Check the injector for open or short circuit.Check the wiring between the supply relay and the injector.Injector and wiring are electrically OK.Measure the voltage on the connecting point between the injector(s).To perform these measurements, the relay switching the power to the injectors.On both terminals of the injector is equal to the battery voltage. During the time the injector is switched off, the voltage Injector is switched on, the voltage on this terminal is (almost)Ġ Volt. The other terminal of the injector to ground. The injector is switched on when the control unit connects One of the two terminals is constantly linked to the battery voltage The connector of an injector has two terminals. Injectors are switched on and off by the injection control unit orĮngine management system. Injectors in combination with a constant current limiting circuit The voltage trace of a high impedance or low impedance injector inĪnd C are derived from systems that make use of low impedance Three oscilloscope images are shown below. By means of a constant current limiting circuit in the control unit.Low impedance injectors can be switched on in two different ways: Low impedance injectors have a resistance of about 1 to 2 ohm. Injector is activated, a current of about 0,75 A passes through Have a coil with a resistance of about 15 ohm. Injector coil has a high or low impedance. Needle into the core of the coil, and the fuel is injected. Through the coil, the core is magnetised. Injection systems while top feed injectors are more often used inĮlectrically, the injector consists of a coil. Bottom feed injectors are often used in singlepoint In the case of a bottom feed injector, the petrolĮnters the injector at the bottom, while in a top feed injector, itĮnters from the top. The fuel enters the injector determines whether it is a bottom orĪ top feed injector. Sequential injection systems make it possible toĪdjust the fuel/air ratio and the injection timing for each individualĬylinder to maintain the correct operating condition of the engine.
Multipoint systems, is controlled by the fuel pressure regulator.Īre multipoint systems in which the injectors are activated individuallyįor each cylinder. The fuel pressure in the rail, which amounts to 2 to 3 bar in The fuel from the tank is pumped through a fuel filter to the fuel Of collection and distribution pipe for the fuel. The injectors are connected to the fuel rail. The intake manifold, and inject the fuel in the direction of the intake The injector is mounted in the throttle body and injects Method where the fuel/air mixture is achieved by one centrally placed ByĪdding the fuel to the air sucked in by the engine, a mixture is createdĭepending on the kind of engine management system either one injector per cylinder (multipoint systems) or one injector for all cylinders (singlepoint systems) are used. Valves which accurately control the quantity of fuel delivered.
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