Skoda Octavia Workshop Manual page 29

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OCTAVIA
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♦ In view of the fact that the control units are interlinked
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with two data BUS lines, always initiate the ”automatic
test sequence” with the key function 0 and 0 at all the
control units fitted to the vehicle at the commencement
of fault finding. When this is done, the control units fit-
ted to the vehicle are interrogated and the possible faults
displayed.
♦ Before replacing any components displayed as faulty,
test all the appropriate plug connections, cables and
earth connections according to the current flow diagram.
Current Flow Diagrams, Electrical Fault Finding and
Fitting Locations binder
on V.A.G 1552
no fault recognized
00453
Restricted function as a result of
overtemperature
00526
Brake light switch -F
implausible signal
Edition 02.00
S00.5130.51.20
Self-Diagnosis/Electrical Test
1 ( 2 2 3 4 5 % 6 & ) 2 % 7 & ) 5 0
of
If ”no fault recognized” appears after completing repairs, self-diagnosis is ended.
If the Haldex coupling still does not operate properly although ”no fault recognized” is dis-
played, then proceed as described below:
1. Conduct a road test at a speed of more than 20 km/h.
2. Once again interrogate the fault memory. If no fault is still stored,
3. work through the Electrical Test complete
♦ Mechanical fault in the Haldex
coupling
♦ Open circuit in wiring or short cir-
cuit to earth or to positive between
control unit -J492- and brake light
switch -F-
♦ Brake light switch -F- faulty
♦ After completing repairs, always once again interro-
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gate the fault memory with the vehicle system tester
V.A.G 1552 and erase it. After this, carry out a road
test at a speed of more than 20 km/h. After the road
test, once again interrogate the fault memory.
♦ If ”see info in literature” appears in the display of the
vehicle system tester V.A.G 1552, look for the text re-
quired in the fault table on the basis of the fault code.
♦ All the possible faults which can be detected by the
four-wheel drive control unit -J492- and displayed on
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V.A.G 1552, are listed below according to the 5-digit
fault code.
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page 01-21.
- Read measured value block 002
- Perform final control diagnosis
- Perform electrical test
- Test wiring and plug connections according to
current flow diagram
- Read measured value block 001
- Replace brake light switch -F- if necessary
Running Gear; Repair Group 45; Electrical/
Electronic Components and Fitting Locations;
Removing and installing as well as setting
brake light switch
01
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page 01-18
page 01-16
page 01-21, test step 5
page 01-18
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