You need to purchase a Haynes Manual and it will detail it for you. The ignition needs to be on, engine not running. You will have to know the proper wires to test. With a volt meter attached the reading with be about .5 volts. As you open the throttle the voltage will rise. It will read not quite 5 volts. The best thing to do is to go to a repair shop that has a labscope. It will tell if there is any glitches in the operation.