Subaru 2002 IMPREZA Service Manual page 1720

AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Symptom
Vehicle does not start in any shift range (engine revving up).
Vehicle does not start in "R" range only (engine revving up).
Vehicle does not start in "R" range only (engine stalls).
Vehicle does not start in "D", "3" range only (engine revving up).
Vehicle does not start in "D", "3" or "2" range only (engine rev-
ving up).
Vehicle does not start in "D", "3" or "2" range only (engine
stalls).
Vehicle starts in "R" range only (engine revving up).
Acceleration during standing starts is poor (high stall rpm).
Acceleration during standing starts is poor (low stall rpm).
Acceleration is poor when select lever is in "D", "3" or "2" range
(normal stall rpm).
Acceleration is poor when select lever is in "R" (normal stall
rpm).
No shift occurs from 1st to 2nd gear.
No shift occurs from 2nd to 3rd gear.
SYMPTOM RELATED DIAGNOSTIC
AT-134
Problem parts
• Strainer
• Line pressure duty solenoid
• Control valve
• Drive pinion
• Hypoid gear
• Axle shaft
• Differential gear
• Oil pump
• Input shaft
• Output shaft
• Planetary gear
• Drive plate
• ATF level too low
• Front gasket transmission case
• Select cable
• Select lever
• Control valve
• Low & reverse clutch
• Reverse clutch
• Low clutch
• 2-4 brake
• Planetary gear
• Parking brake mechanism
• Low clutch
• One-way clutch
• Low clutch
• Reverse clutch
• Control valve
• Control valve
• Low clutch
• Reverse clutch
• ATF level too low
• Front gasket transmission case
• Differential gear oil level too high or too low
• Oil pump
• Torque converter one-way clutch
• Engine performance
• TCM
• Control valve
• High clutch
• 2-4 brake
• Planetary gear
• Control valve
• High clutch
• 2-4 brake
• Planetary gear
• TCM
• Rear vehicle speed sensor
• Front vehicle speed sensor
• Throttle position sensor
• Shift solenoid 1
• Control valve
• 2-4 brake
• TCM
• Control valve
• High clutch
• Shift solenoid 2