You can check the pressure by placing a gage in the port on the L/H side of the trans.you should see a pressure of 35-75 psi. The converter is a little dificult to tell if the car does not move. If the car is drivable you may notice a higher then normal engine rpm and a reduction in your fuel milage. hays trans manual has a troubleshooting section that is very helpfull. good luck!