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4.5 - 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.
◆ Dash panel insert faults may also be displayed, as the immobilizer is an integral part of the dash panel insert.
◆ 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.
Attention:
As an additional step on completion of repair work, fault memory of engine control unit is to be read out sepa‐
rately and entry "Engine control unit blocked" erased. Check other faults stored and eliminate if necessary.
Display on VAS 5051 Possible cause of trouble Fault remedy
01128
Immobilizer reading spool -D2 - Connector not attached or fault in
reader coil and wiring
- Check connector and reader coil as
well as wiring (visual inspection) and
replace reader coil if necessary
=> Electrical System; Repair Group 96
- Immobilizer control unit (integrated
into dash panel insert) defective
- Erase fault memory => Page 119 ,
interrogate again and replace dash
panel insert if necessary
=> Electrical System; Repair Group 90
Display on VAS 5051 Possible cause of trouble Fault remedy
01176
Key
Signal too low - Reader coil or wire defective (contact re‐
sistance/loose contact)
- Check reader coil as well as wiring and
connector (visual inspection) and replace
reader coil if necessary
=> Electrical System; Repair Group 96
- No electronics in ignition key (transpond‐
er) or not functioning
- Replace ignition key, re-match all ignition
keys and check operation => Page 124
Not authorised - Mechanically suitable ignition key not
matched
- Re-match all ignition keys and check op‐
eration => Page 124
Display on VAS 5051 Possible cause of trouble Fault remedy
01177
Engine control unit
Not authorised - Engine control unit not adapted - Adapt engine control unit
=>Page 131
- Open circuit in wiring or short cir‐
cuit at W-wire
- Use current flow diagram to perform fault-
finding
01179
Audi A3 1997 ➤
Electrical system Self-diagnosis - Edition 02.2002
118 01 - Self-diagnosis
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