eurotech

Hi Ive got a 91 c4 with a problem concerning the brake booster. The pump will run with the key on engine off, but will not run with the engine running. As soon as I start the car the terminal x relay loses power. If I jump the relay the pump will run till the pressure switch cuts out and all is fine. Cant source a good wiring diagram for this system. Shoudn't the Term X relay be energized anytime the key is on. Thanks for the help.

Aaon Murphy