Audi Workshop Service and Repair Manuals > A4 Mk3 > Power unit | Fuel supply system, diesel engines | Fuel supply, gas operation | Fuel delivery unit and fuel gauge senders - vehicles with four-wheel drive

Checking fuel gauge sender 2G169

Checking fuel gauge sender 2 -G169-

Special tools and workshop equipment required

t	Hand-held multimeter -V.A.G 1526E-

t	Auxiliary measuring set -V.A.G 1594C-

Procedure

Note

The electrical wiring for the fuel gauge sender 2 -G169- is routed to the fuel pump flange along the inside of the fuel tank.

–	Remove rear seat bench → Rep. gr.72.

–	Unscrew cover for flange -arrows-.

–	Unplug electrical connectors -1- and -2- on flange.

Note

Disregard -item 3-.

–	Connect multimeter (resistance test) between contact -2- on connector -A- and contact -2- on connector -B-.

With fuel gauge sender 2 -G169- installed:

l	Sender at lower stop: approx. 290 Ω.

l	Sender at upper stop: approx. 45 Ω.

Note

t	If the resistance is 0 Ω, there is a short circuit. If the resistance is ∞ Ω, there is an open circuit in the wiring.

t	In order to test the maximum and minimum values for „tank full“ and „tank empty“, remove the fuel gauge sender 2 -G169- → Chapter and move the float all the way to its top or bottom position.

t	The following values are obtained with the fuel gauge sender removed, due to the greater travel of the float arm:

With fuel gauge sender 2 -G169- removed:

l	Sender at lower stop: approx. 290 Ω.

l	Sender at upper stop: approx. 16 Ω.

–	Connect multimeter (resistance test) between contacts -1- and -2- on connector -A-.

With fuel gauge sender 2 -G169- installed or removed:

l	Sender in any position: approx. 340 Ω.

Installation is carried out in the reverse order; note the following:

–	Install cover for flange → Fig..

–	Install rear seat bench → Rep. gr.72.

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