ecu doesn't read the coolant sensor

[zaco2356]

hi there i'am luis i have a yaris 2007 sedan, and i have this issue with the radiator fan that does not turn on at all, so i search on the web how to check that the fan engine is working ect, so i think i did a really stupid thing, i unplug the coolang sensor and connect a wire to the positive of the battery and the other end of that wire put it on the coolang sendor plug and spark come off, after that i start the car and almost did'nt star very poorly, i took it to a mechanic and he put the fan engine and the coolang sensor new and the still going on very poorly when i turn on the car i think the ecu is bad, help me out please