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Self-diagnosis II > < Test conditions

Octavia Mk1

Procedure
Procedure
–  Connect vehicle system tester -V.A.G 1552-. Start engine and select address word 01 “Engine electronics” → Chapter.
–  Enter function 03 “Final control diagnosis”.
   
Readout on display:
The valve must click.
  Note
The clicking of the valve cannot be heard because of the engine noise and can therefore only be checked.
If the valve does not click:
–  Testing Exhaust gas recirculation valve -N18 - → Chap. 23-1.
–  Press →.
  
Actuator diagnosis                    ->
Exhaust gas recirculation valve -N18
Readout on display:
This test step is also activated on vehicles without AC system.
Disregard display.
–  Press →.
  
Actuator diagnosis                    ->
AC compressor engagement
Readout on display:
The valve must click.
  Note
The clicking of the valve cannot be heard because of the engine noise and can therefore only be checked.
If the valve does not click:
–  Test charge pressure control solenoid valve -N75 - → Chap. 23-1.
–  Press →.
  
Actuator diagnosis                    ->
Charge press.control solenoid valve -N75
Readout on display:
The engine must stop.
If the engine does not stop:
–  Switch off ignition.
–  Inspecting Intake manifold flap change-over valve -N239- → Chap. 23-1.
–  Continue final control diagnosis with the engine off and the ignition switched on.
–  Press →.
  
Actuator diagnosis                    ->
Intake manif.flap change-over valve-N239
Readout on display:
The warning light for glow period must flash.
If the warning light does not flash:
–  Testing Glow period warning lamp - K29 - → Current Flow Diagrams, Electrical Fault Finding and Fitting Locations.
–  Press →.
  
Actuator diagnosis                    ->
Glow period warning lamp -K29
Readout on display:
The radiator fan must start running at 30 second intervals and stop.
If the fan does not run:
–  Testing radiator fan and radiator fan control unit -J293- → Current Flow Diagrams, Fault Finding Electrics and Fitting Locations.
–  Press →.
  
Actuator diagnosis                    ->
Radiator fan control
Readout on display:
The relay must click.
It is also possible to observe the relay switching on and off by the interior light becoming brighter and darker (caused by the high power consumption of glow plugs).
If the relay does not click:
–  Test glow plug relay -J52- → Current Flow Diagrams, Electrical Fault Finding and Fitting Locations.
–  Press →.
  
Actuator diagnosis                    ->
Glow plug relay -J52
Readout on display:
The relay must click.
If the relay does not click:
–  Test low heat output relay -J359- → Current Flow Diagrams, Electrical Fault Finding and Fitting Locations.
–  Press →.
  
Actuator diagnosis                    ->
Low heat output relay -J359
Readout on display:
The relay must click.
If the relay does not click:
–  Test high heat output relay -J360 - → Current Flow Diagrams, Electrical Fault Finding and Fitting Locations.
–  Press →.
  
Actuator diagnosis                    ->
High heat output relay          -J360
Readout on display:
The fault lamp must flash.
If the fault lamp does not flash:
–  Test fault lamp → Current Flow Diagrams, Electrical Fault Finding and Fitting Locations.
–  Press →.
  
Actuator diagnosis                    ->
Fault lamp
Readout on display:
–  Enter function 06 “End output” and confirm entry with Q.
  
Vehicle system test                 HELP
Select function XX

Self-diagnosis II > < Test conditions