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Engine control unit > < Charge air system with turbocharger

Leon Mk1

Checking injectors
Checking injectors
Check injectors for leaks and quantity injected
   
Special tools and workshop equipment required
t  Remote control -V.A.G 1348/3-
t  Adapter -V.A.G 1348/3-2-
t  Calibration tester -V.A.G 1602-

Test conditions
l  The fuel pressure must be in order, checking → Chapter.
  Warning
Fuel system is under pressure! Therefore remove fuse 7 and place a cloth around the connection before opening the system. Then release the pressure by loosening the connection carefully.
Test sequence
   
–  Pull connectors off injectors.
–  Then remove fuel rail complete (without disconnecting the fuel lines).
  Note!
Before loosening the fuel rail securing bolts, take the stiff metal fuel line (from the activated charcoal filter) out of the retainer.
–  Pull off vacuum hose from fuel pressure regulator.
–  Lift fuel rail with injectors off intake manifold and support it.
Checking for leaks
–  Connect positive measuring probe (red sleeve) from -V.A.G 1348/3- to battery positive (+).
–  Remove cover below steering wheel and pull out fuel pump relay (position 8).
–  Insert end of adapter cable -V.A.G 1348/3-2- into contact 2 of relay socket and connect the other end to the remote control -V.A.G 1348/3-.
  Note!
This step serves only to run the fuel pump when the engine is stopped.
–  Check injector for leaks (visual check). Only 1 to 2 drops per minute must emit from each valve when fuel pump is running.
If the fuel loss is greater:
–  Switch off ignition and renew leaking injector.
  Note!
Always renew seals.
Checking injected quantity
–  Insert injector to be checked in a measuring glass of tester for injected quantity -V.A.G 1602-.
  E24-0096
–  Connect one contact of the injector to be tested to engine earth using auxiliary cables from -V.A.G 1594C-.
–  Connect the second injector contact with auxiliary cable to remote control -V.A.G 1348/3- using adapter cable -V.A.G 1348/3-2-.
–  Connect crocodile clip to battery (+).
–  Initiate final control diagnosis → Diagnostics operations unitVAS 5051, die the fuel pump must run.
–  Operate remote control -V.A.G 1348/3- for 30 seconds.
–  Repeat check on the other injectors. To do this use new measuring beakers.
–  After all injectors have been activated, place the measuring glasses on a horizontal surface and compare the injected quantity. Specification: 133...157 ml per injector
If the measured values of one or more injectors are above or below the prescribed specifications:
–  Renew defective injector.
Perform installation of injectors in reverse order. When doing this note the following:
t  Renew O-rings on all injectors and lightly moisten with clean engine oil.
t  Insert injectors vertically and in the correct position into the fuel rail and secure with retaining clips.
t  Fit fuel rail with secured injectors onto intake manifold and press in evenly.
  A24-0079

Engine control unit > < Charge air system with turbocharger