seat Workshop Repair Guides

SEAT Workshop Service and Repair Manuals

ABOUT US
Fuel flow: check > < Injection quantity and injector seal of the injection valve: check

Leon Mk2

Injection valves: Checking for leaks
Injection valves: Checking for leaks
  WARNING
Fuel supply line is pressurised. Wear safety goggles and appropriate clothing to avoid injury and contact with skin. Before loosening hose connections, wrap a cloth around the connection. Then eliminate the pressure by carefully separating the pipe.
l  Fuel pressure must be correct, check → Chapter.
–  Remove intake manifold lower section → Chapter.
–  Pull all connectors off injectors.
   
–  Remove the fuel distributor from the intake manifold together with the injectors and put them down on a clean cloth.
The fuel line remains connected on the fuel rail.
–  Remove the rear right seat → Rep. gr.72.
  A24-0335
–  Remove cover from fuel delivery unit.
  A20-1206
–  First check if the connector -arrow- has been inserted correctly; pull on the connector without pressing the locking mechanism. Malfunctions may arise when the connector has not been inserted correctly.
–  Extract the connector -arrow- from the fuel delivery unit.
–  Check the contact on the plug connector and the fuel supply unit for damage.
  N20-10623
–  Connect the adapter for the DSO measuring/oscilloscope module (5 contacts) -VAS 5565-to the connector in the fuel supply unit.
–  Connect the remote control for V.A.G 1348 -V.A.G 1348/3A- to the measurement adapter / DSO (5 poles) -VAS 5565- and to battery positive (+).
  Note
The following operation is to make the fuel pump run when the engine is stopped.
–  Operate the Remote control -V.A.G 1348/3A- and check the tightness of the injector (visual inspection). Only 1 to 2 drops per minute may emit from each valve when fuel pump is running.
If the fuel loss is greater:
–  Replace the defective injector → Chapter.
  Note
t  When replacing the injectors, erase the self adapting values and re-adapt to the engine control unit → Vehicle diagnostic, testing and information system VAS 5051„Guided functions“.
t  Always renew seals.
  N20-10422

Fuel flow: check > < Injection quantity and injector seal of the injection valve: check