Open the passenger side door; with the ignition on floor the gas pedal, if the kick down solenoid electrical circuit is working you should hear the kick down solenoid click at the rear of your car. if there is no click then the possibly are: gas pedal out of adjustment and not contacting the switch, a faulty switch, a blow fuse, wiring problem, a bad kick down solenoid or hard o -rings on it . You can check the solenoid by applying 12V directly to it. If you hear a click then the problem could be working pressure or valve body. Make sure the Bowden cable it not to lose.