Checking signal from speedometer sender G22 — AUDI

Checking signal from
speedometer sender
G22
If there is a fault in the speed display on the speedometer, check whether the signal is present at the speedometer.
Special tools and workshop equipment required
Hand-held multimeter
V.A.G 1526C
Auxiliary measuring set
V.A.G 1594C
Test box
V.A.G 1598A
Adapter
V.A.G 1598/25
Vehicle diagnostic, testing and information system
VAS 5051B
with
diagnostic lead
VAS 5051/5A
Procedure
WARNING
To avoid any risk of accidents when using test equipment while test-driving the vehicle, the test equipment must always be secured on the rear seat and operated from there by a second person.
If test equipment is operated from the front passenger's seat, the occupant could suffer injury in the event of an accident if the front passenger's airbag is triggered.
Vehicle diagnostic, testing and information system
VAS 5051B
with
diagnosis lead
VAS 5051/5A
connected,
vehicle self-diagnosis
and vehicle system
“17 - instrument cluster”
selected
Electrical system, self-diagnosis
Rep. Gr.
01
.
Display on
VAS 5051
:
Select function
“08 - Reading measured value block”
from list
1
.
Display on
VAS 5051
:
Use keypad
2
to enter
1
for
“display group 001”
and confirm by touching
Q
key.
1
Enter display group
Test-drive vehicle.
Display on
VAS 5051
:
Check readout in display zone
1
.
Specification: current vehicle speed must be displayed (compare to
speedometer
G21
).
If speed is indicated, but not displayed on
speedometer
G21
:
Renew instrument cluster
Chapter
.
If speed is not displayed:
Remove instrument cluster
Chapter
.
Connect
test box
V.A.G 1598A
with
adapter
V.A.G 1598/25
to multi-pin connector, 32-pin, blue.
Connect hand-held multimeter to test continuity between sockets
“28”
and
“9”
.
Raise vehicle with a lifting platform until front left wheel is free to turn.
Rotate front left wheel.
The continuity tester of the hand-held multimeter must emit brief high-pitched signals.
If continuity tester does not react as described:
Check wiring connection between instrument cluster and
speedometer sender
G22
according to current flow diagram.
If no fault is found in wiring:
Renew
speedometer sender
G22
.