Technician A says that the Siemens HEUI is equipped with an ON coil and OFF coil arranged on either side of the actuator spool. Technician B says that when the Siemens HEUI ON coil is energized, actuation oil is vented from the HEUI actuation circuit. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because the Siemens HEUI system does indeed use an ON coil and an OFF coil arranged on either side of the actuator spool to control the flow of oil in the HEUI actuation circuit. Technician B is incorrect because when the ON coil is energized, it doesn't vent actuation oil from the circuit; instead, it helps to control the flow and pressure of the oil to actuate the injector.

Technician a Says That the Siemens HEUI Is Equipped with an ON Coil