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Erasing fault memory > < Interrogating fault memory

Octavia Mk1

Fault table
Fault table
  Note
t  As the control units are interlinked over two data Bus lines, start the fault finding by initiating the function 00 “automatic test sequence”. This allows to interrogate all the control units fitted on the vehicle to determine their possible faults.
t  Before replacing acomponent fault to be faulty test all corresponding plug connections, lines and earth connection according to the current flow diagram → Current flow diagrams and Fitting locations.
t  After repair always interrogate the fault memory using vehicle system tester -V.A.G 1552- and erase the memory. Then perform a test drive (at a speed above 20 km/h). After the test drive interrogate the fault memory again.
t  If -V.A.G 1552 -“Info. in literature” appears in the display of the vehicle system tester, look for the text required in the fault table under the fault code.
t  Below is a list of all possible faults detected by the four-wheel drive control unit -J492- and displayed on -V.A.G 1552 -, arranged according to their 5-digit fault code.
   
Readout on -V.A.G 1552-Possible cause of faultRectifying fault
No fault detected If after repair “No fault detected” is displayed, the self-diagnosis is completed.
If the Haldex coupling does not operate without fault in spite of display read-out “No fault detected”, proceed as follows:
1. Perform a test drive at a speed above 20 km/h.
2. Interrogate the fault memory again, if still “No fault detected” is stored.
3. Run through the Electrical Test completely → Chapter.
00453   
Function restriction due to overtemperature. 
t  mechanical fault of the Haldex coupling
–  Reading measured value block → Chapter, display group number 002.
–  Performing actuator diagnosis → Chapter.
–  Electrical test → Chapter, perform test step 5.
00526   
Brake light switch -F-
implausible signal
t  Line interruption or short-circuit to earth or positive between control unit -J492- and brake light switch -F-
t  Brake light switch -F- defective
–  Test wiring and plug connections according to current flow diagram.
–  Read measured value block → Chapter, display group number 001.
–  If necessary replace brake light switch -F- → Chassis → Rep. Gr.45.
00532   
Supply voltage
signal too low		 
t  Open circuit in wiring or short circuit to earth or to positive
–  Reading measured value block → Chapter, display group number 002.
–  Test wiring and plug connections according to current flow diagram.
  
t  Battery discharged
–  Recharge battery → Electrical System → Rep. Gr.27.
  
t  AC generator defective
–  Inspect AC generator → Current flow diagrams and Fitting locations.
00532   
Supply voltage
signal too high		 
t  Voltage regulator -C1- on generator defective
–  Reading measured value block → Chapter, display group number 002.
–  Inspect AC generator → Current flow diagrams and Fitting locations.
01043   
Control unit
wrong software version		 
t  wrong control unit fitted
–  Replace control unit -J492- → Chapter.
01155   
Clutch
mechanical fault		 
t  mechanical fault of the Haldex coupling
–  Performing actuator diagnosis → Chapter.
–  Electrical test → Chapter, perform test step 5.
01312   
Databus drive
defective
t  Fault in databus wiring
t  self-diagnostic control unit defective
–  Read measured value block → Chapter, display group number 125.
–  Electrical test → Chapter, perform test step 4.
–  Read fault memory of all control units connected to the data BUS and if necessary eliminate fault.
01314   
Engine control unit
no communication		 
t  Fault in databus wiring
t  incorrect or defective engine control unit
–  Read measured value block → Chapter, display group number 125.
–  Electrical test → Chapter, perform test step 4.
–  Interrogate the fault memory of the engine control unit and eliminate possible faults → relevant engine → Rep. Gr.01.
01314   
Interrogate fault memory of engine control unit
 
t  Fault entry in 4AV control unit
–  Interrogate the fault memory of the engine control unit and eliminate possible faults → relevant engine → Rep. Gr.01.
01316   
Brake control unit
no communication		 
t  Fault in databus wiring
t  wrong or defective control unit -J104-
–  Read measured value block → Chapter, display group number 125.
–  Electrical test → Chapter, perform test step 4.
–  Interrogate the fault memory of the engine control unit -J104- and eliminate possible faults → Chassis → Rep. Gr.45.
065535   
Control unit defective 
t  Four-wheel drive control unit -J492- defective
–  Replace control unit -J492- → Chapter.

   

Erasing fault memory > < Interrogating fault memory