Subaru Impreza 2003 Service Manual page 1672

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
4AT-4, Check List for Interview.>
2)Before performing the diagnosis, inspect fol-
lowing items which might influence the AT
problems.
•General inspection <Ref. to 4AT-5, INSPEC-
TION, General Description.>
•Oil leak
•Stall speed test <Ref. to 4AT-34, Stall Test.>
•Line pressure test <Ref. to 4AT-37, Line Pres-
sure 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-33, Road Test.>
•Inhibitor switch <Ref. to 4AT-48, 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 4AT-31, Diagnostic Procedure for
POWER Indicator Light.>
3)Turn the ignition switch to ON.
4 CHECK INDICATION OF DTC.
Calling up the DTC.
Without Subaru Select Monitor
<Ref. to 4AT-24, WITHOUT SUBARU
SELECT MONITOR, Read Diagnostic Trouble
Code (DTC).>
With Subaru Select Monitor
<Ref. to 4AT-25, 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 4AT-38, COMMU-
NICATION FOR INITIALIZING IMPOSSIBLE,
Diagnostic Procedure for Select Monitor Com-
munication.>
BASIC DIAGNOSTIC PROCEDURE
Is the unit that might influence
AT problem normal?
Does the POWER indicator
light illuminate?
Is the POWER indicator light
illuminate?
Is the DTC displayed?
4AT-2
Check
Go to step 2.
Go to step 4.
Go to step 4.
Go to step 6.
NOTE:
Record all DTC.
Yes No
Repair or replace
each item.
Go to step 3.
Go to step 5.
Go to step 5.