Just another comment. Can you show how to take a 3-wire sensor (input to CPU) and tell which wire is which without a schematic? One is ground the other is VCC and the other is the signal to the CPU. I suppose I could read the voltage at the sensor connector using a back-probe pin test lead with power applied by having the ignition key turned to position 2 (not the accessory position). I could get Ground and VCC using this method and by default the other is the signal pin.
where i get confused is knowing if a wire connected to a pcm and module/device if its a input or output?many times i look at wire diagram and you have no way of telling
