Checking the engine power system

The main indicator of the health of the engine power system is the fuel pressure in the fuel rail. But first, we recommend checking the condition of the air filter (see «Removal and installation of the air filter»), since this work is simple and does not take much time. After you make sure that the air filter is clean, check the reliability of the electrical contacts in the blocks with wires of the injection system units responsible for supplying fuel (electric fuel pump, injectors).



To check the pressure in the fuel rail, use a pressure gauge with a rubber hose that fits the diameter of the test fitting on the fuel rail.

1. Turn on the ignition and listen: within a few seconds you should hear the sound of the electric fuel pump. If it is not audible, check the electrical supply circuit of the electric fuel pump.

2. Check the pressure in the fuel supply system by connecting a pressure gauge to the fitting on the fuel rail in the engine compartment (see «Checking the fuel pressure in the engine power system»).

The following reasons for pressure drop are possible:



– The regulator of pressure of fuel is faulty. The regulator is located in the fuel pump module;




– the fuel filter is littered;



– the fuel pump is faulty.

You can find ways to troubleshoot these problems in Sec. «Engine» (see «Engine power system»).