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96
3.3.6 Injector (gasoline engine)
The fuel injector is an electromechanical device, which is supplied by a common rail fuel pipe and controlled by the
ECM to start and stop time of fuel injection. Generally, it is a 2-wire device, the power supply voltage is 12V, and
the ECM controls the grounding. Limited by cost, some vehicles are equipped with single-point fuel injectors. The
single-point fuel injection pressure is low and the airflow from intake pipe can make a mist of fuel for better
combustion.
Use ATO oscilloscope to test the fuel injector, the specific operation is shown in Figure 3-32:
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