Subaru 2009 IMPREZA Service Manual page 2071

AUTOMATIC TRANSMISSION (DIAGNOSTICS)
No shift occurs from 3rd to 4th gear.
Engine brake is not effected when select lever is shifted from 4th
gear to 3rd gear.
Engine brake is not effected when select lever is shifted from 3rd
gear to 2nd gear.
Engine brake is not effected when select lever is shifted from 2nd
gear to 1st gear.
Shift characteristics are erroneous.
No lock-up occurs.
Parking brake does not function.
Shift lever cannot be moved or is hard to move from "P" range.
ATF spurts out.
Differential oil spurts out.
Differential oil level changes excessively.
Odor is produced from ATF supply pipe.
Shock occurs when shifting from 1st to 2nd gear.
Slippage occurs when shifting from 1st to 2nd gear.
Diagnostics with Phenomenon
Symptom
4AT(diag)-86
Problem parts
• TCM
• ATF temperature sensor
• Control valve
• 2-4 brake
• Inhibitor switch
• TCM
• Accelerator pedal position sensor
• Control valve
Control valve
• Control valve
• Low & reverse brake
• Inhibitor switch
• TCM
• Front vehicle speed sensor
• Rear vehicle speed sensor
• Accelerator pedal position sensor
• Control valve
• Ground
• TCM
• Accelerator pedal position sensor
• ATF temperature sensor
• Control valve
• Lock-up facing
• Engine speed signal
• Select cable
• AT select lever
• Parking mechanism
ATF level too high
Differential gear oil level too high
• Seal pipe
• Double oil seal
• High clutch
• 2-4 brake
• Low & reverse clutch
• Reverse clutch
• Lock-up facing
• ATF deterioration
• TCM
• Torque converter turbine speed sensor
• Accelerator pedal position sensor
• 2-4 brake duty solenoid
• ATF temperature sensor
• Line pressure linear solenoid
• Control valve
• 2-4 brake
• ATF deterioration
• Engine performance
• Low & reverse duty solenoid
• TCM
• Acceleration pedal position sensor
• 2-4 brake duty solenoid
• ATF temperature sensor
• Line pressure linear solenoid
• Control valve
• 2-4 brake