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Checking glow plugs > < Testing preheating system

Fabia Mk1

Check for proper operation
Check for proper operation
Special tools and workshop equipment required
t  Hand multimeter (e.g. -V.A.G 1526 A-)
t  Current flow diagram
Test conditions
l  Battery voltage at least 11.5 volts
l  Diesel direct injection system control unit -J248- O.K.
l  Fuses in fuse holder on battery O.K.
l  Automatic glow period control unit- J179- O.K.
Test sequence
–  Switch off ignition.
–  Remove engine cover.
   To do so pull the front and rear engine cover upwards with a sudden motion.
   
–  Disconnect plug -1- from Coolant temperature sender (-G62-) -2-.
  Note
By disconnecting the plug from the coolant temperature sender, engine condition “cold” is simulated and when the ignition is switched on a corresponding preheating process is performed.
–  Remove glow plug connectors from the glow plugs.
–  Connect Hand multimeter for voltage measurement to a glow plug connector and engine mass.
–  Switch on ignition. The approx. battery voltage must be displayed for approximately 20 seconds.
If no voltage is present:
–  If necessary eliminate wire interruption or short-circuit. → Current flow diagrams and Fitting locations.
During the simulated preheating process the glow period warning lamp -K29- must light up.
If the warning lamp does not light up:
–  Test glow period warning lamp - K29- → Current flow diagrams and Fitting locations.
  S23-0119

Checking glow plugs > < Testing preheating system