Won't be as fancy as zaza's drawings, but here you go. The text below the schematic explains what reading you should see. Note: This is a generic high voltage solenoid circuit, use the manual to identify the specific components.
Put your probe on point A and then trigger the solenoid. The signal should go from high to low. The reverse will happen at point B when the solenoid is triggered.
You can always compare to another circuit to validate your methodology.