Subaru 2009 IMPREZA Service Manual page 1914

AUTOMATIC TRANSMISSION
18.Control Valve Body
A: REMOVAL
1) Set the vehicle on a lift.
2) Disconnect the ground cable from battery.
3) Lift up the vehicle.
4) Clean the transmission exterior.
5) Remove the drain plug (ATF) to drain ATF.
CAUTION:
Directly after the vehicle has been running or
the engine has been long idle running, the ATF
is hot. Be careful not to burn yourself.
6) Perform replacement with a new gasket, and
tighten the drain plug (ATF).
Tightening torque:
25 N·m (2.5 kgf-m, 18.4 ft-lb)
7) Remove the oil pan.
CAUTION:
Be careful not to allow foreign matter such as
dust or dirt to enter the oil pan.
8) Remove the magnet.
9) Clean the magnet.
10) Completely remove the remaining liquid gasket
on the transmission case and oil pan.
Control Valve Body
11) Disconnect the control valve connector.
12) Remove the oil cooler pipe.
AT-03117
13) Remove the control valve body.
NOTE:
The control valve body is replaced as an assembly
only, because it is a non-disassembly part.
AT-03118
4AT-58
AT-04838
AT-00059
AT-04833