Inspection Using an Oscilloscope (Reference) Purpose

By using an oscilloscope, inspection such as a stuck solenoid valve is made possible without actually removing parts.




(1) When normal
- Counter electromotive voltage A, generated when the three-way solenoid valve or the fuel injector is turned off from on, shows irregular convergence because induced electromotive voltage B, generated by the plunger return operation, is added to it.




(2) When plunger stuck
- When the plunger is stuck, pulse convergence is smooth because no induced electromotive voltage B is generated