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Basic setting > < Fault table: fault codes 00668...65535

A4 Mk1

Final control diagnosis
Final control diagnosis
  Note
t  During the final control diagnosis, individual control elements continue to be activated until the test programme is advanced to the next control element by pressing the → key.
t  The control elements can be checked either by listening for audible clicks, etc. or by touching the component.
t  If the final control diagnosis is to be repeated without first starting the engine briefly, switch off the ignition for approx. 20 seconds.
1. Glow plug relay -J52-
2. Glow period warning lamp -K29-
3. Blower relay -J323-
–  Connect vehicle diagnosis and service information system -VAS 5052- and select engine electronics control unit by entering “address word” 01. When doing this, the ignition must be switched on.
Checking glow plug relay -J52-:
   
Specification: The glow plug relay (mini central electrics, relay position 4) should click.
While the relay is being switched on and off, this can also be observed as the interior light becomes brighter and darker due to the current draw of the glow plugs.
If the glow plug relay does not click:
–  Check glow plug relay: → Current flow diagrams, Electrical fault finding and Fitting locations
Checking glow period warning lamp -K29-:
The warning lamp should flash.
If the warning lamp does not flash:
–  Check glow period warning lamp → Chapter
Checking blower relay -J323-:
The radiator fan should start running and stop again every 5 seconds.
  Note
t  The radiator fan may also be activated by the thermoswitch, automatic gearbox or air conditioner if the temperature reaches a certain level. When performing the final control diagnosis, make sure that the activation of the fan is not caused by this.
t  If necessary, allow the engine to cool down.
If the radiator fan is not activated:
–  Check radiator fan activation → Rep. Gr.19.
  A24-0100

Basic setting > < Fault table: fault codes 00668...65535