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Fuel pressure control and retention pressure: checking > < Checking components

Leon Mk2

Injector seal and injection quantity: checking
Injector seal and injection quantity: checking
t  Check the seal → Anchor
t  Fuel flow: checking → Anchor
Consult the equivalence table for tools and equipment according to applicability between Seat / VW / Audi / Skoda → Chapter.
   
Special tools and workshop equipment required
t  Adaptor cable -SAT 1348/3-3-, see equivalent → Anchor
t  Torque wrench kit -SAT 8010-, see equivalent → Anchor
t  Remote control -VAG 1348/3A-, see equivalent → Anchor
t  Auxiliary cable kit -VAG 1594C-, see equivalent → Anchor
t  Injection quantity measurer -VAG 1602-, see equivalent → Anchor

Check the seal
  WARNING
Fuel system is under pressure! Wear safety gloves and goggles to avoid injury and contact with skin. Before opening the system place a cloth around the connection. Then release pressure by carefully pulling fuel hose from connection.
Test requirements
l  The fuel pressure must be in order, checking → Chapter.
–  Remove air filter housing.
–  Remove the upper part of the intake manifold → Chapter.
–  Disconnect the electrical connections from the injectors.
–  Unclip the cable harness from the injectors.
–  Remove the fuel rail from the lower intake manifold.
–  Remove the fuel rail together with the injectors from the lower intake manifold. (The fuel pipes remain connected).
–  Remove cover from fuse holder.
   
–  Remove fuse F34 for the fuel pump in the fuse holder. Fuse allocation → Current flow diagrams, Electrical fault finding and Fitting locations
–  Connect remote control -VAG 1348/3A- with adapter cable -SAT 1348/3-3- to lower contact to fuel pump and battery positive (+).
  Note
This step is only to ensure the fuel pump is running when the engine is stopped.
–  Place a small container below the injector to be checked.
–  Operate the remote control -VAG 1348/3A- for one minute
–  Checking injectors for leakage (visual check). 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
Always renew seals.
Fuel flow: checking
Check conditions:
l  The fuel pressure must be in order, checking → Chapter.
l  Injectors are installed in the fuel rail and the fuel line is connected.
–  Insert an injector that is to be checked into a graduated glass injection quantity measurer -VAG 1602-.
  E20-10032
–  Connect a contact from the injector to be checked to the engine grounding, using the auxiliary cables from the auxiliary cable kit -VAG 1594C-.
–  Connect a second injector contact to the remote control -VAG 1348/3A- using adapter cable -SAT 1348/3-3-.
–  Connect a clip to battery (+) in the engine compartment.
  Note
Use one test tube for each injector.
–  Insert an injector that is to be checked into a graduated glass of the injection quantity measurer -VAG 1602-.
–  Remove cover from fuse holder.
  E24-10049
–  Remove fuse F34 for the fuel pump in the fuse holder. Fuse allocation → Current flow diagrams, Electrical fault finding and Fitting locations
–  Join lower contact of fuse 34 for the fuel pump to battery positive (+) using adapter leads from adapter lead kit -VAG 1594C-.
–  Activate remote control -VAG 1348/3A- for 30 seconds.
–  Repeat check on other injectors. To do this use new measuring glasses.
–  After all injectors have been activated, place the measuring glasses on a horizontal surface and compare the injected quantity. Specification: 85 - 105 ml per injector.
When checking the injection quantity, also check the spray pattern. The spray pattern should be the same for all the injectors.
If the measured values of one or more injectors lie above or below the prescribed specifications:
–  Replace the defective injector → Chapter.
  E20-10033

Fuel pressure control and retention pressure: checking > < Checking components