Subaru Legacy (2005 year). Service manual — part 541
AUTOMATIC TRANSMISSION
(DIAGNOSTICS)
4AT(diag)
Page
Basic Diagnostic Procedure . . . . . . . . . . . . . . . . . . 2
Check List for Interview. . . . . . . . . . . . . . . . . . . ...4
General Description . . . . . . . . . . . . . . . . . . . . . 5
Electrical Component Location . . . . . . . . . . . . . . . . ...7
Transmission Control Module (TCM) I/O Signal . . . . . . . . . ...13
Subaru Select Monitor. . . . . . . . . . . . . . . . . . . ...16
Read Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . ..19
Inspection Mode. . . . . . . . . . . . . . . . . . . . . . 20
Clear Memory Mode. . . . . . . . . . . . . . . . . . . . ..21
SPORT Indicator Light Display . . . . . . . . . . . . . . . . .22
Diagnostic Procedure for Subaru Select Monitor Communication . . . 26
List of Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . .31
Diagnostic Procedure with Diagnostic Trouble Code (DTC) . . . . . .33
Diagnostic Procedure without Diagnostic Trouble Code (DTC) . . . ..119
Diagnostics with Phenomenon. . . . . . . . . . . . . . . . 134
4AT(diag)-2
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Basic Diagnostic Procedure
1. Basic Diagnostic Procedure
A: PROCEDURE
Step
Check
Yes
No
1
CHECK PRE-INSPECTION.
1) Ask the customer when and how the trou-
ble occurred using the interview checklist.
<Ref. to 4AT(diag)-4, Check List for Interview.>
2) Before performing diagnosis, inspect the
following items which might influence the AT
problems.
• General inspection <Ref. to 4AT(diag)-5,
INSPECTION, General Description.>
• Disconnection of harness connector
• Visual check for harness damage
• Oil leakage
• Stall speed test <Ref. to 4AT-35, Stall Test.>
• Line pressure test <Ref. to 4AT-37, Line
Pressure Test.>
• Transfer clutch pressure test <Ref. to 4AT-
38, Transfer Clutch Pressure Test.>
• Time lag test <Ref. to 4AT-36, Time Lag
Test.>
• Road test <Ref. to 4AT-34, Road Test.>
• Inhibitor switch <Ref. to 4AT-51, Inhibitor
Switch.>
Is the unit that might influence
the AT problem normal?
Repair or replace
each item.
2
CHECK SPORT INDICATOR LIGHT.
After starting the engine, wait for at least 2 sec-
onds.
Does the SPORT indicator
light blink?
3
CHECK SPORT INDICATOR LIGHT.
1) Turn the ignition switch to OFF.
2) Check the SPORT indicator light.
<Ref. to 4AT(diag)-23, INSPECTION, SPORT
Indicator Light Display.>
3) After the ignition switch is turned to “ON”,
wait for at least 2 seconds.
4) Start the engine.
Does the SPORT indicator
light blink?
4
CHECK INDICATION OF DTC.
Display DTC.
NOTE:
If the communication function of Subaru Select
Monitor cannot be executed normally, check
communication circuit. <Ref. to 4AT(diag)-26,
COMMUNICATION FOR INITIALIZING IM-
POSSIBLE, Diagnostic Procedure for Subaru
Select Monitor Communication.>
Is DTC displayed on the Sub-
aru Select Monitor?
NOTE:
Record all DTC.
5
PERFORM GENERAL DIAGNOSTICS.
1) Inspect using “Diagnostic Procedure with-
out Diagnostic Trouble Code (DTC)”. <Ref. to
4AT(diag)-119, Diagnostic Procedure without
Diagnostic Trouble Code (DTC).>
2) Inspect using “Diagnostics with Phenome-
non”. <Ref. to 4AT(diag)-134, Diagnostics with
Phenomenon.>
3) Perform the inspection mode. <Ref. to
4AT(diag)-20, Inspection Mode.>
4) Display DTC.
Is DTC displayed on the Sub-
aru Select Monitor?
Finish the diagno-
sis.
4AT(diag)-3
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Basic Diagnostic Procedure
6
PERFORM DIAGNOSIS.
1) Inspect using the “Diagnostic Procedure
with Diagnostic Trouble Code (DTC)”. <Ref. to
4AT(diag)-33, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
NOTE:
For DTC table, refer to “List of Diagnostic Trou-
ble Code (DTC)”. <Ref. to 4AT(diag)-31, List of
Diagnostic Trouble Code (DTC).>
2) Repair the trouble cause.
3) Perform the clear memory mode.
4) Perform the inspection mode. <Ref. to
4AT(diag)-20, Inspection Mode.>
5) Display DTC.
Is DTC displayed on the Sub-
aru Select Monitor?
Inspect using the
“Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC)”. <Ref. to
4AT(diag)-33,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>
Finish the diagno-
sis.
Step
Check
Yes
No
4AT(diag)-4
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
Date of sale
Date of repair
Trans. model
Transmission
V.I.N.
Odometer reading
km (miles)
Frequency
❏ Continuous ❏ Intermittent (
times a day)
Weather
❏ Fine ❏ Cloudy ❏ Rainy ❏ Snowy
❏ Others
(
)
Place
❏ Highland ❏ Suburbs ❏ Inner city ❏ Uphill ❏ Rough road
❏ Others
(
)
Ambient air temperature
❏ Hot ❏ Warm ❏ Cool ❏ Cold
Vehicle speed
km/h (MPH)
AT warning light (SPORT indicator
light)
❏ Blinks continuously
❏ Not blink
Select lever position
❏ P ❏ R ❏ N ❏ D ❏ SPORT mode
Driving condition
❏ Not affected
❏ At racing
❏ When decelerating
❏ At starting
❏ When accelerating
❏ While turning (❏ RH/❏
LH)
❏ While idling
❏ While cruising
SPORT mode
❏ ON ❏ OFF
Symptom
❏ 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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