I rebuilt my ej253 after my head gasket failed, after install my engine wouldn't roll over or go out of park. I jumped the starter and checked the fuse and relay... all good. Went back through to check all the connections and grease them and also touched battery terminals to reset the system. The battery is good. I need some help here. The only thing that I can think of is I connected the battery with the engine out earlier to get it out of park to move it. Not sure if that could affect the ecu in anyway. I need some help here.