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Pinking sensor: test > < Check voltage supply

Leon Mk2

Check the excitation
Check the excitation
  Caution
During the following test, do not touch the ignition coil terminals or the test cables.
   
–  Withdraw fuse number 8 from the fuse holder.
  N97-0078
–  Withdraw the 4 contact connector -arrow- from the ignition coils' final power stage.
  N15-0219
–  Attach the diode lamp -V.A.G. 1527- with auxiliary cables -V.A.G. 1594- to the Contacts 1 + 4 (ignition output 1) Contacts 3 + 4 (ignition output 2) of the removed connector
–  Operate the starter motor and check the engine control unit's ignition signal. The diode should blink.
–  Switch off the ignition.
If the diode blinks and there is voltage between contacts 2 + 4:
–  Renew the ignition transformer → Item.
If the diode does not blink:
  A24-0094
–  Attach the test box -V.A.G. 1598/22- to the control unit cabling harness.
  N24-0709
–  Check for a break in the cables between the test box and the 4 contact connector, following the wiring diagram. Contacts 1 + female socket 71 Contacts 3 + female socket 78 Cable resistance: 1.5 Ω max.
–  Also check whether the cables are shorted between each other. Theoretical value: ∞ Ω max.
If no fault is detected in the cables and there is voltage between contacts 2 + 4:
–  Renew the engine control unit → Chapter.
  A24-0094

Pinking sensor: test > < Check voltage supply