Check the automatic transmission fluid (ATF) level at the intervals recommended by the manufacturer of your vehicle.
Check the fluid level with the engine at normal operating temperature.
If the vehicle is cold, run the engine ten minutes to warm the fluid.
With the car on a level surface, apply the parking brake and start the engine.
CAUTION: Make sure the parking brake is on.
Let the car idle as you move the shift lever through the entire gear range, returning to Park or Neutral.