SEQUENCE OF WORK
1. A faulty injector can be identified with a bare hand, as a normally working injector should vibrate when the engine is running. This check must be carried out on a cold engine.
2. Disconnect the electrical connector from the injector and connect the LED probe to the connector pins (not a control lamp).
3. Start the engine. The probe LED must flash, otherwise no voltage is applied to the connector pins. Perhaps in this case the engine control unit is faulty, which can only be checked in a car repair shop.
4. Disconnect the electrical connector from the injector and measure the resistance between the two connector pins on the injector. At 20°C, the nozzle resistance should be (14,5±1) Ohm.
5. If the injector resistance is significantly different from the required one, replace the injector.
6. Remove the distributive fuel pipeline together with atomizers.
7. Disconnect from atomizers electric sockets, thus fuel lines have to remain attached.
8. Switch the ignition on and off several times to allow the fuel pump to pressurize the fuel system.
Injector leak test
9. Check the injectors for leaks one by one. Only one drop of fuel should come out of each injector, if more fuel comes out, replace the injector.
10. If it is necessary to check the fuel spray pattern, the fuel distribution pipe must be removed. The fuel lines must remain connected to the injectors. Disconnect from all injectors, except for the one being tested, the electrical connectors and install a special glass vessel under the injector to be tested.
11. Turn on the ignition, the injector under test should spray fuel in a cone shape.
12. Repeat checks on other nozzles.
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