Failure to Change Gear From ``D3'' to ``D1''

1. Incorrect fluid level.
2. Faulty or misadjusted throttle sensor.
3. Faulty shift solenoid ``A.''
4. Faulty shift solenoid ``B.''
5. Faulty control valve assembly.
6. Faulty low one-way clutch.
7. Faulty high clutch.
8. Faulty brake band.