Subaru Legacy 2002 Service Manual page 1907

Automatic Transmission (Diagnostics)
Symptom
No shift occurs from 3rd to 4th gear.
Engine brake is not effected when select lever is in "3" range.
Engine brake is not effected when select lever is in "3" or "2"
range.
Engine brake is not effected when select lever is in "1" range.
Shift characteristics are erroneous.
No lock-up occurs.
Parking brake is not effected.
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 from 1st to 2nd gear.
Slippage occurs from 1st to 2nd gear.
SYMPTOM RELATED DIAGNOSTIC
AT-138
Problem parts
¼ TCM
¼ Shift solenoid 1
¼ ATF temperature sensor
¼ Control valve
¼ 2-4 brake
¼ Inhibitor switch
¼ TCM
¼ Throttle position sensor
¼ Control valve
¼ Control valve
¼ Control valve
¼ Low & reverse brake
¼ Inhibitor switch
¼ TCM
¼ Front vehicle speed sensor
¼ Rear vehicle speed sensor
¼ Throttle position sensor
¼ Control valve
¼ Ground earth
¼ TCM
¼ Throttle position sensor
¼ ATF temperature sensor
¼ Control valve
¼ Lock-up facing
¼ Engine speed signal
¼ Select cable
¼ Select lever
¼ Parking mechanism
¼ ATF level too high
¼ Differential gear oil too high
¼ Seal pipe
¼ Double oil seal
¼ High clutch
¼ 2-4 brake
¼ Low & reverse clutch
¼ Reverse clutch
¼ Lock-up facing
¼ ATF deterioration
¼ TCM
¼ Throttle position sensor
¼ 2-4 brake duty solenoid
¼ ATF temperature sensor
¼ Line pressure duty solenoid
¼ Control valve
¼ 2-4 brake
¼ ATF deterioration
¼ Engine performance
¼ 2-4 brake timing solenoid
¼ TCM
¼ Throttle position sensor
¼ 2-4 brake duty solenoid
¼ ATF temperature sensor
¼ Line pressure duty solenoid
¼ Control valve
¼ 2-4 brake
¼ 2-4 brake timing solenoid
¼ High clutch