2. Disconnect the high pressure fuel hose from the high pressure fuel pump.
Caution: Cover the hose connection with a rag to prevent fuel from splashing due to residual pressure in the high-pressure line.
Fig. 8.3. Special tool for measuring the pressure between the high-pressure fuel hose and the high-pressure fuel pump: 1 – to the high pressure fuel pump; 2 – gasket; 3 – special tool МВ991637; 4 – special tool МВ998709; 5 – special tool МВ998742; 6 – to the high pressure fuel hose
3. Disconnect the coupling and bypass bolt from the hose adapter and connect the special tool to the hose adapter instead (Fig. 8.3).
4. Install the special tool (for measuring pressure) between the high-pressure fuel hose and the high-pressure fuel pump.
5. Connect the fuel pressure sensor to the special fuel pressure measuring tool, placing a gasket between them.
6. Connect the fuel pressure sensor wire to the power source (cigarette lighter) and to the MUT-II device.
7. When using a pressure gauge, do the following:
- install the pressure gauge on a special pressure measuring instrument, placing a sealing ring or gasket between them;
- install a special tool with a pressure gauge assembly between the high-pressure fuel hose and the high-pressure fuel pump.
8. Connect the MUT-II device to the diagnostic connector.
9. Turn the ignition key to the "ON" position (but do not start the engine).
Caution: Always switch off the ignition before connecting or disconnecting the MUT–II.
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10. Select the desired menu item "Actuator test" of the MUT-II to operate the low-pressure fuel pump (from the fuel tank side). Check for leaks at the connection points.
11. Exit the Actuator test mode or turn the ignition key to the OFF position.
12. Start the engine and let it idle.
13. With the engine idling, measure the fuel pressure (nominal fuel pressure is approximately 324 kPa).
14. Make sure that the fuel pressure does not drop at idle speed even after pressing the accelerator pedal several times.
15. If the fuel pressure does not correspond to the required value, determine the faults and eliminate them in accordance with Table 8.1.
16. Turn off the engine and check for changes in the pressure gauge readings. The fuel system is in good order if the pressure in the fuel line does not decrease within 2 minutes. If the pressure decreases, determine the faults and eliminate them in accordance with Table 8.2.
17. Relieve any residual pressure in the fuel line.
18. Disconnect the fuel pressure gauge and special tool from the high pressure fuel pump.
Table 8.1. Identifying faults and methods for troubleshooting when the fuel pressure does not correspond to the required level
Table 8.2. Identifying faults and troubleshooting methods in case of decreased fuel pressure
Caution: Cover the hose connections with a rag to prevent fuel from splashing due to residual pressure in the fuel line.
19. Replace the O-ring with a new one installed on the high-pressure fuel hose. Before installing the gasket, apply a layer of engine oil to its surface.
20. Connect the high pressure fuel hose to the high pressure fuel pump and tighten the flange mounting bolts to the specified torque.
21. Check for fuel leaks through connections.
22. Disconnect the MUT-II device.