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Engine control unit > < Leak check

Octavia Mk2

Testing injection rate
Testing injection rate
Test conditions:
l  The fuel pressure must be OK, test → Chapter
l  Injection valves installed in the fuel rail and fuel line connected
l  Fuel temperature 15...20°C, fuel must according to the valid standards
–  Remove air filter housing:
t  Engine identification characters BCA → Chapter
t  Engine identification characters BUD, CGGA → Chapter
   
–  Disconnect plug -arrows- of all injection valves.
–  Release the wiring loom of the injection valves.
–  Unscrew the fuel distributor from the intake manifold.
–  Remove the fuel distributor with injectors from the inlet manifold. (Hose remains connected).
–  Removing rear seat bench → Body Work; Rep. gr.72.
–  Remove the cover from the fuel delivery unit.
  S15-0348
–  Disconnect the plug connection -arrow- from the fuel delivery unit.
  N20-10623
–  Connect the adapter for measuring method/DSO (5-pin) -VAS 5565- to the plug and to the fuel delivery unit.
–  Connect the remote control -V.A.G 1348/3A- to the adapter -VAS 5565- and to the battery positive (+).
  Note
This step is only intended to ensure that the fuel delivery unit runs when the engine is switched off.
–  Insert injector to be tested in a measuring glass, e.g. -V.A.G 1602-.
  N20-10422
–  Connect a contact of the injection valve on the engine mass using adapter cables from the mesuring tool set.
–  Connect the second contact of the injection valve using adapter cables to the remote control -V.A.G 1348/3 A- with the adapter cable e.g. -V.A.G 1348/3-2-.
–  Connect alligator clip to the battery (+).
  Note
When testing the injection rate also check the jet formation.
–  Activate the remote control -V.A.G 1348/3 A- for 30 seconds.
–  Repeat test at the other injectors. While doing so use a new measuring glasses.
–  After all the injectors have been operated, place the measuring glasses on a flat surface and compare the quantities of fuel injected.
  Note
The jet must be the same for all injection valves.
Specified value: 56 ... 65 ml per valve.
If the measurement obtained for one or several injectors is below or above the specification:
–  Replace the faulty injector → Chapter.
The installation of the injection valves occurs in reverse order, while doing so pay attention to the following points:
t  Replace the O-rings on all the injectors and moisten lightly with clean engine oil.
t  Fit the fuel rail with the installed injection valves to the intake manifold and tighten screws uniformly to 7 Nm.
  S24-0579

Engine control unit > < Leak check