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If you stick 12v of power to it the injector should open up to spray gas. (I wouldn't just stick 12V on it, it could damage the coil from too much current. My Toyota shop manual shows a special service tool that is a cable and resistor, to limit current flow.)

or you could use a Digital Voltage OHM Meter and measure the resistance across the terminals of the injector. make sure vehicle is off and key out of the ignition. if the resistance is not within specification(can be found in vehicle specific manual or through dealership) replace that injector. First check that the electrical system is operating correctly by listening for a clicking sound from each injector, then if you cannot tell which one did not click you then proceed by disconnecting each injector wire in turn and connecting it to a noid light ( a 12 volt light bulb with 2 wires ) , when you turn the engine over the bulb should flash mimicking the injector pulse. If they are all good ( actually I think you would only need to check a couple ) move on to the ohm meter test, check ohms against a known good injector if you do not have the specs or look for variation across all the injectors. Also check the injector terminals to ground, if continuity is detected replace. If all is still good, disconnect the fuel rail and with some mechanics wire attach the injectors and crank the engine, a good injector will have a cone shaped spray.

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βˆ™ 2009-07-12 00:29:41
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Q: How do you test a fuel injector to see if it is bad?
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