Checking speedometer sender G22 — VW

Checking
speedometer sender
G22
Special tools and workshop equipment required
Fault reader
V.A.G 1551
or
vehicle system tester
V.A.G 1552
with
diagnosis cable
V.A.G 1551/3
Adapter cable (68-pin)
V.A.G 1598/18A
or
adapter
V.A.G 1598/22
Hand multimeter
V.A.G 1526C
or
multimeter
V.A.G 1715
Voltage tester
V.A.G 1527B
Auxiliary measuring set
V.A.G 1594C
Current flow diagram
Test prerequisite
Speedometer OK., checking
Electrical System
Rep. Gr.
90
Note
To check the speed signal the vehicle must be driven. To do this a second person is necessary.
WARNING
Secure fault reader to rear seat and operate from this position.
Test procedure
Connect
fault reader
V.A.G 1551
or
vehicle system tester
V.A.G 1552
and select engine electronics control unit with
“address word 01”
. Engine must be idling. (Connect
fault reader
V.A.G 1551
and select engine electronics control unit
Chapter
.)
Indicated on display:
Rapid data transfer HELP
Select function XX
Press buttons
0
and
8
for function
“Read measured value block”
and confirm entry with
Q
button.
Indicated on display:
Read measured value block HELP
Input display group number XXX
Press buttons
0
,
0
and
6
for
“Display group number 6”
and confirm entry with
Q
button.
Carry out a road test and compare display with speedometer (2nd person required).
Specification display zone 1: Approx. road speed.
Read measured value block 6 ->
0 km/h 0 0 0 000000 255
Press
→
button.
Press buttonss
0
and
6
for function
“End output”
and confirm entry with
Q
button.
If no speed is indicated:
Engine code AGD (with 68-pin control unit)
Connect
adapter cable, 68-pin
V.A.G 1598/18A
to control unit wiring harness.
Bridge sockets 1+42 with auxiliary lines from
V.A.G 1594
.
Set voltage measuring range on
hand-held multimeter
V.A.G 1526C
or
multimeter
V.A.G 1715
and connect between sockets 43 + 33 of
adapter cable (68-pin)
V.A.G 1598/18A
.
Switch on ignition.
Raise and rotate left front wheel.
Specification:
Between 0 and 5 volt fluctuating
Note
If necessary, hold the front right wheel to prevent it from turning.
If the display does not fluctuate:
Check lines to speedometer/speedometer sender
Current flow diagrams, Electrical fault finding and Fitting locations
Engine codes AGD (with 80-pin control unit), AHG, AKU
Connect
adapter
V.A.G 1598/22
to control unit wiring harness.
Connect
voltage tester
V.A.G 1527B
between socket 1 (ground) and socket 51 (speed signal).
Switch on the ignition and turn the front left wheel by hand.
Note
If necessary, hold the front right wheel to prevent it from turning.
The
voltage tester
V.A.G 1527B
must flash (approx. four times per wheel rotation).
If the
voltage tester
V.A.G 1527B
does not flash, check line connection from engine control unit connector contact 51 to dash panel insert for open/short circuit.
Current flow diagrams, Electrical fault finding and Fitting locations