Blue is voltage that peaks at 120v it shows two pilot, pre and main injection on acceleration. No post injection happening yet.

Red is current flow, it peaks about 4.5 amps. You can see current drop after the Piezo stack is saturated, voltage is held but no current flow to hold injector open. When voltage is taken away you can see it ramping back down and the current is then spat back out. The 4.5 amps is returned to injector driver unit.

All 5 injectors get the voltage at same time but ECU just earths the one it wants to work.

this is from a Ford Ranger