Friend, it is super important that the lands from the place where they are connected to the computer, separately, disconnected the computer, so you will not have the masses bridged by the Schunts of the circuit, which can lead you to a wrong reading. Now, the Daihatsu, monitor the status of the alternator, also suspects the connections of the computer tab, which can have loose contacts in their pins, or with sulfate that can make contacts resistive. It is my experience in the electronic service of the car, which daily arrives and that is what I dedicate to me. It is good that you do it with a manual to follow the signal patterns and track them with an oscilloscope, to determine the moment when the event happens. Regarding manuals, you can also serve by some Toyota, since the engines are originally from that brand, and the Ecus too. Luck. Valdivian.