For 1990-2009 cars

Problem | Action
--- | ---
Low fluid level | Add fluid.
Throttle valve cable out of adjustment, binding or damaged | Adjust or replace the throttle valve cable.
Throttle valve binding or sticking | Inspect the valve body.
2-3 shift valve binding or sticking | Inspect the valve body.
Primary regulator valve binding or sticking | Inspect the valve body.
Intermediate servo piston binding or sticking | Inspect the intermediate servo seals.
Intermediate servo piston rod not engaged | Inspect the intermediate servo piston.
2nd brake band not releasing | Inspect the 2nd brake band.
Torque converter internal damage | Replace the torque converter.
Direct clutch discs are worn | Replace the direct clutch discs.
Direct clutch piston or seal is leaking or damaged | Inspect the direct clutch piston and seal.
Incorrect fluid pressure | Perform the line pressure diagnosis.