Subaru 2002 IMPREZA Service Manual page 1723

Symptom
Shock occurs when select lever is moved from "2" to "1" range.
Shock occurs when accelerator pedal is released at medium
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.
SYMPTOM RELATED DIAGNOSTIC
AT-137
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
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
• FWD switch
• Throttle position sensor
• ATF temperature sensor
• Control valve
• Transfer clutch
• Transfer valve
• Transfer pipe
• Transfer duty solenoid
• TCM
• FWD switch
• Transfer clutch
• Transfer valve
• Transfer duty solenoid
• Select cable
• Select lever
• Detente spring
• Manual plate
• Detente spring
• Manual plate
• Select cable
• Select lever
• Detente spring
• Manual plate