Subaru IMPREZA 2002 Service Manual page 223

SYMPTOM RELATED DIAGNOSTIC
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
3vmPtom
Shock occurs when the select lever is moved from "2" to "1"
.ange.
Shock occurs when the accelerator pedal is released at
nedium speeds.
Vibration occurs during straight-forward operation.
Vibration occurs during turns (tight corner "braking" phenome-
non).
Front wheel slippage occurs during standing starts.
Vehicle is not set in FWD mode.
Select lever is hard to move.
Select lever is too high to move (unreasonable resistance).
Select lever slips out of operation during acceleration or while
driving on rough terrain.
Problem parts
TCM
Throttle position sensor
ATF temperature sensor
Line pressure duty solenoid
Control valve
Low & reverse clutch
ATF deterioration
2-4 brake duty solenoid
2-4 brake timing solenoid
Low clutch timing solenoid
TCM
Throttle position sensor
ATF temperature sensor
Line pressure duty solenoid
Control valve
Lock-up damper
Engine performance
2-4 brake duty solenoid
2-4 brake timing solenoid
Low clutch timing solenoid
TCM
Lock-up duty solenoid
Lock-up facing
Lock-up damper
TCM
Front vehicle speed sensor
Rear vehicle speed sensor
Throttle position sensor
ATF temperature sensor
Transfer clutch
Transfer valve
Transfer duty solenoid
ATF deterioration
Harness
TCM
Front vehicle speed sensor
Throttle position sensor
ATF temperature sensor
Control valve
Transfer clutch
Transfer valve
Transfer pipe
Transfer dutv solenoid
TCM
Transfer clutch
Transfer valve
Transfer duty solenoid
Select cable
Select lever
Detent spring
Manual date
Detent spring
Manual plate
Select cable
Select lever
Detent spring
Manual plate
AT-1 31