Connect the tester to the diagnostic socket.
Disconnecting the intermediate connector (1) injectors, turn the ignition key to the ON position (ON).
Select the required item from the tester menu.
Crank the engine with the starter for more than 2 seconds and visually check that there is no fuel leakage from the connections.
Make sure that the fuel pressure is at least 1 MPa within 20 seconds after the starter has finished cranking the engine crankshaft.
If the fuel pressure is below 1 MPa, then this means that there are leaks in the high pressure line.
Turning the ignition key to the OFF position (OFF), connect the intermediate connector of the injectors.
Start the engine and let it idle.
Measure the fuel pressure while the engine is idling. The required value is 4.0-6.9 MPa.
Check that the fuel pressure at idle does not drop even after several pedal strokes.
If the fuel pressure does not meet the required limits, then troubleshoot and eliminate them in accordance with the table.
With the engine off, turn the ignition key to the OFF position (OFF).
Disconnect the tester.
| Symptom | Possible reasons | Remedy |
| Reduced fuel pressure | Fuel leaks into the fuel return line due to poor seating of the high pressure fuel regulator valve or weakening of its spring | Replace high pressure fuel pump |
| Fuel pressure drops after pressing the gas pedal | Reduced pressure generated by the high pressure fuel pump | Replace high pressure fuel pump |
| Increased fuel pressure | Stuck High Pressure Fuel Regulator Valve | Replace high pressure fuel pump |
| Clogged fuel return hose to fuel tank | Clean or replace fuel line |