Audi Workshop Service and Repair Manuals

The needle lift sender signal is required for determining the start of injection. In the event of failure, the start of injection is subject to open-loop control (as a function of engine speed and load), whereas in normal operation it is subject to closed-loop control (governed by engine speed, load and temperature).

Electrical testing of needle lift sender -G80

• ‒ Detach sender connector => Overview of fitting locations, Page 23-3.
• ‒ → Use hand-held multimeter V.A.G 1526 to measure resistance between connector contacts.

• Desired value: 90...120 ω (when the engine is hot the resistance may be up to 20 ω higher)

• ‒ If desired value is not attained, replace cylinder 3 injector with needle lift sender -G80.

Testing cable connections to needle lift sender -G80

• ‒ Detach sender connector => Overview of fitting locations, Page 23-3.
• ‒ Connect up test box

Check following cable connections for short circuit to positive/negative and breaks.

• ‒ If applicable, eliminate cable break/short circuit.