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Skoda Fabia Workshop Service and Repair Manuals

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Testing intake manifold preheating > < Testing components

Inspecting injector tightness, rate, and jet formation for Fabia Mk2 12/47 kW; 12/51 kW Engine

Inspecting the injection rate, tightness and jet formation of the injectors
Inspecting the injection rate, tightness and jet formation of the injectors
Special tools and workshop equipment required
t  Remote control, e.g. -V.A.G 1348/3A-
t  Adapter, e.g. -V.A.G 1348/3-2-
t  Digital potentiometer, e.g. -V.A.G 1630-
t  Measuring tool set, e.g. -V.A.G 1594 A, B oder C-
t  Hand multimeter, e.g. -V.A.G 1602-
Test condition
l  Fuel pump relay o.k., test → Vehicle diagnosis, testing and information system VAS 5051
l  Fuel pump o.k., test → Chapter
l  Fuel temperature 15…20°C, fuel must be according to the valid standards
Test sequence
–  If necessary remove engine cover with air filter → Chapter.
–  Remove fuel rail together with installed injectors → Chapter. The fuel hoses remain connected.
Testing jet formation and tightness
–  Disconnect plug at coolant temperature sender -G62- → Chapter.
   
–  Connect the digital potentiometer with auxiliary lines on both contacts of the plug connection and set to the connected side 15 kΩ.
  S24-0342
–  Hold a small vessel under the injection valve to be tested and disconnect the plug from the other injection valves.
–  Operate the starter (a second person is needed here). The injection valve must emit a pulsed jet of fuel.
–  Repeat test at the other injectors. Always check that it is only the checked valve which is connected up.
–  Then check the injection valves for tightness. No more than 2 drops/min may trickle out.
If the fuel loss is greater than this:
–  Switch off ignition.
–  Replace the faulty injector → Chapter.
Testing fuel injected quantity
  Note
When testing the injection rate also check the jet formation. The jet must be the same for all valves.
–  Insert injector to be tested in a measuring glass.
  S24-0498
–  Connect one contact of injector to battery mass.
–  Connect the second contact of the injector to the remote control.
–  Connect terminal to battery positive (+).
  S24-0579
–  Connect battery positive (+) and fuse socket No. 30 with adapter cable and adapter -V.A.G 1348/3-2-.
The fuel pump unit must start.
–  Operate remote control for 30 seconds.
–  Repeat test at the other injectors. Always use a new measuring glass.
–  Once all the injectors have been driven, position the graduated measuring glasses on an even base.
–  Switch off voltage supply of fuel delivery unit.
–  Compare the individual quantities of fuel injected.
Specified value: 84...91 ml per valve.
If the measurement obtained for one or several injectors is not within the specification:
–  Replace the faulty injector → Chapter.
Installation of the injector occurs in reverse order. Pay attention to the following:
t  Replace the O-rings and all the injectors and moisten lightly with clean engine oil.
t  Insert injectors vertically and into the correct position in the fuel rail and secure with retaining clips.
t  Fit fuel rail with secured injectors onto the cylinder head and screw up at the same time → Chapter.
  S20-0290

Testing intake manifold preheating > < Testing components