mustangmdr

I keep getting trouble codes for the ect,bp,tps,act sensors.I know there is nothing wrong with the tps or ect because they are new.I get these codes as soon as I turn the key to test it with the scan tool.I dont have to start it for these codes to come up and if I clear them, turn the key off then back on and scan it they are back on it. The ect code says its reading above 234 degrees orthe circuit is shorted to ground,what does shorted to ground mean? The rest of the codes are out of self test range or voltage codes for the other sensors.I have tried everything I even got a new computer with no luck of getting rid of these codes.Also another strange thing is that whenever I try to change the bp sensor with a new one it shorts the computer but if I leave the old sensor in it is fine,all it does with the old one is throw a code.What could be causing all of this? The car runs and drives ok but I know with these sensors not working it could be running better. [align=right][/align]