Fuel injector for diesel engine mounted in vehicle, has ground determining unit which determines ground at portion downstream of pump control valve (PCV), in the state in which PCV and pressure reducing valve (PRV) are not selected

摘要

The fuel injector has a controller (8) which drives a PCV (3) and a PRV (6) selectively. The PCV controls the ejection amount of a high pressure pump to discharge fuel at high pressure. A PRV reduces the pressure of the fuel discharged by the high pressure pump. A power supply voltage detecting unit (28) detects voltage applied to the PCV and the PRV. A ground determining unit determines ground at a portion downstream of the PCV, when certain voltage is applied to the PCV and the PRV, in a state in which the PCV and the PRV are not selected.