Abstract:
The invention relates to a drive circuit (20a) for an injector arrangement comprising a fuel injector (12a,12b), and a method of detecting faults in the drive circuit (20a). The drive circuit (20a) comprises diagnostic means (R F ). The diagnostic means (R F ) is operable to sense a detected current (I dect ) and to provide a fault signal on detection of a fault, when the detected current (I dect ) is at variance from a threshold current (I trip ).