Skoda Octavia Workshop Manual page 34

01
Read out on display of V.A.G 1552
00518
Throttle valve potentiometer
-G69
1)
Signal outside tolerance
00529
Speed information missing
00532
Supply voltage
00545
Engine/gearbox electrical connec-
tion
Line interruption 3)
3)
Short-circuit to earth
1)
Petrol engines: The transmission of the signal is performed by the throttle valve control unit -J338 via the engine
control unit to the gearbox control unit. Therefore the fault memory of the engine control unit always has to be read
out if this fault occurs.
2) First check plug connections for contact corrosion or water penetration and replace if necessary.
3) One of these read-outs is displayed additionally for the related component.
Note for fault code 00529:
The engine speed signal is transmitted as a digital sig-
nal from the engine control unit to the gearbox control
unit.
------------ ------------
Self-Diagnosis/Electrical Test
Possible cause of fault
Throttle valve control unit -J338 de-
fective.
Engine control unit defective.
Line interruption between engine
control unit and gearbox control unit
-J217.
Engine speed is inaccurate because
of improper routing of electrical lines
(e.g. subsequent installation of a tel-
ephone).
Engine speed sender -G28 defec-
tive.
Engine control unit defective.
Short-circuit in dash panel insert.
Supply voltage defective.
Supply voltage for solenoid valves is
too low.
Line interruption or short-circuit
No connection of engine control unit/
gearbox control unit.
The signal for the ignition-timing ad-
justment is not or incorrectly trans-
mitted between the engine and the
gearbox control unit.
Note for fault code 00532:
Rectifying fault
- Check throttle valve control unit -J338, re-
place if necessary ⇒ Repair Group 01 and
24 of the relevant engine.
- After replacing throttle valve control unit put
system in basic setting ⇒ page 01-15.
- Check engine control unit, replace if neces-
sary ⇒ Repair Group 01 and 24 of the rel-
evant engine.
- After replacing throttle valve control unit put
system in basic setting ⇒ page 01-15.
- Check wiring and plug connections accord-
ing to the ⇒ Current Flow Diagrams, Electri-
cal Fault Finding and Fitting locations.
- Reading measured value block ⇒ page
01-16 Display group number 003.
- Check engine control unit, replace if neces-
sary ⇒ Repair Group 01 and 24 of the rel-
evant engine.
- Check supply voltage ⇒ Electrical System,
Repair Group 27; battery, voltage and load.
- Reading measured value block ⇒ page
01-16 Display group number 002.
- Check supply voltage to control unit -J217.
- Perform electrical test ⇒ page 01-29
- Check wiring and plug connections accord-
ing to the ⇒ Current Flow Diagrams, Electri-
cal Fault Finding and Fitting locations.
- Reading measured value block ⇒ page
01-16 Display group number 005.
- Check engine control unit, replace if neces-
sary ⇒ Repair Group 01 and 24 of the rel-
evant engine.
- Put system in basic setting ⇒ page 01-15
Condition for fault recognition: Supply voltage after
engine start is less than 8 volts.
OCTAVIA
2)
2)
Edition 06.03
S00.5116.60.20