instrument cluster AUDI A8 1998 D2 / 1.G AHA Engine Auxiliary Signals Checking Workshop Manual

Read safety precautions for test driving vehicles
while using test equipment page 24
-9 .

The speed signal is generated by the vehicle
speed sensor (at the transmission), and
processed at the speedometer/odometer in the
instrument cluster.
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24-171

Continuation
If no speed was indicated:

Notes:
If the LED does not blink:
If the wiring is OK and the LED does not blink:
Repair Manual, Electrical Equipment, Repair Group 90
- Connect VAG1598/22 test box to ECM harness connector page 01
-
67
.
- Connect VAG1527B LED voltage tester between ECM/test box sockets
3 (B+) and 20 (signal).
- Lift vehicle at left-front until wheel is free.
- Switch ignition on and rotate left-front wheel by hand.
LED must blink (very brief blink)
The right-front wheel must not rotate; block it if necessary.For LEDs with little voltage consumption, the LED lights up at half
strength when the ignition is switched on.
- Check wiring from ECM connector, terminal 20 to instrument cluster for
open circuit or short circuit Electrical Wiring Diagrams,
Troubleshooting & Component Locations binder.
-
Check readiness code page 01
-70
. If Diagnostic Trouble Code
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24-177

- Conduct a test drive ( Safety precautions
page 24
-9 ).

- Check DTC memory of ECM page 01
-16
.
If only the DTC "Fuel level too low" (SAE P1250 /
VAG 17658) is stored in the DTC memory.

Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder - Connect VAG1598/22 test box to ECM harness connector page 01
-
67
.
- Check wire from terminal 21 of test box to instrument cluster for open
circuit or short circuit per wiring diagram.
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