Subaru Legacy 2004 Service Manual page 2462

Step
6 PERFORM THE DIAGNOSIS.
1) Inspect using the "Diagnostic Procedure
with Diagnostic Trouble Code (DTC)". <Ref. to
5AT(diag)-34, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
NOTE:
For DTC table, refer to "List of Diagnostic Trou-
ble Code (DTC)". <Ref. to 5AT(diag)-30, List of
Diagnostic Trouble Code (DTC).>
2) Repair the trouble cause.
3) Perform clear memory mode.
4) Perform the inspection mode. <Ref. to
5AT(diag)-20, Inspection Mode.>
5) Display DTC.
Basic Diagnostics Procedure
Is DTC displayed?
5AT(diag)-3
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check Yes
Inspect using the
"Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC)". <Ref. to
5AT(diag)-34,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>
No
Inspect using
"General Diagnos-
tic Table". <Ref. to
5AT(diag)-147,
General Diagnos-
tic Table.>