Checking fuel pressure sender G247 — VW

Checking
fuel pressure sender
G247
Fuel pressure sender
G247
measures current pressure in high-pressure system and supplies engine control unit with a voltage signal.
Special tools and workshop equipment required
Fault reader
V.A.G 1551
with
LT diagnostic cable
V.A.G 1551/5B
Adapter
V.A.G 1598/30
Hand multimeter
V.A.G 1526C
or
multimeter
V.A.G 1715
Adapter set
V.A.G 1594C
Current flow diagram
Test prerequisites
All electrical consumers, e.g. lights and rear window heating must be switched off
Test sequence
Connect
fault reader
V.A.G 1551
and select engine electronics control unit with
“address word 01”
. Engine must be idling. (Connect fault reader and select engine electronics control unit
Chapter
.)
Indicated on display:
Rapid data transfer HELP
Select function XX
Press buttons
0
and
4
for function
“Initiate basic settings”
and confirm entry with
Q
button.
Indicated on display:
Basic setting HELP
Input display group number XXX
Press buttons 0, 2 and 2 for
“Display group number 22”
and confirm entry with
Q
button.
Indicated on display:
System in basic setting 22 ->
1400 rpm open 600 0.35 ms
Note display zone 2. Display must fluctuate every 10 seconds between
“open”
and
“closed”
.
Check fuel pressure in display zone 3.
Display in display zone 2
“open”
: Specification approx. 600 bar
Display in display zone 2
“closed”
: Specification approx. 300 bar
Check injection time in display zone 4.
Display in display zone 2
“open”
: Engine code AUH specification approx. 0.30...0.40 ms
Display in display zone 2
“open”
: Engine code BCQ specification approx. 0.30...0.45 ms
Display in display zone 2
“closed”
: Engine code AUH specification approx. 0.57...0.67 ms
Display in display zone 2
“closed”
: Engine code BCQ specification approx. 0.60...0.75 ms
If the specification is not attained:
Press the
→
button.
Press buttons
0
and
6
for function
“End data transfer”
and confirm entry with
Q
button.
Switch off ignition.
Pull 3-fold connector off fuel pressure sender
Chapter
.
Connect
adapter
V.A.G 1598/30
to control unit wiring harness. The engine control unit remains disconnected.
Check cables between test box and connector for open circuit using current flow diagram.
Contact 1 + socket 3/20
Contact 2 + socket 3/33
Contact 3 + socket 3/35
Wire resistance: Max. 1.5 Ω
Also check cables for short to one another, short to vehicle earth and short to battery positive. Specification: ∞ Ω
If no fault is detected in the wiring:
Renew the
fuel pressure sender
G247
.