Pressure Switch

Remove green lead from connector on transmission kickdown switch. Switch ON ignition and touch lead to connector, solenoid valve should be heard to operate. Reconnect lead to switch and turn OFF ignition. Partially disconnect green-orange lead from solenoid valve and connect test lamp between this lead and ground. Turn ignition ON, test lamp should NOT light and solenoid should be heard to operate. Drive car up to 40 MPH, test lamp should come ON between 35 to 40 MPH. If not, pressure switch is faulty and must be replaced.