Subaru Legacy III (2000-2003 year). Manual — part 567

AT-2

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

BASIC DIAGNOSTIC PROCEDURE

1. Basic Diagnostic Procedure

A: PROCEDURE

Step

Value

Yes

No

1

CHECK PRE-INSPECTION.
1) Ask the customer when and how the trou-

ble occurred using interview checklist.
<Ref. to AT-5, Check List for Interview.>

2) Before performing diagnosis, inspect the

following items which might influence the
AT problems.

•General inspection <Ref. to AT-6, INSPEC-
TION, General Description.>
•Oil leak
•Stall speed test <Ref. to AT-33, Stall Test.>
•Line pressure test <Ref. to AT-36, Line Pres-
sure Test.>
•Transfer clutch pressure test <Ref. to AT-38,
Transfer Clutch Pressure Test.>
•Time lag test <Ref. to AT-35, Time Lag Test.>
•Road test <Ref. to AT-32, Road Test.>
•Inhibitor switch <Ref. to AT-47, INSTALLA-
TION, Transmission Mounting System.>

Is unit that might influence the AT problem
normal?

Unit is normal.

Go to step 2.

Repair or replace
each item.

2

CHECK POWER INDICATOR LIGHT.
Turn ignition switch to ON.
Does not the POWER indicator light light up?

Indicator light flashes.

Go to step 4.

Go to step 3.

3

CHECK POWER INDICATOR LIGHT.
1) Turn ignition switch to OFF.
2) Repair POWER indicator light circuit or

power supply and ground line circuit.
<Ref. to AT-30, Diagnostic Procedure for
POWER Indicator Light.>

3) Turn ignition switch to ON.

Is the POWER indicator light flashing?

Indicator light flashes.

Go to step 4.

Go to step 5.

4

CHECK INDICATION OF DTC.
Calling up the DTC.
Without Subaru Select Monitor
<Ref. to AT-24, WITHOUT SUBARU SELECT
MONITOR, OPERATION, Read Diagnostic
Trouble Code (DTC).>
With Subaru Select Monitor
<Ref. to AT-25, WITH SUBARU SELECT
MONITOR, OPERATION, Read Diagnostic
Trouble Code (DTC).>

NOTE:

If the communication function of the select
monitor cannot be executed normally, check
the communication circuit. <Ref. to AT-38,
COMMUNICATION FOR INITIALIZING IM-
POSSIBLE, Diagnostic Procedure for Select
Monitor Communication.>

Is the DTC displayed?

DTC is displayed.

Go to step 6.

NOTE:
Record all DTCs.

Go to step 5.

AT-3

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

BASIC DIAGNOSTIC PROCEDURE

5

PERFORM THE GENERAL DIAGNOSTICS.
1) Inspect using “Diagnostic Procedure for

No-diagnostic Trouble Code (DTC)”. <Ref.
to AT-121, Diagnostic Procedure for No-
diagnostic Trouble Code (DTC).>

2) Inspect using “Symptom Related Diagnos-

tic”. <Ref. to AT-160, Symptom Related
Diagnostic.>

3) Perform the clear memory mode.

With Subaru Select Monitor
<Ref. to AT-27, WITH SUBARU SELECT
MONITOR, OPERATION, Clear Memory
Mode.>
Without Subaru Select Monitor
<Ref. to AT-27, WITHOUT SUBARU
SELECT MONITOR, OPERATION, Clear
Memory Mode.>

4) Perform the inspection mode. <Ref. to AT-

26, Inspection Mode.>
Calling up the diagnostic trouble code
(DTC).
Without Subaru Select Monitor
<Ref. to AT-24, WITHOUT SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
With Subaru Select Monitor
<Ref. to AT-25, WITH SUBARU SELECT
MONITOR, OPERATION, Read Diagnos-
tic Trouble Code (DTC).>
Is the DTC displayed?

DTC is displayed

Go to step 6.

Complete the
diagnosis.

Step

Value

Yes

No

AT-4

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

BASIC DIAGNOSTIC PROCEDURE

6

PERFORM THE DIAGNOSIS.
1) Inspect using “Diagnostics Chart with Diag-

nostic Trouble Code”. <Ref. to AT-42, Diag-
nostic Procedure with Diagnostic Trouble
Code (DTC).>

NOTE:

For trouble code table, refer to “List of Diagnos-
tic Trouble Code (DTC)”. <Ref. to AT-29, List of
Diagnostic Trouble Code (DTC).>

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

With Subaru Select Monitor
<Ref. to AT-27, WITH SUBARU SELECT
MONITOR, OPERATION, Clear Memory
Mode.>
Without Subaru Select Monitor
<Ref. to AT-27, WITHOUT SUBARU
SELECT MONITOR, OPERATION, Clear
Memory Mode.>

4) Perform the inspection mode. <Ref. to AT-

26, Inspection Mode.>

5) Calling up the diagnostic trouble code

(DTC).
Without Subaru Select Monitor
<Ref. to AT-24, WITHOUT SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
With Subaru Select Monitor
<Ref. to AT-25, WITH SUBARU SELECT
MONITOR, OPERATION, Read Diagnos-
tic Trouble Code (DTC).>
Is the DTC displayed?

DTC is displayed

Inspect using
“Diagnostics Chart
with Diagnostic
Connector”. <Ref.
to AT-42, Diagnos-
tic Procedure with
Diagnostic Trou-
ble Code (DTC).>

Complete the
diagnosis.

Step

Value

Yes

No

AT-5

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

CHECK LIST FOR INTERVIEW

2. Check List for Interview

A: CHECK

Check the following items when problem has occurred.

NOTE:
Use copies of this page for interviewing customers.

Customer's name

Data vehicle brought in

Data of repair

Trans. model

TRANSMISSION

VIN

Odometer reading

km/h or mile

Frequency

❏

Continuous

❏

Intermittent (

times a day)

Weather

❏

Fine

❏

Cloudy

❏

Rainy

❏

Snowy

❏

Various/Others

(

)

Place

❏

Highway

❏

Suburbs

❏

Inner city

❏

Uphill

❏

Rough road

❏

Others

(

)

Outdoor temperature

❏

Hot

❏

Warm

❏

Cool

❏

Cold

Vehicle speed

km/h (MPH)

Malfunction indicator lamp (MIL)

❏

Continuously lit

❏

Not lit

Select lever position

❏

P

❏

R

❏

N

❏

D

❏

3

❏

2

❏

1

Driving condition

❏

Not affected

❏

At racing

❏

While decelerating

❏

At starting

❏

While accelerating

❏

While turning (

❏

RH/

❏

LH)

❏

While idling

❏

While cruising

POWER switch

❏

ON

❏

OFF

HOLD switch

❏

ON

❏

OFF

Symptoms

❏

No up-shift

❏

No down-shift

❏

No kick down

❏

Vehicle does not move (

❏

Any position

❏

Particular position)

❏

Lock-up malfunction

❏

Noise or vibration

❏

Shift shock or slip

❏

Select lever does not move

❏

Others

(

)