Checking fuel gauge sender G - four-wheel drive vehicles — AUDI

Checking
fuel gauge sender
G
- four-wheel drive vehicles
Special tools and workshop equipment required
Hand-held multimeter
V.A.G 1526 E
Auxiliary measuring set
V.A.G 1594C
Removal wedge
3409
Procedure
Move front seats all the way forwards.
Switch off ignition.
TT Coupé:
Remove rear seat bench
General body repairs, interior
Rep. gr.
72
Rear seats; Removing and installing seat bench/individual seats
.
TT Roadster:
Remove back panel trim (right-side)
General body repairs, interior
Rep. gr.
70
Passenger compartment trim panels
.
Remove back panel (right-side)
Body Repairs
Rep. gr.
51
Inner side panel; Removing and installing back panel
.
All vehicles (continued):
Unclip cover
1
for flange (right-side) at retainers
arrows
using
removal wedge
3409
.
Release retainer catch and unplug electrical connector
2
on flange (right-side).
Note
Disregard
item 1
.
Fuel gauge sender
G
installed:
Note
To obtain an exact measurement of the resistance value for the specification
“Tank full”
, the fuel tank must be completely full. For this, drive for at least 500 metres after filling the tank to let air bubbles escape from the fuel tank; then add fuel again.
Connect multimeter (resistance test) as shown in table.
Measure at contacts
Tank empty
Tank full
1 + 3
297 … 303 Ω
78 … 80 Ω
1 + 5
37 … 45 Ω
254 … 262 Ω
3 + 5
1)
335 … 345 Ω
335 … 345 Ω
1)
Sender in any position
Fuel gauge sender
G
removed:
Note
In order to test the maximum and minimum resistance values for
“tank full”
and
“tank empty”
, remove the
fuel gauge sender
G
and move the float all the way to its top or bottom position.
The following values are obtained with the fuel gauge sender removed, due to the greater travel of the float arm:
Connect multimeter (resistance test) as shown in table.
Measure at contacts
Tank empty
Tank full
1 + 3
297 … 303 Ω
78 … 80 Ω
1 + 5
37 … 45 Ω
254 … 262 Ω
3 + 5
1)
335 … 345 Ω
335 … 345 Ω
1)
Sender in any position
Fuel gauge sender
G
is defective in the following cases:
Large differences in test readings
Reading: 0 Ω (short circuit)
Reading ∞ Ω (open circuit)
No fault in electrical wiring
Install fuel delivery unit/
fuel gauge sender
G
Chapter
.