Genuine Audi TT Fuel Injector

Audi TT Fuel Injector Parts and Q&A

• Injector
  06A-906-031-BA
  Q: Should you always replace all Fuel Injector O-rings during installation and coat the new O-rings with clean engine oil for lubrication on Audi TT?

  A:

  Replace all fuel system O-rings whenever you make a installation and coat the new O-rings in fresh engine oil to lubricate. Remove battery ground strap from battery negative terminal. Take off the engine cover. To remove the fuel supply line and return line, press in on the securing ring to release them from the connection. The fuel supply line is marked by white and the fuel return line is marked blue. Detach the vacuum tube from the fuel pressure regulator. Unplug the fuel injector harness connectors from the fuel rail and unclip the support bar. Move the fuel injector harness out of the way. Remove the fuel rail mounting bolts and pull the rail and injectors from the top, evenly off the intake manifold and set the assembly down on a clean cloth. Detach the retaining clips and injectors from the fuel rail. Reinstall the fuel injectors and fuel rail in the reverse order of removal. Replace all O-rings. Do not remove the plastic cap from the fuel injector head when replacing the lower O-ring. Lubricate new O-rings with clean engine oil. Ensure that the injectors are installed and seated correctly. Ensure that the injector retaining clips are properly seated. Position the fuel rail with injectors against the intake manifold and press into place evenly. Finally, tighten the fuel rail mounting bolts to specification.
• Injector
  06A-906-031-BC
  Q: How to test a Fuel Injector for resistance, voltage supply, and activation on Audi TT?

  A:

  Detach the fuel injector harness connector and connect a multimeter for the resistance measurement across the two terminals of the fuel injector. If you don't get the specified value, then replace the fuel injector. By connecting an LED voltage tester between the fuel injector harness connector lead #1 and ground, and then operating the starter for a brief moment (the engine can also start), test for voltage supply at the fuel injector; the LED of the voltage tester must blink. If the LED is not lit, check the wiring for any open or short using the wiring diagrams. Subsequently, check for activation of the injector by refitting the fuel injector harness connector and sliding back the rubber connector cover. Connect an LED voltage tester between the two terminals in the fuel injector harness connector. Then, briefly operate the starter and confirm the LED of the voltage tester blinks. Note that LED voltage testers do not go out completely between activations by the ECM. However, LED voltage testers do continue to glow and become slightly brighter during activation. If the LED doesn't illuminate, check the wiring diagrams for open or short circuits.