Engine running fine
The relief valve fuel drain line must be installed on the fuel rail.
Start the engine.
Set the scan tool to parameter display mode.
Warm up the engine.
Read the value of the fuel temperature using parameter PR063 - Fuel temperature». If the temperature changes rapidly, wait for the fuel temperature to rise to 50'C. If the temperature displayed by the scan tool does not change or changes too slowly, drive for 15 minutes.
Stop the engine.
Install tool Mot. 1760 Put the scan tool in parameter display mode and check parameter PRQ38 «Pressure in the fuel distribution ramp». Have an assistant supervise the filling of the fuel tanks while the engine is running, as one of them may fill up faster than the others if there is a large leak from the corresponding injector.
Start the engine.
Increase the engine speed until the rail pressure reaches 550 bar. If the speed is below 3000 min-1, maintain this pressure. If the speed is above 3000 min-1, reduce it to a rail pressure of 500 bar and maintain this pressure. Maintain these conditions for 1 min.
Release the throttle control pedal and maintain idle speed for 10 seconds.
Stop the engine.
Measure the amount of fuel in 8 beakers. Replace the nozzle, which corresponds to the amount of fuel over 5 ml. Remove tool Mot. 1760 as indicated in the method of its removal.
Engine runs intermittently
Install tool Mot. 1760 as indicated in the method of its installation.
Click on the start button (on the card).
Measure the length of the fuel-filled pipe sections of tool Mot. 1760.
Replace the relief valve if the pipes are more than 10 cm full of fuel.