Subaru IMPREZA 2002 Service Manual page 222

SYMPTOM RELATED DIAGNOSTIC
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Symptom
Shock occurs from 2nd to 3rd gear.
Slippage occurs from 2nd to 3rd gear.
r
Slippage occurs from 3rd to 4th gear.
Shock occurs when the select lever is moved from " 3 to " 2
I
Shock occurs when the select lever is moved from " 0 to "1"
range.
Problem parts
TCM
Throttle position sensor
2-4 brake duty solenoid
ATF temperature sensor
Line pressure duty solenoid
Control valve
High clutch
2-4 brake
ATF deterioration
Engine performance
2-4 brake timing solenoid
TCM
Throttle position sensor
2-4 brake duty solenoid
ATF temperature sensor
Line pressure duty solenoid
Control valve
High clutch
2-4 brake
2-4 brake timing solenoid
TCM
Throttle position sensor
2-4 brake duty solenoid
ATF temperature sensor
Line pressure duty solenoid
Control valve
2-4 brake timing solenoid
2-4 brake
ATF deterioration
Engine performance
Low clutch timing solenoid
Low clutch
TCM
Throttle position sensor
2-4 brake duty solenoid
ATF temperature sensor
Line pressure duty solenoid
Control valve
2-4 brake
2-4 brake timing solenoid
TCM
Throttle position sensor
ATF temperature sensor
Line pressure duty solenoid
Control valve
2-4 brake duty solenoid
2-4 brake
ATF deterioration
2-4 brake timing solenoid
TCM
Throttle position sensor
ATF temperature sensor
Line pressure duty solenoid
Control valve
ATF deterioration
2-4 brake duty solenoid
2-4 brake timing solenoid
Low clutch timinu solenoid
AT-I 30