Subaru IMPREZA 2004 Service Manual page 5

Basic Diagnostic Procedure
ENGINE (DIAGNOSTICS)
2. AUTOMATIC TRANSMISSION
When the DTC about automatic transmission is
shown on display, carry out the following basic
check. After that, carry out the replacement or re-
pair work.
1) ATF level check <Ref. to 4AT-31, Automatic
Transmission Fluid.>
2) Differential gear oil level check <Ref. to 4AT-33,
Differential Gear Oil.>
3) ATF leak check <Ref. to 4AT-31, Automatic
Transmission Fluid.>
4) Differential gear oil leak check <Ref. to 4AT-33,
Differential Gear Oil.>
5) Stall test <Ref. to 4AT-35, Stall Test.>
6) Line pressure test <Ref. to 4AT-38, Line Pres-
sure Test.>
7) Transfer clutch pressure test <Ref. to 4AT-39,
Transfer Clutch Pressure Test.>
8) Time lag test <Ref. to 4AT-37, Time Lag Test.>
9) Road test <Ref. to 4AT-34, Road Test.>
10) Shift characteristics <Ref. to 4AT-39, Transfer
Clutch Pressure Test.>
EN(H4SO)(diag)-3