Checking the electronic fuel injection system includes checking the functioning of all its subsystems and elements of subsystems.
Examination
1. To check the injectors, start the engine and attach a special stethoscope to each of them. If you hear clicks, then the injector is functioning properly.
2. If the injector does not click, connect a special lamp to the wire contacts of each injector. If the lamp blinks, then the correct voltage is applied to the injector contacts.
3. Stop the engine, disconnect the wires from the injectors and measure the resistance of each injector with an ohmmeter. Compare your results with the specifications.