Subaru Legacy III (2000-2003 year). Service 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.
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.
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.
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.
NOTE:
Record all DTCs.
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
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-
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
(
)
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