Skoda OCTAVIA 2004 Workshop Manual page 27

OCTAV1A
Readout on V.A.G 1552
Fault number
old new
17978
Engine control
unit blocked
For vehicles
08.97 ä
18034
Data bus drive
Missing mes-
sage from trans-
mission CU
18044
Data bus drive
Missing mes-
sage from
Airbag CU
18050
Read out fault
memory of airbag
control unit
Edition 01.04
S00.5111.56.20
Possible cause of fault
-
♦ Manipulation attempt
♦ Start attempt with an
adapted ignition key
♦ Engine control unit not
adapted to immobiliser
control unit
♦ Short-circuit in communi-
cation cable
♦ Fault in the immobiliser
system
♦ Immobiliser control unit
defective/missing
♦ Engine control unit
wrongly coded
-
♦ Databus lines to auto-
matic transmission control
unit interrupted
♦ Fault in the system of the
automatic transmission
-
♦ Databus lines defective
♦ Fault in ABS system
-
♦ Fault in airbag system
Self-Diagnosis
Possible effects
♦ Engine starts and stops
immediately
♦ Poor driveability (jerking
when changing gears, load
alteration shock etc.)
♦ Incorrect driving behaviour
♦ Warning light for airbag
comes on
Rectifying fault
- Adapt engine control unit
to immobiliser
⇒ Binder: Electrical system;
Repair Group 90
- Check immobiliser
⇒ Binder: Electrical system;
Repair Group 90
- Code engine control unit
⇒ page 01-23
- Check data bus ⇒ page
23-55.3
- Check automatic transmis-
sion control unit
⇒ Binder: Automatic trans-
mission
- Check data bus ⇒ page
23-55.3
♦ Check airbag
⇒ Body Work; Repair Group
01
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01