For 1990-2009 cars

Problem | Action
--- | ---
Fluid pump is internally leaking | Inspect the fluid pump.
Fluid pump drive and driven gears worn or damaged | Repair the fluid pump drive and the driven gears.
Fluid pump cover seal rings cut or damaged | Inspect the fluid pump seal rings.
Fluid pump body or cover casting is porous or damaged | Repair/replace the fluid pump.
Throttle valve cable out of adjustment, binding or damaged | Adjust or replace the throttle valve cable.
Throttle valve cable link is loose or disconnected | Inspect the throttle valve cable link.
Valve body spacer plate or gaskets not positioned correctly or damaged | Inspect the valve body.
The check balls are omitted or not positioned correctly or damaged | Inspect the valve body.
Manual valve binding or sticking | Inspect the valve body.
Manual valve link is disconnected | Inspect the manual valve link.
Primary regulator valve binding or sticking | Inspect the valve body.
Case internal leak in forward clutch fluid circuit | Repair and replace the case.
Case internal leak in direct clutch fluid circuit | Repair and replace the case.
Case fluid passages blocked or restricted | Repair and replace the case.