Note: Measuring the pressure on the line between the high-pressure fuel pump and the injectors should be carried out after you have made sure that the fuel pressure created by the pump (between the low and high pressure sides) is normal.
1. Connect the MUT-II device to the diagnostic connector.
2. Disconnect the intermediate connector of the injectors (Fig. 6.15, 6.16).
Fig. 6.15. Location of the intermediate injector connector on a vehicle manufactured since 1999
Fig. 6.16. Location of the intermediate injector connector on a vehicle manufactured since 2000
3. Turn the ignition switch key to the ON position.
4. Select item #74 from the Data list menu of the MUT-II instrument.
5. Turn the engine crankshaft with the starter for 2 seconds and visually check for fuel leaks through the connections.
Warning: If fuel leaks are present, stop the engine immediately and eliminate the source of the leak.
6. Make sure that the fuel pressure of at least 1 MPa is maintained for 20 seconds after the engine crankshaft has finished turning with the starter.
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7. If the fuel pressure is below 1 MPa, it means there are leaks in the high-pressure line and it is necessary to check the fuel system.
8. Turn the ignition switch key to the OFF position.
9. Connect the intermediate connector of the injectors.
10. Start the engine and let it idle.
11. With the engine idling, measure the fuel pressure.
Nominal pressure: 4.0-7.0 MPa
12. Make sure that the fuel pressure does not drop at idle speed even after pressing the accelerator pedal several times.
13. If any fuel pressure is out of tolerance, diagnose and repair according to the Fuel System Pressure Diagnostic Chart.
Fuel System Pressure Diagnostic Chart
14. Turn off the engine and turn the ignition switch to the OFF position.
15. Disconnect the MUT-II device from the diagnostic connector.