Checking current consumption of fuel system pressurisation pump G6 — VW

Checking current consumption of
fuel system pressurisation pump
G6
Special tools and workshop equipment required
Vehicle diagnostic tester
Hand-held multimeter
V.A.G 1526D
or
pickup clamp
V.A.G 1526B/2
Test instrument adapter/DSO (5-pin)
VAS 5565
Vehicle diagnostic tester
Note
The battery voltage and the diesel fuel temperature have a great influence on the current draw of the fuel pump. Therefore, ensure that battery voltage is at least 12.5 V during the check.
The vehicle must be fuelled with the diesel fuel appropriate for the time of the year. The fuel sold in summer is filterable up to 0° C; that sold in transition time (spring and autumn) is filterable up to -10° C and that sold in winter is filterable up to -20° C. Summer fuel may coagulate (flock) in very low winter temperatures. If you are unsure, try and expose it to the low outside temperature for approximately 1 hour. If the fuel coagulates at temperatures down to -20°C, it is unsuitable for low temperatures. This coagulation can block the strainer in the fuel delivery unit as well as the fuel filter.
Test prerequisites
Connect battery charger to ensure sufficient voltage supply of min. 12.5 V.
Diesel fuel temperature above 10 °C
Test procedure
Fold rear seat bench up
General body repairs, interior
Rep. gr.
72
Rear seat; Removing and installing bench seat / individual seats
.
Raise cover of fuel delivery unit.
First check that connector
arrow
is fitted securely by pulling connector without pressing catch. The connector can cause a fault if it has not been fitted correctly.
Pull off connector
4
.
Connect
test instrument adapter/DSO (5-pin)
VAS 5565
to connector and fuel delivery unit.
Connect
pick-up clamp
V.A.G 1526B/2
A
to red terminal with lettering
“pick-up clamp”
for
test instrument adapter/DSO (5-pin)
VAS 5565
.
Note
Pickup clamp of
hand-held multimeter
V.A.G 1715
can also be connected to red terminal with lettering
“pickup clamp”
of
test instrument adapter/DSO (5-pin)
VAS 5565
.
Switch ignition on.
Connect
vehicle diagnostics tester
and then carry out Guided Fault Finding
“Checking electrical fuel pump(s)”
.
Note
The fuel pump is now activated for 30 seconds.
Read current consumption on
hand-held multimeter
V.A.G 1526D
: specification: max. 14.0 amperes.
If the measured value is not within specifications:
Remove fuel delivery unit
Chapter
.
Check electrical wiring between flange and fuel pump for continuity.
Check filter in floor of fuel delivery unit for dirt or clogging.
If no open circuit or dirt is found:
Renew fuel delivery unit
Chapter