Subaru Legacy III (2000-2003 year). Manual — part 458

EN(H4DOSTC)-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(H4DOSTC)-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(H4DOSTC)-
66, Diagnostic
Procedure with
Diagnostic Trou-
ble Code (DTC).>

2

CHECK ILLUMINATION OF CHECK ENGINE
MALFUNCTION INDICATOR LAMP (MI).
Does the CHECK ENGINE malfunction indica-
tor lamp illuminate?

Indicator lamp illuminates.

Go to step 3.

Inspection using
“General Diagnos-
tics Table”. <Ref.
to EN(H4DOSTC)-
246, General
Diagnostic Table.>

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 con-
nector.

3) Turn the ignition switch to ON and the

Subaru Select Monitor or OBD-II general
scan tool switch to ON.

4) Read the DTC on the Subaru Select Moni-

tor.
Does the Subaru Select Monitor indicate
DTC?

DTC is indicated.

Record the DTC.
Repair the trouble
cause. <Ref. to
EN(H4DOSTC)-
62, List of Diag-
nostic Trouble
Code (DTC).> 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(H4DOSTC)-
38, Engine Mal-
function Indicator
Lamp (MI).>

4

PERFORM THE DIAGNOSIS.
1) Perform the clear memory mode. <Ref. to

EN(H4DOSTC)-35, Clear Memory Mode.>

2) Perform the inspection mode. <Ref. to

EN(H4DOSTC)-33, Inspection Mode.>
Does the Subaru Select Monitor indicate
DTC?

DTC is indicated.

Inspect using
“Diagnostics Pro-
cedure with Diag-
nostic Trouble
Code (DTC)”.
<Ref. to
EN(H4DOSTC)-
66, Diagnostic
Procedure with
Diagnostic Trou-
ble Code (DTC).>

Complete the
diagnosis.

EN(H4DOSTC)-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(H4DOSTC)-4

ENGINE (DIAGNOSTICS)

CHECK LIST FOR INTERVIEW

2. Check List for Interview

A: CHECK

1. CHECK LLIST 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

°

C (

°

F)

❏

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(H4DOSTC)-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

❏

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