Fault Table - Audi A8 1994 Service Manual

5.5 - Fault table

Notes:
◆ Faults occurring in monitored sensors or components are stored in fault memory together with an indication
of the type of fault.
◆ The fault table is arranged according to the 5-digit fault codes on the left.
◆ All static and sporadic faults are stored in the fault memory:
A fault is recognised as being static if it is present for at least 2 seconds. If a fault is then no longer present,
it is stored as being sporadic and "sporadic" also appears on display.
◆ After switching on ignition, all faults present are set to sporadic and only stored as being static if they are
still present after checking.
◆ Sporadic faults are erased if they do not re-occur in the course of 50 driving cycles (ignition on for at least
5 minutes, vehicle speed greater than 30 km/h).
◆ Do not immediately replace components indicated as being defective by VAS 5051, but rather: Start by
checking wiring and connectors to these components in line with current flow diagram. Also use current flow
diagram to check earth connections. This is particularly important if faults are output as being "sporadic".
◆ On completion of repair work, fault memory is to be interrogated again and erased.
Readout on VAS 5051 Possible cause of trouble
00532
Supply voltage
- Signal too low
00625
Vehicle speed signal
- Implausible signal
Readout on VAS 5051
00774
Rear left vehicle level sender
-G76
- Short to positive
- Open circuit/short to earth
00776
Front left vehicle level sender
-G78
- Short to positive
- Open circuit/short to earth
Electrical system Self-diagnosis 02.99 ➤ - Edition 05.2002
- Open circuit in wiring or short in power
supply
- Open circuit in wiring or short between
ABS control unit -J104 and headlight
range control unit -J431
- ABS control unit -J104 defective
Possible cause of trouble
- Open circuit in wiring or short be‐
tween sender -G76 and control unit
- Sender -G76 defective
- Open circuit in wiring or short be‐
tween sender -G78 and control unit
Remedy
- Use current flow diagram to perform fault-
finding
=> Current Flow Diagrams, Electrical Fault-
finding and Fitting Locations binder
- Use current flow diagram to perform fault-
finding
=> Current Flow Diagrams, Electrical Fault-
finding and Fitting Locations binder
- Replace ABS control unit -J104
=> Brake System; Repair Group 45
Remedy
- Use current flow diagram to perform
fault-finding
=> Current Flow Diagrams, Electrical
Fault-finding and Fitting Locations bind‐
er
- Replace sender -G76
=> Running Gear, Front-wheel Drive
and Four-wheel Drive; Repair Group 42;
Rear axle component layout Rear axle
component layout
- Use current flow diagram to perform
fault-finding
=> Current Flow Diagrams, Electrical
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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Fault-finding and Fitting Locations bind‐
with respect to the correctness of information in this document. Copyright by AUDI AG.
er
Audi A8 1994 ➤
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5.5 - Fault table