Checking fuel pump G23 (right-side) - electrical test — AUDI

Checking
fuel pump
G23
(right-side) - electrical test
Special tools and workshop equipment required
Remote control for V.A.G 1348
V.A.G 1348/3A
Hand-held multimeter
V.A.G 1526 E
Auxiliary measuring set
V.A.G 1594C
Test instrument box
VAS 6356
with
trigger clamp, 100 A
VAS 6356/4A
Procedure
Observe test conditions
Chapter
.
Checking voltage supply
Use screwdriver to pry off cover (right-side) at dash panel
arrow
.
Take fuse 31 out of fuse holder SC31 (right side of dash panel, middle row, 1st large fuse from the top).
Connect
remote control
V.A.G 1348/3A
for V.A.G 1348 with
adapter cable
V.A.G 1348/3-2
to left-hand fuse socket terminal of fuse SC31.
Connect crocodile clip of
remote control
V.A.G 1348/3A
for V.A.G 1348 to battery
“+”
(positive).
Press remote control button.
Fuel pump should start running (noise is audible in vicinity of fuel tank).
Note
The fuel pump runs very quietly. Avoid background noise whilst checking fuel pump. Have second mechanic perform check if necessary.
If no noise can be heard from pump:
Remove luggage compartment floor covering.
Unscrew cover for flange (right-side)
arrows
.
Unplug electrical connector
2
on flange (right-side).
Note
Disregard
item 1
.
Connect multimeter between contacts
1
and
4
of electrical connector to measure voltage.
Press remote control button.
Specification: approx. battery voltage
If specification is not obtained:
Repair wiring harness according to current flow diagram.
If reading matches specification although no noise can be heard from pump:
Remove fuel delivery unit (right-side)
Chapter
.
Check that the electrical wires between flange and fuel pump are connected and test for continuity.
If no faults are found in the wiring:
Fuel pump is defective. Renew the fuel delivery unit (right-side)
Chapter
.
Install fuel delivery unit (right-side)
Anchor
.
Checking current draw
Fuel pump voltage supply OK
Anchor
Take fuse 31 out of fuse holder SC31 (right side of dash panel, middle row, 1st large fuse from the top).
Connect
remote control
V.A.G 1348/3A
for V.A.G 1348 with
adapter cable
V.A.G 1348/3-2
to left-hand fuse socket terminal of fuse SC31.
Connect crocodile clip of
remote control
V.A.G 1348/3A
for V.A.G 1348 to battery
“+”
(positive).
Connect
test instrument box
VAS 6356
with
trigger clamp, 100 A
VAS 6356/4A
to cable of remote control.
Press remote control button.
Measure current draw of fuel pump.
Specification: approx. 8 A.
If specification is not obtained:
Note
A current draw of 4 A indicates that the fuel pump is running dry.
Readout
Cause of fault
Remedy
approx. 4 A
Fuel tank empty
Fill tank
Housing of fuel delivery unit leaking
Renew fuel delivery unit
Chapter
0 A
Fuel pump
G23
defective
Renew fuel delivery unit
Chapter