Look I have a diagnostic team is a SPC Max, it is very good and to read the computer you have the engine in contact, and for the load measurements and 'Parameters it will be for that reason it catches my attention that disconnects the battery to read it, but you want what happened is that you understood badly and to prescribe the computer you must disconnect the battery in some models. Good luck and greetings any questions just ask that we are here to help.
They usually have two plugs per devajo that is to remove the oil and one by the side to fill it, you lean it with the help of a hose and when you eat to vote where you are filling it for and close, if you do not have side plug, fill it through the cash measurement rod, non -motor box.