Transfer clutch pressure test <Ref. to AT-38,
Transfer Clutch Pressure Test.>
8) Time lag test <Ref. to AT-35, Time Lag Test.>
9) Road test <Ref. to AT-32, Road Test.>
10) Shift characteristics <Ref. to AT-38, Transfer
Clutch Pressure Test.>

EN(H6DO)-4

ENGINE (DIAGNOSTICS)

CHECK LIST FOR INTERVIEW

2. Check List for Interview

A: CHECK

1. CHECK LIST NO. 1

Check the following items when problem has occurred.

NOTE:
Use copies of this page for interviewing customers.

Customer's name

Engine no.

Date of sale

Fuel brand

Date of repair

Odometer reading

km

Vin no.

miles

Weather

❏

Fine

❏

Cloudy

❏

Rainy

❏

Snowy

❏

Various/Others:

Outdoor temperature

°

F (

°

C)

❏

Hot

❏

Warm

❏

Cool

❏

Cold

Place

❏

Highway

❏

Suburbs

❏

Inner city

❏

Uphill

❏

Downhill

❏

Rough road

❏

Others:

Engine temperature

❏

Cold

❏

Warming-up

❏

After warming-up

❏

Any temperature

❏

Others:

Engine speed

rpm

Vehicle speed

MPH

Driving conditions

❏

Not affected

❏

At starting

❏

While idling

❏

At racing

❏

While accelerating

❏

While cruising

❏

While decelerating

❏

While turning (RH/LH)

Headlight

❏

ON/

❏

OFF

Rear defogger

❏

ON/

❏

OFF

Blower

❏

ON/

❏

OFF

Radio

❏

ON/

❏

OFF

A/C compressor

❏

ON/

❏

OFF

CD/Cassette

❏

ON/

❏

OFF

Cooling fan

❏

ON/

❏

OFF

Car phone

❏

ON/

❏

OFF

Front wiper

❏

ON/

❏

OFF

CB

❏

ON/

❏

OFF

Rear wiper

❏

ON/

❏

OFF

EN(H6DO)-5

ENGINE (DIAGNOSTICS)

CHECK LIST FOR INTERVIEW

2. CHECK LIST NO. 2

Check the following items about the vehicle's state when MI turns on.

NOTE:
Use copies of this page for interviewing customers.

a) Other warning lights or indicators turn on.

❏

Yes/

❏

No

❏

Low fuel warning light

❏

Charge indicator light

❏

AT diagnostics indicator light

❏

ABS warning light

❏

VDC warning light

❏

Engine oil pressure warning light

b) Fuel level

• Lack of gasoline:

❏

Yes/

❏

No

• Indicator position of fuel gauge:

c) Intentional connecting or disconnecting of harness connectors or spark plug cords:

❏

Yes/

❏

No

• What:

d) Intentional connecting or disconnecting of hoses:

❏

Yes/

❏

No

• What:

e) Installing of parts other than genuine parts:

❏

Yes/

❏

No

• What:
• Where:

f) Occurrence of noise:

❏

Yes/

❏

No

• From where:
• What kind:

g) Occurrence of smell:

❏

Yes/

❏

No

• From where:
• What kind:

h) Intrusion of water into engine compartment or passenger compartment:

❏

Yes/

❏

No

i) Troubles occurred

❏

Engine does not start.

❏

Engine stalls during idling.

❏

Engine stalls while driving.

❏

Engine speed decreases.

❏

Engine speed does not decrease.

❏

Rough idling

❏

Poor acceleration

❏

Back fire

❏

After fire

❏

No shift

❏

Excessive shift shock