This duration or period is referred to as the injector pulse width.Ī typical pulse width is 2 to 4 milliseconds at idle and as high as 15 to 18 milliseconds at wide open throttle.Ĭurrent flow through the winding will result in the creation of a large magnetic field, which has the effect of “attracting” the pintle valve into the winding. When the injector is to be actuated, the engine control module connects the negative side of the winding to ground through a transistor.Ĭurrent will flow through the injector winding until the path to ground is interrupted. In the diagram below the fuel injector is supplied with a hard live from a fuse. High pressure injectors fitted to direct injection spark ignition and common rail compression ignition engines use hydraulic imbalance to open the injector, so this test is not suitable for these applications. This test is only applicable to low pressure fuel injectors due to the construction and operation of the injector. The mechanical operation of a fuel injector on a spark ignition engine can be assessed with an oscilloscope using a two channel test. See how a Snap-on lab scope and diagnostic software can help you check voltage and amperage to guide you to a diagnosis when working on a faulty fuel injector.
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