Subaru 2009 IMPREZA Service Manual page 2073

AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Shock occurs when accelerator pedal is released from medium
speed.
Vibration occurs during straight-forward operation.
Vibration occurs during turns. (Tight corner braking phenomenon)
Front wheel slippage occurs during standing starts.
It is not set in FWD mode.
Select lever is hard to move.
Select lever is excessively hard to move. (Unreasonable resistance)
Select lever slips out of selected shift position during acceleration or
while driving on rough terrain.
Manual mode can not be set.
Gear does not change though the select lever is operated in manual
mode.
AWD warning light remains blinking or illuminated.
Diagnostics with Phenomenon
Symptom
4AT(diag)-88
Problem parts
• TCM
• Accelerator pedal position sensor
• ATF temperature sensor
• Line pressure linear solenoid
• Control valve
• Lock-up damper
• Engine performance
• TCM
• Lock-up duty solenoid
• Lock-up facing
• Lock-up damper
• TCM
• Front vehicle speed sensor
• Rear vehicle speed sensor
• Accelerator pedal position sensor
• ATF temperature sensor
• Transfer clutch
• Transfer valve
• Transfer duty solenoid
• ATF deterioration
• Harness
• TCM
• Front vehicle speed sensor
• Accelerator pedal position sensor
• ATF temperature sensor
• Control valve
• Transfer clutch
• Transfer valve
• Transfer pipe
• Transfer duty solenoid
• TCM
• Transfer clutch
• Transfer valve
• Transfer duty solenoid
• Fuse
• Select cable
• AT select lever
• Detent spring
• Manual plate
• Detent spring
• Manual plate
• Select cable
• AT select lever
• Detent spring
• Manual plate
• SPORT/manual mode switch
• TCM
• Body integrated unit
• Up shift switch
• Down shift switch
• TCM
• Body integrated unit
• Tire size
• Tire pressure
• TCM
• FWD fuse holder
• Harness