Subaru Legacy III (2000-2003 year). Service manual — part 607
AT-162
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
SYMPTOM RELATED DIAGNOSTIC
No shift occurs from 3rd to 4th gear.
• TCM
• Shift solenoid 1
• ATF temperature sensor
• Control valve
• 2-4 brake
Engine brake is not effected when select lever is in “3” range.
• Inhibitor switch
• TCM
• Throttle position sensor
• Control valve
Engine brake is not effected when select lever is in “3” or “2”
range.
• Control valve
Engine brake is not effected when select lever is in “1” range.
• Control valve
• Low & reverse brake
Shift characteristics are erroneous.
• Inhibitor switch
• TCM
• Front vehicle speed sensor
• Rear vehicle speed sensor
• Throttle position sensor
• Control valve
• Ground earth
No lock-up occurs.
• TCM
• Throttle position sensor
• ATF temperature sensor
• Control valve
• Lock-up facing
• Engine speed signal
Parking brake is not effected.
• Select cable
• Select lever
• Parking mechanism
Shift lever cannot be moved or is hard to move from “P” range.
ATF spurts out.
• ATF level too high
Differential oil spurts out.
• Differential gear oil too high
Differential oil level changes excessively.
• Seal pipe
• Double oil seal
Odor is produced from ATF supply pipe.
• High clutch
• 2-4 brake
• Low & reverse clutch
• Reverse clutch
• Lock-up facing
• ATF deterioration
Shock occurs from 1st to 2nd gear.
• TCM
• Throttle position sensor
• 2-4 brake duty solenoid
• ATF temperature sensor
• Line pressure duty solenoid
• Control valve
• 2-4 brake
• ATF deterioration
• Engine performance
• 2-4 brake timing solenoid
Slippage occurs from 1st to 2nd gear.
• 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
• High clutch
Symptom
Problem parts
AT-163
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
SYMPTOM RELATED DIAGNOSTIC
Shock occurs from 2nd to 3rd gear.
• 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
Slippage occurs from 2nd to 3rd gear.
• 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
Shock occurs from 3rd to 4th gear.
• 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
Slippage occurs from 3rd to 4th gear.
• 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
Shock occurs when select lever is moved from “3” to “2” range.
• 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
Shock occurs when select lever is moved from “D” to “1” range.
• 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 timing solenoid
Symptom
Problem parts
AT-164
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
SYMPTOM RELATED DIAGNOSTIC
Shock occurs when select lever is moved from “2” to “1” range.
• 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
Shock occurs when accelerator pedal is released at medium
speeds.
• 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
Vibration occurs during straight-forward operation.
• TCM
• Lock-up duty solenoid
• Lock-up facing
• Lock-up damper
Vibration occurs during turns (tight corner “braking” phenome-
non).
• 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
• Hold switch
Front wheel slippage occurs during standing starts.
• TCM
• Front vehicle speed sensor
• FWD switch
• Throttle position sensor
• ATF temperature sensor
• Control valve
• Transfer clutch
• Transfer valve
• Transfer pipe
• Transfer duty solenoid
Vehicle is not set in FWD mode.
• TCM
• FWD switch
• Transfer clutch
• Transfer valve
• Transfer duty solenoid
Select lever is hard to move.
• Select cable
• Select lever
• Detent spring
• Manual plate
Select lever is too high to move (unreasonable resistance).
• Detent spring
• Manual plate
Symptom
Problem parts
AT-165
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
SYMPTOM RELATED DIAGNOSTIC
Select lever slips out of operation during acceleration or while
driving on rough terrain.
• Select cable
• Select lever
• Detent spring
• Manual plate
System does not shift to SPORT shift mode.
SPORT shift mode switch
Engine brake is not effected in SPORT shift mode with 1st gear.
• SPORT shift solenoid
• Control valve
• Low and reverse clutch
Symptom
Problem parts
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