The check eng. light to not come on when the ing.switch is in the run position

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I've got a 2000 module hyundai elantra the car will turn over but won't start also the check eng. light dont come on when the ing.switch is in the run position. The person I bought the car from was having a problem with it quitting after a hour or two they had a used coil pack put on it and it ran for about three hours then quit and hasn't run since I have put a used ecm ,crankshaft sensor ,camshaft sensor, checked all the fuses and relays but I still haven't had any luck also the coil is not firing and there is no injector pulse and no check engine light. I hooked up an obd2 scanner and it won't read anything so no codes any help would be greatly appreciated