If you dont know what to do then stop doing anything and take it to a shop or a person who does know before things get even more messed up. A P0201 is an injector circuit code or malfunction with an injector. There are only 2 wires going to an injector. Power (supplied to all 4 injectors off of one power circuit) and the wire for the ECU to control the injector itself. So you have 1 power wire that splits into 4 wires each one of those going to an injector. Then you have 4 separate wires for the ECU to ground each injector out in order to fire them. You need to make sure that the wire for cylinder one injector control is good between the ECU and the injector (cylinder 1 in your case) by doing a resistance check. Check the resistance from the ECU plug to the injector (WITH THE ECU DISCONNECTED, BATTERY DISCONNECTED) and verify the you have less than 2 ohms resistance. Then check that wire to ground (I.E. the engine block, negative ground cable etc. It should have no continuity to ground as that would mean it is shorted to ground.
Get yourself a spare headlamp bulb from an auto parts store and a spare connector for it from the help section. You are gonna use this to make yourself a high load test light for testing electrical circuits. You can have low resistance cause one strand of wire is ok, but the rest of the strands are damaged and will not let enough amperage to flow. If you connect the test light to one end of a wire, the other wire from the lamp to ground, and the apply power to the opposite end of the circuit for a second if the bulb lights it means that wire can carry a high load. This is important, because you can have the voltage but not the flow. Whatever you do, do not ever under any circumstances apply power to the ECU side of a circuit. This can cause them to get damaged.
What tool are you using to check the wiring, is it a cheap multi meter or are you even using one?
