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Look at your fuel injector and find the harness connector. Disconnect the wiring of the harness connector from the fuel injector. It may be difficult to locate the connector but all you need is to look for the fuel injector and than find the wiring.
Get the noid light and plug the two prongs into the end of the harness connector.
Turn off the ignition. Be sure that the ignition will not work. To be sure, you need to dislocate the engine from the starter motor.
Now check the noid light. What you need to look at is the flashing light. If the noid light gives a quick flash, it means that voltage signal is going to your fuel injector. If the noid light is not flashing, it means that your fuel injector is having problems. It can be with the wiring circuit or with the power feed of the fuel injector. It can be that the wires or the car's computer are having problems.
Check each fuel injector. When the noid light for both has flashing lights, it means that the problem is not in the voltage. It can be in the electricity of the fuel injector. You can check it with the use of an ohmmeter.
Make sure that you don't press down the pedal for acceleration when you are using the noid light.
When performing this test, make sure to not press the accelerator pedal.
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