Checking fuel system pressurisation pump G6 (left-side) - electrical test — AUDI

Checking
fuel system pressurisation pump
G6
(left-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
Remove luggage compartment side trim cover (right-side)
arrows
.
Vehicles built in model year 2003:
Take fuse 10 out of fuse holder SF10 (located in relay and fuse carrier in luggage compartment (right-side), position 10).
Vehicles from model year 2004 onwards:
Take fuse 2 out of fuse holder SF2 (located in relay and fuse carrier in luggage compartment (right-side), position 2).
All vehicles (continued):
Connect
remote control
V.A.G 1348/3A
for V.A.G 1348 with
adapter cable
V.A.G 1348/3-2
to right-hand terminal of fuse socket from which fuse has been taken out.
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.
Detach cover for flange (left-side)
arrows
.
Unplug electrical connector
2
on flange (left-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 the fuel delivery unit (left-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 (left-side).
Install fuel delivery unit (left-side)
Anchor
.
Checking current draw
Fuel pump voltage supply OK
Anchor
Remove luggage compartment side trim cover (right-side)
arrows
.
Vehicles built in model year 2003:
Take fuse 10 out of fuse holder SF10 (located in relay and fuse carrier in luggage compartment (right-side), position 10).
Vehicles from model year 2004 onwards:
Take fuse 2 out of fuse holder SF2 (located in relay and fuse carrier in luggage compartment (right-side), position 2).
All vehicles (continued):
Connect
remote control
V.A.G 1348/3A
for V.A.G 1348 with
adapter cable
V.A.G 1348/3-2
to right-hand terminal of fuse socket from which fuse has been taken out.
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 system pressurisation pump
G6
defective
Renew fuel delivery unit
Chapter