connections

When connecting the Picoscope to measure crankshaft sensor which is an inductive sensor and both sensor wires goes to the PCM (+ and -). Which wire do you use to see pattern on scope?

This depends on internal PCM circuit design. If the (-) is a true ground, the signal will be only on the (+) wire. IF the the circuit uses a "floating" ground, you will see a signal on BOTH wires, but the oscillations will mirror each other, rather than line-up/stack.

You can connect your scope a couple different ways. If you ground/reference your scope to battery (-), you can use two scope channels and watch both wires (Sensor (-) and (+) )at the same time. Or, you can ground/reference you scope the to the Sensor (-) and use a single channel on the sensor (+).