Basic Diagnostic Procedure - Subaru Legacy 2002 Service Manual

Automatic Transmission (Diagnostics)

1. Basic Diagnostic Procedure

A: PROCEDURE
No.
1 CHECK PRE-INSPECTION.
1) Ask the customer when and how the
trouble occurred using interview checklist.
<Ref. to AT-4, Check List for Interview.>
2) Before performing diagnosis, inspect the
following items which might influence the AT
problems.
¼ General inspection <Ref. to AT-5,
INSPECTION, General Description.>
¼ Oil leak
¼ Stall speed test <Ref. to AT-13, Stall Test.>
¼ Line pressure test <Ref. to AT-16, Line
Pressure Test.>
¼ Transfer clutch pressure test <Ref. to
AT-18, Transfer Clutch Pressure Test.>
¼ Time lag test <Ref. to AT-15, Time Lag
Test.>
¼ Road test <Ref. to AT-12, Road Test.>
¼ Inhibitor switch <Ref. to AT-29, Inhibitor
Switch.>
2 CHECK POWER INDICATOR LIGHT.
Turn ignition switch to ON.
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-28, Diagnostic Procedure for
POWER Indicator Light.>
3) Turn ignition switch to ON.
4 CHECK INDICATION OF DTC.
Calling up the DTC.
Without SUBARU SELECT MONITOR
<Ref. to AT-21, WITHOUT SUBARU SELECT
MONITOR, OPERATION, Read Diagnostic
Trouble Code (DTC).>
With SUBARU SELECT MONITOR
<Ref. to AT-22, 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-36,
COMMUNICATION FOR INITIALIZING
IMPOSSIBLE, Diagnostic Procedure for
Select Monitor Communication.>
BASIC DIAGNOSTIC PROCEDURE
S004501E45
Step
S004501
Check
Is unit that might influence
the AT problem normal?
Does not the POWER indi-
cator light light up?
Is the POWER indicator
light flashing?
Is the DTC displayed?
AT-2
Yes
Go to step 2. Repair or replace
each item.
Go to step 3. Go to step 4.
Go to step 4. Go to step 5.
Go to step 6. Go to step 5.
NOTE:
Record all DTCs.
No