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Removing and installing ignition coils with power output stages > < Testing secondary resistances

Fabia Mk1

Check ignition coils with power output stage (engines with engine identification characters BBY, BKY, BBZ, BUD)
Check ignition coils with power output stage (engines with engine identification characters BBY, BKY, BBZ, BUD)
Special tools and workshop equipment required
t  Test box -V.A.G 1598/31- or -V.A.G 1598/22-
t  Handheld multimeter, e.g. -V.A.G 1526 B-
t  Measuring tool set, e.g. -V.A.G 1594 C-
t  Diode test lamp, e.g. -V.A.G 1527-
t  Current flow diagram
Test sequence
  Note
Ignition coil and power output stage form a building unit.
Cylinder, which does not operate or misfire, determine as follows:
–  Test combustion misfiring → Chapter.
If a combustion misfiring was detected:
–  Proceed with test on cylinder determined as defective.
If no combustion misfiring was detected:
–  Successively remove contacts of the injectors while engine is running and monitor engine run,
or
–  Compare spark plugs of all cylinders and pay attention to contaminated (covered with soot) electrodes.
If a defective cylinder was determined:
–  Replace the spark plug of the defective cylinder with the one of another cylinder.
If the fault on this spark plug still exists:
–  Replace spark plug.
If the given cylinder is still defective:
–  Replace the ignition coil of the defective cylinder with the one of another cylinder.
If the fault on this ignition coil still exists:
–  Replace ignition coil.
If the given cylinder is still defective:
–  Disconnect the 4-pin plugs -1...4- at the ignition coils and check the wiring → Current flow diagrams and Fitting locations.
Checking voltage supply
–  Unplug the 4 pin plug connections from all ignition coils.
Test conditions
l  The fuses of the ignition system must be in proper order → Current flow diagrams and Fitting locations.
   
–  Measure the voltage supply beween contacts 1 + 3 and 2 + 3 of the removed plug using the multimeter and the adapter cables from the measuring tool set.
–  Switch on ignition.
Specified value: min. 11.5 V
–  Switch off ignition.
If no voltage is present:
  S24-0581
–  Check the cable between 4-pin plug contact 3 and the relay plate for interruption according to the Current Flow Diagram.
Cable resistance: max. 1.5 Ω
–  Check the cable between 4-pin plug contact 2 + earth and contact 1 + earth for interruption according to the Current Flow Diagram.
Cable resistance: max. 1.5 Ω
Test control
  WARNING
Caution! During the following test do not touch neither the connecting parts of the ignition coils nor the auxiliary cables.
  S24-0581
–  Unplug connector -arrows- of the injectors.
  S24-0576
–  Connect the diode test lamp V.A.G 1527 with adapter cables from V.A.G 1594 to contacts 3 + 4 of the removed plug.
–  Actuate the starter and check the ignition signal on the engine control unit.
The LED must light up.
–  Switch off ignition.
If the diode lights up and there is a voltage existing between contacts 3 + 4:
–  Replace ignition coil → Chapter.
If the LED does not light up:
–  Check wires.
Check wires.
  S24-0581
–  Connect the test box -V.A.G 1598/31- or -V.A.G 1598/22- to the wiring loom of the control unit. The engine control unit is not connected here.
  S24-0593
–  Check wiring between the test box and the 4-pin plug for interruption according to the current flow diagram → Current flow diagrams and Fitting locations.
Cable resistance: max. 1.5 Ω
–  Also check the wires for short-circuits.
Specified value: ∞ Ω
If no fault has been determined on the wiring and there is a voltage between contacts 2 + 3:
–  Replace engine control unit → Chapter.
  S24-0581

Removing and installing ignition coils with power output stages > < Testing secondary resistances