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Clean throttle valve control unitJ338 > < Checking the tightness of the injection valves

Fabia Mk2

Testing fuel injection rate
Testing fuel injection rate
Test conditions:
l  The fuel pressure must be OK, test → Chapter
l  Injection valves must be installed in the fuel rail and fuel line connected
l  Fuel temperature 15…20°C, fuel must be according to the valid standards
   
–  Insert injector to be tested in a measuring glass -V.A.G 1602-.
–  Remove cover from the fuse holder.
  S24-0340
–  Remove fuse for protection of fuel pump from the fuse carrier below the dash panel according to current flow diagrams → Current flow diagrams, Electrical fault finding and Fitting locations.
–  Connect the contact of the relevant fuse socket (de-energized) and the battery positive terminal (+) with cables from the measuring tool set. The fuel pump must run.
  S20-0290
–  Connect a contact of the injection valve on the engine mass using adapter cables from the mesuring tool set.
–  Connect the other contact of the injection valve with an auxiliary cable 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 battery positive (+).
  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 the test at the other injectors in sequence. To do so always use a new measuring glass.
–  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: 55...65 ml (per injection valve)
If the measurement obtained for one or several injectors is below or above the specification:
–  Replace the faulty injector → Chapter.
The injectors are installed in the reverse order for removal. Pay attention to the following:
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

Clean throttle valve control unitJ338 > < Checking the tightness of the injection valves