Subaru 2002 IMPREZA Service Manual page 1588

AUTOMATIC TRANSMISSION (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
Step
1 CHECK PRE-INSPECTION.
1)Ask the customer when and how trouble
occurred using interview checklist. <Ref. to
AT-4, Check List for Interview.>
2)Before performing the diagnosis, inspect fol-
lowing items which might influence the AT
problems.
•General inspection <Ref. to AT-5, INSPEC-
TION, General Description.>
•Oil leak
•Stall speed test <Ref. to AT-13, Stall Test.>
•Line pressure test <Ref. to AT-16, Line Pres-
sure Test.>
•Transfer clutch pressure test <Ref. to AT-18,
Transfer Clutch Pressure Test.>
•Time lag test <Ref. to AT-15, Time Lag Test.>
•Road test <Ref. to AT-12, Road Test.>
•Inhibitor switch <Ref. to AT-28, Inhibitor
Switch.>
2 CHECK POWER INDICATOR LIGHT.
Turn the ignition switch to ON.
3 CHECK POWER INDICATOR LIGHT.
1)Turn the ignition switch to OFF.
2)Repair the POWER indicator light circuit or
power supply and ground line circuit.
<Ref. to AT-28, Diagnostic Procedure for
POWER Indicator Light.>
3)Turn the ignition switch to ON.
4 CHECK INDICATION OF DIAGNOSTIC
TROUBLE CODE (DTC).
Calling up the DTC.
Without SUBARU SELECT MONITOR
<Ref. to AT-22, WITHOUT SUBARU SELECT
MONITOR, Read Diagnostic Trouble Code
(DTC).>
With SUBARU SELECT MONITOR
<Ref. to AT-23, WITH SUBARU SELECT
MONITOR, Read Diagnostic Trouble Code
(DTC).>
NOTE:
If the communication function of select monitor
cannot be executed normally, check the com-
munication circuit. <Ref. to AT-37, COMMUNI-
CATION FOR INITIALIZING IMPOSSIBLE,
Diagnostic Procedure for Select Monitor Com-
munication.>
BASIC DIAGNOSTIC PROCEDURE
Is the unit that might influence
AT problem normal?
Does not the POWER indicator
light up?
Is the POWER indicator light
flashing?
Is the DTC displayed?
AT-2
Check
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 6.
NOTE:
Record all DTC.
Yes No
Repair or replace
each item.
Go to step 4.
Go to step 5.
Go to step 5.